mirrors/SDL
1
0
Fork 0
mirror of https://github.com/libsdl-org/SDL.git synced 2025-10-05 09:26:25 +00:00
Code Issues Packages Projects Releases Wiki Activity

Fixed crash if initialization of EGL failed but was tried again later.

Browse Source 
The internal function SDL_EGL_LoadLibrary() did not delete and remove a mostly
uninitialized data structure if loading the library first failed. A later try to
use EGL then skipped initialization and assumed it was previously successful
because the data structure now already existed. This led to at least one crash
in the internal function SDL_EGL_ChooseConfig() because a NULL pointer was
dereferenced to make a call to eglBindAPI().
This commit is contained in:
Philipp Wiesemann
2015-06-21 17:33:46 +02:00
commit 0e45984fa0
1596 changed files with 468120 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

336
src/render/software/SDL_blendfillrect.c Normal file
View File

@@ -0,0 +1,336 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "SDL_draw.h"
#include "SDL_blendfillrect.h"
static int
SDL_BlendFillRect_RGB555(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB555);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB555);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB555);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB555);
break;
}
return 0;
}
static int
SDL_BlendFillRect_RGB565(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB565);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB565);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB565);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB565);
break;
}
return 0;
}
static int
SDL_BlendFillRect_RGB888(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB888);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB888);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB888);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGB888);
break;
}
return 0;
}
static int
SDL_BlendFillRect_ARGB8888(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_ARGB8888);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_ARGB8888);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_ARGB8888);
break;
}
return 0;
}
static int
SDL_BlendFillRect_RGB(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 2:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint16, DRAW_SETPIXEL_BLEND_RGB);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint16, DRAW_SETPIXEL_ADD_RGB);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint16, DRAW_SETPIXEL_MOD_RGB);
break;
default:
FILLRECT(Uint16, DRAW_SETPIXEL_RGB);
break;
}
return 0;
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGB);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGB);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGB);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGB);
break;
}
return 0;
default:
return SDL_Unsupported();
}
}
static int
SDL_BlendFillRect_RGBA(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
FILLRECT(Uint32, DRAW_SETPIXEL_BLEND_RGBA);
break;
case SDL_BLENDMODE_ADD:
FILLRECT(Uint32, DRAW_SETPIXEL_ADD_RGBA);
break;
case SDL_BLENDMODE_MOD:
FILLRECT(Uint32, DRAW_SETPIXEL_MOD_RGBA);
break;
default:
FILLRECT(Uint32, DRAW_SETPIXEL_RGBA);
break;
}
return 0;
default:
return SDL_Unsupported();
}
}
int
SDL_BlendFillRect(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_Rect clipped;
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_BlendFillRect(): Unsupported surface format");
}
/* If 'rect' == NULL, then fill the whole surface */
if (rect) {
/* Perform clipping */
if (!SDL_IntersectRect(rect, &dst->clip_rect, &clipped)) {
return 0;
}
rect = &clipped;
} else {
rect = &dst->clip_rect;
}
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
switch (dst->format->BitsPerPixel) {
case 15:
switch (dst->format->Rmask) {
case 0x7C00:
return SDL_BlendFillRect_RGB555(dst, rect, blendMode, r, g, b, a);
}
break;
case 16:
switch (dst->format->Rmask) {
case 0xF800:
return SDL_BlendFillRect_RGB565(dst, rect, blendMode, r, g, b, a);
}
break;
case 32:
switch (dst->format->Rmask) {
case 0x00FF0000:
if (!dst->format->Amask) {
return SDL_BlendFillRect_RGB888(dst, rect, blendMode, r, g, b, a);
} else {
return SDL_BlendFillRect_ARGB8888(dst, rect, blendMode, r, g, b, a);
}
break;
}
break;
default:
break;
}
if (!dst->format->Amask) {
return SDL_BlendFillRect_RGB(dst, rect, blendMode, r, g, b, a);
} else {
return SDL_BlendFillRect_RGBA(dst, rect, blendMode, r, g, b, a);
}
}
int
SDL_BlendFillRects(SDL_Surface * dst, const SDL_Rect * rects, int count,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
SDL_Rect rect;
int i;
int (*func)(SDL_Surface * dst, const SDL_Rect * rect,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
int status = 0;
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_BlendFillRects(): Unsupported surface format");
}
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
/* FIXME: Does this function pointer slow things down significantly? */
switch (dst->format->BitsPerPixel) {
case 15:
switch (dst->format->Rmask) {
case 0x7C00:
func = SDL_BlendFillRect_RGB555;
}
break;
case 16:
switch (dst->format->Rmask) {
case 0xF800:
func = SDL_BlendFillRect_RGB565;
}
break;
case 32:
switch (dst->format->Rmask) {
case 0x00FF0000:
if (!dst->format->Amask) {
func = SDL_BlendFillRect_RGB888;
} else {
func = SDL_BlendFillRect_ARGB8888;
}
break;
}
break;
default:
break;
}
if (!func) {
if (!dst->format->Amask) {
func = SDL_BlendFillRect_RGB;
} else {
func = SDL_BlendFillRect_RGBA;
}
}
for (i = 0; i < count; ++i) {
/* Perform clipping */
if (!SDL_IntersectRect(&rects[i], &dst->clip_rect, &rect)) {
continue;
}
status = func(dst, &rect, blendMode, r, g, b, a);
}
return status;
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

27
src/render/software/SDL_blendfillrect.h Normal file
View File

@@ -0,0 +1,27 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
extern int SDL_BlendFillRect(SDL_Surface * dst, const SDL_Rect * rect, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
extern int SDL_BlendFillRects(SDL_Surface * dst, const SDL_Rect * rects, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* vi: set ts=4 sw=4 expandtab: */

777
src/render/software/SDL_blendline.c Normal file
View File

@@ -0,0 +1,777 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "SDL_draw.h"
#include "SDL_blendline.h"
#include "SDL_blendpoint.h"
static void
SDL_BlendLine_RGB2(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
HLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
VLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
DLINE(Uint16, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_BLEND_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_ADD_RGB, DRAW_SETPIXELXY2_ADD_RGB,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_MOD_RGB, DRAW_SETPIXELXY2_MOD_RGB,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY2_RGB, DRAW_SETPIXELXY2_BLEND_RGB,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_RGB555(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
default:
HLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
default:
VLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB555, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB555, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB555, draw_end);
break;
default:
DLINE(Uint16, DRAW_SETPIXEL_RGB555, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_BLEND_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_ADD_RGB555, DRAW_SETPIXELXY_ADD_RGB555,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB555, DRAW_SETPIXELXY_MOD_RGB555,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB555, DRAW_SETPIXELXY_BLEND_RGB555,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_RGB565(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
default:
HLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
default:
VLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint16, DRAW_SETPIXEL_BLEND_RGB565, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint16, DRAW_SETPIXEL_ADD_RGB565, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint16, DRAW_SETPIXEL_MOD_RGB565, draw_end);
break;
default:
DLINE(Uint16, DRAW_SETPIXEL_RGB565, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_BLEND_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_ADD_RGB565, DRAW_SETPIXELXY_ADD_RGB565,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB565, DRAW_SETPIXELXY_MOD_RGB565,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB565, DRAW_SETPIXELXY_BLEND_RGB565,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_RGB4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
HLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
VLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB, draw_end);
break;
default:
DLINE(Uint32, DRAW_SETPIXEL_RGB, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_BLEND_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_ADD_RGB, DRAW_SETPIXELXY4_ADD_RGB,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_MOD_RGB, DRAW_SETPIXELXY4_MOD_RGB,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_RGB, DRAW_SETPIXELXY4_BLEND_RGB,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_RGBA4(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
const SDL_PixelFormat *fmt = dst->format;
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
default:
HLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
default:
VLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGBA, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint32, DRAW_SETPIXEL_ADD_RGBA, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGBA, draw_end);
break;
default:
DLINE(Uint32, DRAW_SETPIXEL_RGBA, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_BLEND_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_ADD_RGBA, DRAW_SETPIXELXY4_ADD_RGBA,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_MOD_RGBA, DRAW_SETPIXELXY4_MOD_RGBA,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY4_RGBA, DRAW_SETPIXELXY4_BLEND_RGBA,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_RGB888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
default:
HLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
default:
VLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint32, DRAW_SETPIXEL_BLEND_RGB888, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint32, DRAW_SETPIXEL_ADD_RGB888, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_RGB888, draw_end);
break;
default:
DLINE(Uint32, DRAW_SETPIXEL_RGB888, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_BLEND_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_ADD_RGB888, DRAW_SETPIXELXY_ADD_RGB888,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_RGB888, DRAW_SETPIXELXY_MOD_RGB888,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_RGB888, DRAW_SETPIXELXY_BLEND_RGB888,
draw_end);
break;
}
}
}
static void
SDL_BlendLine_ARGB8888(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 _r, Uint8 _g, Uint8 _b, Uint8 _a,
SDL_bool draw_end)
{
unsigned r, g, b, a, inva;
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(_r, _a);
g = DRAW_MUL(_g, _a);
b = DRAW_MUL(_b, _a);
a = _a;
} else {
r = _r;
g = _g;
b = _b;
a = _a;
}
inva = (a ^ 0xff);
if (y1 == y2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
HLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_ADD:
HLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_MOD:
HLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
default:
HLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
break;
}
} else if (x1 == x2) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
VLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_ADD:
VLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_MOD:
VLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
default:
VLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
break;
}
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DLINE(Uint32, DRAW_SETPIXEL_BLEND_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_ADD:
DLINE(Uint32, DRAW_SETPIXEL_ADD_ARGB8888, draw_end);
break;
case SDL_BLENDMODE_MOD:
DLINE(Uint32, DRAW_SETPIXEL_MOD_ARGB8888, draw_end);
break;
default:
DLINE(Uint32, DRAW_SETPIXEL_ARGB8888, draw_end);
break;
}
} else {
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_BLEND_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
draw_end);
break;
case SDL_BLENDMODE_ADD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_ADD_ARGB8888, DRAW_SETPIXELXY_ADD_ARGB8888,
draw_end);
break;
case SDL_BLENDMODE_MOD:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_MOD_ARGB8888, DRAW_SETPIXELXY_MOD_ARGB8888,
draw_end);
break;
default:
AALINE(x1, y1, x2, y2,
DRAW_SETPIXELXY_ARGB8888, DRAW_SETPIXELXY_BLEND_ARGB8888,
draw_end);
break;
}
}
}
typedef void (*BlendLineFunc) (SDL_Surface * dst,
int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a,
SDL_bool draw_end);
static BlendLineFunc
SDL_CalculateBlendLineFunc(const SDL_PixelFormat * fmt)
{
switch (fmt->BytesPerPixel) {
case 2:
if (fmt->Rmask == 0x7C00) {
return SDL_BlendLine_RGB555;
} else if (fmt->Rmask == 0xF800) {
return SDL_BlendLine_RGB565;
} else {
return SDL_BlendLine_RGB2;
}
break;
case 4:
if (fmt->Rmask == 0x00FF0000) {
if (fmt->Amask) {
return SDL_BlendLine_ARGB8888;
} else {
return SDL_BlendLine_RGB888;
}
} else {
if (fmt->Amask) {
return SDL_BlendLine_RGBA4;
} else {
return SDL_BlendLine_RGB4;
}
}
}
return NULL;
}
int
SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
BlendLineFunc func;
if (!dst) {
return SDL_SetError("SDL_BlendLine(): Passed NULL destination surface");
}
func = SDL_CalculateBlendLineFunc(dst->format);
if (!func) {
return SDL_SetError("SDL_BlendLine(): Unsupported surface format");
}
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
return 0;
}
func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, SDL_TRUE);
return 0;
}
int
SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
int i;
int x1, y1;
int x2, y2;
SDL_bool draw_end;
BlendLineFunc func;
if (!dst) {
return SDL_SetError("SDL_BlendLines(): Passed NULL destination surface");
}
func = SDL_CalculateBlendLineFunc(dst->format);
if (!func) {
return SDL_SetError("SDL_BlendLines(): Unsupported surface format");
}
for (i = 1; i < count; ++i) {
x1 = points[i-1].x;
y1 = points[i-1].y;
x2 = points[i].x;
y2 = points[i].y;
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
continue;
}
/* Draw the end if it was clipped */
draw_end = (x2 != points[i].x || y2 != points[i].y);
func(dst, x1, y1, x2, y2, blendMode, r, g, b, a, draw_end);
}
if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
SDL_BlendPoint(dst, points[count-1].x, points[count-1].y,
blendMode, r, g, b, a);
}
return 0;
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

27
src/render/software/SDL_blendline.h Normal file
View File

@@ -0,0 +1,27 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
extern int SDL_BlendLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
extern int SDL_BlendLines(SDL_Surface * dst, const SDL_Point * points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* vi: set ts=4 sw=4 expandtab: */

343
src/render/software/SDL_blendpoint.c Normal file
View File

@@ -0,0 +1,343 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "SDL_draw.h"
#include "SDL_blendpoint.h"
static int
SDL_BlendPoint_RGB555(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB555(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB555(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB555(x, y);
break;
default:
DRAW_SETPIXELXY_RGB555(x, y);
break;
}
return 0;
}
static int
SDL_BlendPoint_RGB565(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB565(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB565(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB565(x, y);
break;
default:
DRAW_SETPIXELXY_RGB565(x, y);
break;
}
return 0;
}
static int
SDL_BlendPoint_RGB888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_RGB888(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_RGB888(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_RGB888(x, y);
break;
default:
DRAW_SETPIXELXY_RGB888(x, y);
break;
}
return 0;
}
static int
SDL_BlendPoint_ARGB8888(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode,
Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
unsigned inva = 0xff - a;
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY_BLEND_ARGB8888(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY_ADD_ARGB8888(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY_MOD_ARGB8888(x, y);
break;
default:
DRAW_SETPIXELXY_ARGB8888(x, y);
break;
}
return 0;
}
static int
SDL_BlendPoint_RGB(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 2:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY2_BLEND_RGB(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY2_ADD_RGB(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY2_MOD_RGB(x, y);
break;
default:
DRAW_SETPIXELXY2_RGB(x, y);
break;
}
return 0;
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY4_BLEND_RGB(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY4_ADD_RGB(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGB(x, y);
break;
default:
DRAW_SETPIXELXY4_RGB(x, y);
break;
}
return 0;
default:
return SDL_Unsupported();
}
}
static int
SDL_BlendPoint_RGBA(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
SDL_PixelFormat *fmt = dst->format;
unsigned inva = 0xff - a;
switch (fmt->BytesPerPixel) {
case 4:
switch (blendMode) {
case SDL_BLENDMODE_BLEND:
DRAW_SETPIXELXY4_BLEND_RGBA(x, y);
break;
case SDL_BLENDMODE_ADD:
DRAW_SETPIXELXY4_ADD_RGBA(x, y);
break;
case SDL_BLENDMODE_MOD:
DRAW_SETPIXELXY4_MOD_RGBA(x, y);
break;
default:
DRAW_SETPIXELXY4_RGBA(x, y);
break;
}
return 0;
default:
return SDL_Unsupported();
}
}
int
SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r,
Uint8 g, Uint8 b, Uint8 a)
{
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_BlendPoint(): Unsupported surface format");
}
/* Perform clipping */
if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
x >= (dst->clip_rect.x + dst->clip_rect.w) ||
y >= (dst->clip_rect.y + dst->clip_rect.h)) {
return 0;
}
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
switch (dst->format->BitsPerPixel) {
case 15:
switch (dst->format->Rmask) {
case 0x7C00:
return SDL_BlendPoint_RGB555(dst, x, y, blendMode, r, g, b, a);
}
break;
case 16:
switch (dst->format->Rmask) {
case 0xF800:
return SDL_BlendPoint_RGB565(dst, x, y, blendMode, r, g, b, a);
}
break;
case 32:
switch (dst->format->Rmask) {
case 0x00FF0000:
if (!dst->format->Amask) {
return SDL_BlendPoint_RGB888(dst, x, y, blendMode, r, g, b,
a);
} else {
return SDL_BlendPoint_ARGB8888(dst, x, y, blendMode, r, g, b,
a);
}
break;
}
break;
default:
break;
}
if (!dst->format->Amask) {
return SDL_BlendPoint_RGB(dst, x, y, blendMode, r, g, b, a);
} else {
return SDL_BlendPoint_RGBA(dst, x, y, blendMode, r, g, b, a);
}
}
int
SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a)
{
int minx, miny;
int maxx, maxy;
int i;
int x, y;
int (*func)(SDL_Surface * dst, int x, int y,
SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a) = NULL;
int status = 0;
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_BlendPoints(): Unsupported surface format");
}
if (blendMode == SDL_BLENDMODE_BLEND || blendMode == SDL_BLENDMODE_ADD) {
r = DRAW_MUL(r, a);
g = DRAW_MUL(g, a);
b = DRAW_MUL(b, a);
}
/* FIXME: Does this function pointer slow things down significantly? */
switch (dst->format->BitsPerPixel) {
case 15:
switch (dst->format->Rmask) {
case 0x7C00:
func = SDL_BlendPoint_RGB555;
break;
}
break;
case 16:
switch (dst->format->Rmask) {
case 0xF800:
func = SDL_BlendPoint_RGB565;
break;
}
break;
case 32:
switch (dst->format->Rmask) {
case 0x00FF0000:
if (!dst->format->Amask) {
func = SDL_BlendPoint_RGB888;
} else {
func = SDL_BlendPoint_ARGB8888;
}
break;
}
break;
default:
break;
}
if (!func) {
if (!dst->format->Amask) {
func = SDL_BlendPoint_RGB;
} else {
func = SDL_BlendPoint_RGBA;
}
}
minx = dst->clip_rect.x;
maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
miny = dst->clip_rect.y;
maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
for (i = 0; i < count; ++i) {
x = points[i].x;
y = points[i].y;
if (x < minx || x > maxx || y < miny || y > maxy) {
continue;
}
status = func(dst, x, y, blendMode, r, g, b, a);
}
return status;
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

27
src/render/software/SDL_blendpoint.h Normal file
View File

@@ -0,0 +1,27 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
extern int SDL_BlendPoint(SDL_Surface * dst, int x, int y, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
extern int SDL_BlendPoints(SDL_Surface * dst, const SDL_Point * points, int count, SDL_BlendMode blendMode, Uint8 r, Uint8 g, Uint8 b, Uint8 a);
/* vi: set ts=4 sw=4 expandtab: */

576
src/render/software/SDL_draw.h Normal file
View File

@@ -0,0 +1,576 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#include "../../video/SDL_blit.h"
/* This code assumes that r, g, b, a are the source color,
* and in the blend and add case, the RGB values are premultiplied by a.
*/
#define DRAW_MUL(_a, _b) (((unsigned)(_a)*(_b))/255)
#define DRAW_FASTSETPIXEL(type) \
*pixel = (type) color
#define DRAW_FASTSETPIXEL1 DRAW_FASTSETPIXEL(Uint8)
#define DRAW_FASTSETPIXEL2 DRAW_FASTSETPIXEL(Uint16)
#define DRAW_FASTSETPIXEL4 DRAW_FASTSETPIXEL(Uint32)
#define DRAW_FASTSETPIXELXY(x, y, type, bpp, color) \
*(type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
+ (x) * bpp) = (type) color
#define DRAW_FASTSETPIXELXY1(x, y) DRAW_FASTSETPIXELXY(x, y, Uint8, 1, color)
#define DRAW_FASTSETPIXELXY2(x, y) DRAW_FASTSETPIXELXY(x, y, Uint16, 2, color)
#define DRAW_FASTSETPIXELXY4(x, y) DRAW_FASTSETPIXELXY(x, y, Uint32, 4, color)
#define DRAW_SETPIXEL(setpixel) \
do { \
unsigned sr = r, sg = g, sb = b, sa = a; (void) sa; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_BLEND(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa = 0xFF; \
getpixel; \
sr = DRAW_MUL(inva, sr) + r; \
sg = DRAW_MUL(inva, sg) + g; \
sb = DRAW_MUL(inva, sb) + b; \
sa = DRAW_MUL(inva, sa) + a; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_ADD(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa; (void) sa; \
getpixel; \
sr += r; if (sr > 0xff) sr = 0xff; \
sg += g; if (sg > 0xff) sg = 0xff; \
sb += b; if (sb > 0xff) sb = 0xff; \
setpixel; \
} while (0)
#define DRAW_SETPIXEL_MOD(getpixel, setpixel) \
do { \
unsigned sr, sg, sb, sa; (void) sa; \
getpixel; \
sr = DRAW_MUL(sr, r); \
sg = DRAW_MUL(sg, g); \
sb = DRAW_MUL(sb, b); \
setpixel; \
} while (0)
#define DRAW_SETPIXELXY(x, y, type, bpp, op) \
do { \
type *pixel = (type *)((Uint8 *)dst->pixels + (y) * dst->pitch \
+ (x) * bpp); \
op; \
} while (0)
/*
* Define draw operators for RGB555
*/
#define DRAW_SETPIXEL_RGB555 \
DRAW_SETPIXEL(RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB555 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB555 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB555 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB555(*pixel, sr, sg, sb), \
RGB555_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB555)
#define DRAW_SETPIXELXY_BLEND_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB555)
#define DRAW_SETPIXELXY_ADD_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB555)
#define DRAW_SETPIXELXY_MOD_RGB555(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB555)
/*
* Define draw operators for RGB565
*/
#define DRAW_SETPIXEL_RGB565 \
DRAW_SETPIXEL(RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB565 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB565 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB565 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB565(*pixel, sr, sg, sb), \
RGB565_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB565)
#define DRAW_SETPIXELXY_BLEND_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB565)
#define DRAW_SETPIXELXY_ADD_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB565)
#define DRAW_SETPIXELXY_MOD_RGB565(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB565)
/*
* Define draw operators for RGB888
*/
#define DRAW_SETPIXEL_RGB888 \
DRAW_SETPIXEL(RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB888 \
DRAW_SETPIXEL_BLEND(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB888 \
DRAW_SETPIXEL_ADD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB888 \
DRAW_SETPIXEL_MOD(RGB_FROM_RGB888(*pixel, sr, sg, sb), \
RGB888_FROM_RGB(*pixel, sr, sg, sb))
#define DRAW_SETPIXELXY_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB888)
#define DRAW_SETPIXELXY_BLEND_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB888)
#define DRAW_SETPIXELXY_ADD_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB888)
#define DRAW_SETPIXELXY_MOD_RGB888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB888)
/*
* Define draw operators for ARGB8888
*/
#define DRAW_SETPIXEL_ARGB8888 \
DRAW_SETPIXEL(ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_BLEND_ARGB8888 \
DRAW_SETPIXEL_BLEND(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_ADD_ARGB8888 \
DRAW_SETPIXEL_ADD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXEL_MOD_ARGB8888 \
DRAW_SETPIXEL_MOD(RGBA_FROM_ARGB8888(*pixel, sr, sg, sb, sa), \
ARGB8888_FROM_RGBA(*pixel, sr, sg, sb, sa))
#define DRAW_SETPIXELXY_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ARGB8888)
#define DRAW_SETPIXELXY_BLEND_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_ARGB8888)
#define DRAW_SETPIXELXY_ADD_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_ARGB8888)
#define DRAW_SETPIXELXY_MOD_ARGB8888(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_ARGB8888)
/*
* Define draw operators for general RGB
*/
#define DRAW_SETPIXEL_RGB \
DRAW_SETPIXEL(PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_BLEND_RGB \
DRAW_SETPIXEL_BLEND(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_ADD_RGB \
DRAW_SETPIXEL_ADD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXEL_MOD_RGB \
DRAW_SETPIXEL_MOD(RGB_FROM_PIXEL(*pixel, fmt, sr, sg, sb), \
PIXEL_FROM_RGB(*pixel, fmt, sr, sg, sb))
#define DRAW_SETPIXELXY2_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_RGB)
#define DRAW_SETPIXELXY4_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGB)
#define DRAW_SETPIXELXY2_BLEND_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_BLEND_RGB)
#define DRAW_SETPIXELXY4_BLEND_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGB)
#define DRAW_SETPIXELXY2_ADD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_ADD_RGB)
#define DRAW_SETPIXELXY4_ADD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGB)
#define DRAW_SETPIXELXY2_MOD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint16, 2, DRAW_SETPIXEL_MOD_RGB)
#define DRAW_SETPIXELXY4_MOD_RGB(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGB)
/*
* Define draw operators for general RGBA
*/
#define DRAW_SETPIXEL_RGBA \
DRAW_SETPIXEL(PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_BLEND_RGBA \
DRAW_SETPIXEL_BLEND(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_ADD_RGBA \
DRAW_SETPIXEL_ADD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXEL_MOD_RGBA \
DRAW_SETPIXEL_MOD(RGBA_FROM_PIXEL(*pixel, fmt, sr, sg, sb, sa), \
PIXEL_FROM_RGBA(*pixel, fmt, sr, sg, sb, sa))
#define DRAW_SETPIXELXY4_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_RGBA)
#define DRAW_SETPIXELXY4_BLEND_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_BLEND_RGBA)
#define DRAW_SETPIXELXY4_ADD_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_ADD_RGBA)
#define DRAW_SETPIXELXY4_MOD_RGBA(x, y) \
DRAW_SETPIXELXY(x, y, Uint32, 4, DRAW_SETPIXEL_MOD_RGBA)
/*
* Define line drawing macro
*/
#define ABS(_x) ((_x) < 0 ? -(_x) : (_x))
/* Horizontal line */
#define HLINE(type, op, draw_end) \
{ \
int length; \
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
type *pixel; \
if (x1 <= x2) { \
pixel = (type *)dst->pixels + y1 * pitch + x1; \
length = draw_end ? (x2-x1+1) : (x2-x1); \
} else { \
pixel = (type *)dst->pixels + y1 * pitch + x2; \
if (!draw_end) { \
++pixel; \
} \
length = draw_end ? (x1-x2+1) : (x1-x2); \
} \
while (length--) { \
op; \
++pixel; \
} \
}
/* Vertical line */
#define VLINE(type, op, draw_end) \
{ \
int length; \
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
type *pixel; \
if (y1 <= y2) { \
pixel = (type *)dst->pixels + y1 * pitch + x1; \
length = draw_end ? (y2-y1+1) : (y2-y1); \
} else { \
pixel = (type *)dst->pixels + y2 * pitch + x1; \
if (!draw_end) { \
pixel += pitch; \
} \
length = draw_end ? (y1-y2+1) : (y1-y2); \
} \
while (length--) { \
op; \
pixel += pitch; \
} \
}
/* Diagonal line */
#define DLINE(type, op, draw_end) \
{ \
int length; \
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
type *pixel; \
if (y1 <= y2) { \
pixel = (type *)dst->pixels + y1 * pitch + x1; \
if (x1 <= x2) { \
++pitch; \
} else { \
--pitch; \
} \
length = (y2-y1); \
} else { \
pixel = (type *)dst->pixels + y2 * pitch + x2; \
if (x2 <= x1) { \
++pitch; \
} else { \
--pitch; \
} \
if (!draw_end) { \
pixel += pitch; \
} \
length = (y1-y2); \
} \
if (draw_end) { \
++length; \
} \
while (length--) { \
op; \
pixel += pitch; \
} \
}
/* Bresenham's line algorithm */
#define BLINE(x1, y1, x2, y2, op, draw_end) \
{ \
int i, deltax, deltay, numpixels; \
int d, dinc1, dinc2; \
int x, xinc1, xinc2; \
int y, yinc1, yinc2; \
\
deltax = ABS(x2 - x1); \
deltay = ABS(y2 - y1); \
\
if (deltax >= deltay) { \
numpixels = deltax + 1; \
d = (2 * deltay) - deltax; \
dinc1 = deltay * 2; \
dinc2 = (deltay - deltax) * 2; \
xinc1 = 1; \
xinc2 = 1; \
yinc1 = 0; \
yinc2 = 1; \
} else { \
numpixels = deltay + 1; \
d = (2 * deltax) - deltay; \
dinc1 = deltax * 2; \
dinc2 = (deltax - deltay) * 2; \
xinc1 = 0; \
xinc2 = 1; \
yinc1 = 1; \
yinc2 = 1; \
} \
\
if (x1 > x2) { \
xinc1 = -xinc1; \
xinc2 = -xinc2; \
} \
if (y1 > y2) { \
yinc1 = -yinc1; \
yinc2 = -yinc2; \
} \
\
x = x1; \
y = y1; \
\
if (!draw_end) { \
--numpixels; \
} \
for (i = 0; i < numpixels; ++i) { \
op(x, y); \
if (d < 0) { \
d += dinc1; \
x += xinc1; \
y += yinc1; \
} else { \
d += dinc2; \
x += xinc2; \
y += yinc2; \
} \
} \
}
/* Xiaolin Wu's line algorithm, based on Michael Abrash's implementation */
#define WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
{ \
Uint16 ErrorAdj, ErrorAcc; \
Uint16 ErrorAccTemp, Weighting; \
int DeltaX, DeltaY, Temp, XDir; \
unsigned r, g, b, a, inva; \
\
/* Draw the initial pixel, which is always exactly intersected by \
the line and so needs no weighting */ \
opaque_op(x1, y1); \
\
/* Draw the final pixel, which is always exactly intersected by the line \
and so needs no weighting */ \
if (draw_end) { \
opaque_op(x2, y2); \
} \
\
/* Make sure the line runs top to bottom */ \
if (y1 > y2) { \
Temp = y1; y1 = y2; y2 = Temp; \
Temp = x1; x1 = x2; x2 = Temp; \
} \
DeltaY = y2 - y1; \
\
if ((DeltaX = x2 - x1) >= 0) { \
XDir = 1; \
} else { \
XDir = -1; \
DeltaX = -DeltaX; /* make DeltaX positive */ \
} \
\
/* line is not horizontal, diagonal, or vertical */ \
ErrorAcc = 0; /* initialize the line error accumulator to 0 */ \
\
/* Is this an X-major or Y-major line? */ \
if (DeltaY > DeltaX) { \
/* Y-major line; calculate 16-bit fixed-point fractional part of a \
pixel that X advances each time Y advances 1 pixel, truncating the \
result so that we won't overrun the endpoint along the X axis */ \
ErrorAdj = ((unsigned long) DeltaX << 16) / (unsigned long) DeltaY; \
/* Draw all pixels other than the first and last */ \
while (--DeltaY) { \
ErrorAccTemp = ErrorAcc; /* remember currrent accumulated error */ \
ErrorAcc += ErrorAdj; /* calculate error for next pixel */ \
if (ErrorAcc <= ErrorAccTemp) { \
/* The error accumulator turned over, so advance the X coord */ \
x1 += XDir; \
} \
y1++; /* Y-major, so always advance Y */ \
/* The IntensityBits most significant bits of ErrorAcc give us the \
intensity weighting for this pixel, and the complement of the \
weighting for the paired pixel */ \
Weighting = ErrorAcc >> 8; \
{ \
a = DRAW_MUL(_a, (Weighting ^ 255)); \
r = DRAW_MUL(_r, a); \
g = DRAW_MUL(_g, a); \
b = DRAW_MUL(_b, a); \
inva = (a ^ 0xFF); \
blend_op(x1, y1); \
} \
{ \
a = DRAW_MUL(_a, Weighting); \
r = DRAW_MUL(_r, a); \
g = DRAW_MUL(_g, a); \
b = DRAW_MUL(_b, a); \
inva = (a ^ 0xFF); \
blend_op(x1 + XDir, y1); \
} \
} \
} else { \
/* X-major line; calculate 16-bit fixed-point fractional part of a \
pixel that Y advances each time X advances 1 pixel, truncating the \
result to avoid overrunning the endpoint along the X axis */ \
ErrorAdj = ((unsigned long) DeltaY << 16) / (unsigned long) DeltaX; \
/* Draw all pixels other than the first and last */ \
while (--DeltaX) { \
ErrorAccTemp = ErrorAcc; /* remember currrent accumulated error */ \
ErrorAcc += ErrorAdj; /* calculate error for next pixel */ \
if (ErrorAcc <= ErrorAccTemp) { \
/* The error accumulator turned over, so advance the Y coord */ \
y1++; \
} \
x1 += XDir; /* X-major, so always advance X */ \
/* The IntensityBits most significant bits of ErrorAcc give us the \
intensity weighting for this pixel, and the complement of the \
weighting for the paired pixel */ \
Weighting = ErrorAcc >> 8; \
{ \
a = DRAW_MUL(_a, (Weighting ^ 255)); \
r = DRAW_MUL(_r, a); \
g = DRAW_MUL(_g, a); \
b = DRAW_MUL(_b, a); \
inva = (a ^ 0xFF); \
blend_op(x1, y1); \
} \
{ \
a = DRAW_MUL(_a, Weighting); \
r = DRAW_MUL(_r, a); \
g = DRAW_MUL(_g, a); \
b = DRAW_MUL(_b, a); \
inva = (a ^ 0xFF); \
blend_op(x1, y1 + 1); \
} \
} \
} \
}
#ifdef AA_LINES
#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
WULINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end)
#else
#define AALINE(x1, y1, x2, y2, opaque_op, blend_op, draw_end) \
BLINE(x1, y1, x2, y2, opaque_op, draw_end)
#endif
/*
* Define fill rect macro
*/
#define FILLRECT(type, op) \
do { \
int width = rect->w; \
int height = rect->h; \
int pitch = (dst->pitch / dst->format->BytesPerPixel); \
int skip = pitch - width; \
type *pixel = (type *)dst->pixels + rect->y * pitch + rect->x; \
while (height--) { \
{ int n = (width+3)/4; \
switch (width & 3) { \
case 0: do { op; pixel++; \
case 3: op; pixel++; \
case 2: op; pixel++; \
case 1: op; pixel++; \
} while ( --n > 0 ); \
} \
} \
pixel += skip; \
} \
} while (0)
/* vi: set ts=4 sw=4 expandtab: */

209
src/render/software/SDL_drawline.c Normal file
View File

@@ -0,0 +1,209 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "SDL_draw.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
static void
SDL_DrawLine1(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
SDL_bool draw_end)
{
if (y1 == y2) {
int length;
int pitch = (dst->pitch / dst->format->BytesPerPixel);
Uint8 *pixel;
if (x1 <= x2) {
pixel = (Uint8 *)dst->pixels + y1 * pitch + x1;
length = draw_end ? (x2-x1+1) : (x2-x1);
} else {
pixel = (Uint8 *)dst->pixels + y1 * pitch + x2;
if (!draw_end) {
++pixel;
}
length = draw_end ? (x1-x2+1) : (x1-x2);
}
SDL_memset(pixel, color, length);
} else if (x1 == x2) {
VLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
DLINE(Uint8, DRAW_FASTSETPIXEL1, draw_end);
} else {
BLINE(x1, y1, x2, y2, DRAW_FASTSETPIXELXY1, draw_end);
}
}
static void
SDL_DrawLine2(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
SDL_bool draw_end)
{
if (y1 == y2) {
HLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
} else if (x1 == x2) {
VLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
DLINE(Uint16, DRAW_FASTSETPIXEL2, draw_end);
} else {
Uint8 _r, _g, _b, _a;
const SDL_PixelFormat * fmt = dst->format;
SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
if (fmt->Rmask == 0x7C00) {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB555,
draw_end);
} else if (fmt->Rmask == 0xF800) {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY_BLEND_RGB565,
draw_end);
} else {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY2, DRAW_SETPIXELXY2_BLEND_RGB,
draw_end);
}
}
}
static void
SDL_DrawLine4(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color,
SDL_bool draw_end)
{
if (y1 == y2) {
HLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
} else if (x1 == x2) {
VLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
} else if (ABS(x1 - x2) == ABS(y1 - y2)) {
DLINE(Uint32, DRAW_FASTSETPIXEL4, draw_end);
} else {
Uint8 _r, _g, _b, _a;
const SDL_PixelFormat * fmt = dst->format;
SDL_GetRGBA(color, fmt, &_r, &_g, &_b, &_a);
if (fmt->Rmask == 0x00FF0000) {
if (!fmt->Amask) {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_RGB888,
draw_end);
} else {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY_BLEND_ARGB8888,
draw_end);
}
} else {
AALINE(x1, y1, x2, y2,
DRAW_FASTSETPIXELXY4, DRAW_SETPIXELXY4_BLEND_RGB,
draw_end);
}
}
}
typedef void (*DrawLineFunc) (SDL_Surface * dst,
int x1, int y1, int x2, int y2,
Uint32 color, SDL_bool draw_end);
static DrawLineFunc
SDL_CalculateDrawLineFunc(const SDL_PixelFormat * fmt)
{
switch (fmt->BytesPerPixel) {
case 1:
if (fmt->BitsPerPixel < 8) {
break;
}
return SDL_DrawLine1;
case 2:
return SDL_DrawLine2;
case 4:
return SDL_DrawLine4;
}
return NULL;
}
int
SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color)
{
DrawLineFunc func;
if (!dst) {
return SDL_SetError("SDL_DrawLine(): Passed NULL destination surface");
}
func = SDL_CalculateDrawLineFunc(dst->format);
if (!func) {
return SDL_SetError("SDL_DrawLine(): Unsupported surface format");
}
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
return 0;
}
func(dst, x1, y1, x2, y2, color, SDL_TRUE);
return 0;
}
int
SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count,
Uint32 color)
{
int i;
int x1, y1;
int x2, y2;
SDL_bool draw_end;
DrawLineFunc func;
if (!dst) {
return SDL_SetError("SDL_DrawLines(): Passed NULL destination surface");
}
func = SDL_CalculateDrawLineFunc(dst->format);
if (!func) {
return SDL_SetError("SDL_DrawLines(): Unsupported surface format");
}
for (i = 1; i < count; ++i) {
x1 = points[i-1].x;
y1 = points[i-1].y;
x2 = points[i].x;
y2 = points[i].y;
/* Perform clipping */
/* FIXME: We don't actually want to clip, as it may change line slope */
if (!SDL_IntersectRectAndLine(&dst->clip_rect, &x1, &y1, &x2, &y2)) {
continue;
}
/* Draw the end if it was clipped */
draw_end = (x2 != points[i].x || y2 != points[i].y);
func(dst, x1, y1, x2, y2, color, draw_end);
}
if (points[0].x != points[count-1].x || points[0].y != points[count-1].y) {
SDL_DrawPoint(dst, points[count-1].x, points[count-1].y, color);
}
return 0;
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

27
src/render/software/SDL_drawline.h Normal file
View File

@@ -0,0 +1,27 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
extern int SDL_DrawLine(SDL_Surface * dst, int x1, int y1, int x2, int y2, Uint32 color);
extern int SDL_DrawLines(SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color);
/* vi: set ts=4 sw=4 expandtab: */

114
src/render/software/SDL_drawpoint.c Normal file
View File

@@ -0,0 +1,114 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "SDL_draw.h"
#include "SDL_drawpoint.h"
int
SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color)
{
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_DrawPoint(): Unsupported surface format");
}
/* Perform clipping */
if (x < dst->clip_rect.x || y < dst->clip_rect.y ||
x >= (dst->clip_rect.x + dst->clip_rect.w) ||
y >= (dst->clip_rect.y + dst->clip_rect.h)) {
return 0;
}
switch (dst->format->BytesPerPixel) {
case 1:
DRAW_FASTSETPIXELXY1(x, y);
break;
case 2:
DRAW_FASTSETPIXELXY2(x, y);
break;
case 3:
return SDL_Unsupported();
case 4:
DRAW_FASTSETPIXELXY4(x, y);
break;
}
return 0;
}
int
SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count,
Uint32 color)
{
int minx, miny;
int maxx, maxy;
int i;
int x, y;
if (!dst) {
return SDL_SetError("Passed NULL destination surface");
}
/* This function doesn't work on surfaces < 8 bpp */
if (dst->format->BitsPerPixel < 8) {
return SDL_SetError("SDL_DrawPoints(): Unsupported surface format");
}
minx = dst->clip_rect.x;
maxx = dst->clip_rect.x + dst->clip_rect.w - 1;
miny = dst->clip_rect.y;
maxy = dst->clip_rect.y + dst->clip_rect.h - 1;
for (i = 0; i < count; ++i) {
x = points[i].x;
y = points[i].y;
if (x < minx || x > maxx || y < miny || y > maxy) {
continue;
}
switch (dst->format->BytesPerPixel) {
case 1:
DRAW_FASTSETPIXELXY1(x, y);
break;
case 2:
DRAW_FASTSETPIXELXY2(x, y);
break;
case 3:
return SDL_Unsupported();
case 4:
DRAW_FASTSETPIXELXY4(x, y);
break;
}
}
return 0;
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

27
src/render/software/SDL_drawpoint.h Normal file
View File

@@ -0,0 +1,27 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
extern int SDL_DrawPoint(SDL_Surface * dst, int x, int y, Uint32 color);
extern int SDL_DrawPoints(SDL_Surface * dst, const SDL_Point * points, int count, Uint32 color);
/* vi: set ts=4 sw=4 expandtab: */

794
src/render/software/SDL_render_sw.c Normal file
View File

@@ -0,0 +1,794 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#if !SDL_RENDER_DISABLED
#include "../SDL_sysrender.h"
#include "SDL_render_sw_c.h"
#include "SDL_hints.h"
#include "SDL_draw.h"
#include "SDL_blendfillrect.h"
#include "SDL_blendline.h"
#include "SDL_blendpoint.h"
#include "SDL_drawline.h"
#include "SDL_drawpoint.h"
#include "SDL_rotate.h"
/* SDL surface based renderer implementation */
static SDL_Renderer *SW_CreateRenderer(SDL_Window * window, Uint32 flags);
static void SW_WindowEvent(SDL_Renderer * renderer,
const SDL_WindowEvent *event);
static int SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h);
static int SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_SetTextureColorMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SW_SetTextureAlphaMod(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SW_SetTextureBlendMode(SDL_Renderer * renderer,
SDL_Texture * texture);
static int SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels,
int pitch);
static int SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch);
static void SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture);
static int SW_UpdateViewport(SDL_Renderer * renderer);
static int SW_UpdateClipRect(SDL_Renderer * renderer);
static int SW_RenderClear(SDL_Renderer * renderer);
static int SW_RenderDrawPoints(SDL_Renderer * renderer,
const SDL_FPoint * points, int count);
static int SW_RenderDrawLines(SDL_Renderer * renderer,
const SDL_FPoint * points, int count);
static int SW_RenderFillRects(SDL_Renderer * renderer,
const SDL_FRect * rects, int count);
static int SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect);
static int SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip);
static int SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 format, void * pixels, int pitch);
static void SW_RenderPresent(SDL_Renderer * renderer);
static void SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture);
static void SW_DestroyRenderer(SDL_Renderer * renderer);
SDL_RenderDriver SW_RenderDriver = {
SW_CreateRenderer,
{
"software",
SDL_RENDERER_SOFTWARE | SDL_RENDERER_TARGETTEXTURE,
8,
{
SDL_PIXELFORMAT_ARGB8888,
SDL_PIXELFORMAT_ABGR8888,
SDL_PIXELFORMAT_RGBA8888,
SDL_PIXELFORMAT_BGRA8888,
SDL_PIXELFORMAT_RGB888,
SDL_PIXELFORMAT_BGR888,
SDL_PIXELFORMAT_RGB565,
SDL_PIXELFORMAT_RGB555
},
0,
0}
};
typedef struct
{
SDL_Surface *surface;
SDL_Surface *window;
} SW_RenderData;
static SDL_Surface *
SW_ActivateRenderer(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
if (!data->surface) {
data->surface = data->window;
}
if (!data->surface) {
SDL_Surface *surface = SDL_GetWindowSurface(renderer->window);
if (surface) {
data->surface = data->window = surface;
SW_UpdateViewport(renderer);
SW_UpdateClipRect(renderer);
}
}
return data->surface;
}
SDL_Renderer *
SW_CreateRendererForSurface(SDL_Surface * surface)
{
SDL_Renderer *renderer;
SW_RenderData *data;
if (!surface) {
SDL_SetError("Can't create renderer for NULL surface");
return NULL;
}
renderer = (SDL_Renderer *) SDL_calloc(1, sizeof(*renderer));
if (!renderer) {
SDL_OutOfMemory();
return NULL;
}
data = (SW_RenderData *) SDL_calloc(1, sizeof(*data));
if (!data) {
SW_DestroyRenderer(renderer);
SDL_OutOfMemory();
return NULL;
}
data->surface = surface;
data->window = surface;
renderer->WindowEvent = SW_WindowEvent;
renderer->GetOutputSize = SW_GetOutputSize;
renderer->CreateTexture = SW_CreateTexture;
renderer->SetTextureColorMod = SW_SetTextureColorMod;
renderer->SetTextureAlphaMod = SW_SetTextureAlphaMod;
renderer->SetTextureBlendMode = SW_SetTextureBlendMode;
renderer->UpdateTexture = SW_UpdateTexture;
renderer->LockTexture = SW_LockTexture;
renderer->UnlockTexture = SW_UnlockTexture;
renderer->SetRenderTarget = SW_SetRenderTarget;
renderer->UpdateViewport = SW_UpdateViewport;
renderer->UpdateClipRect = SW_UpdateClipRect;
renderer->RenderClear = SW_RenderClear;
renderer->RenderDrawPoints = SW_RenderDrawPoints;
renderer->RenderDrawLines = SW_RenderDrawLines;
renderer->RenderFillRects = SW_RenderFillRects;
renderer->RenderCopy = SW_RenderCopy;
renderer->RenderCopyEx = SW_RenderCopyEx;
renderer->RenderReadPixels = SW_RenderReadPixels;
renderer->RenderPresent = SW_RenderPresent;
renderer->DestroyTexture = SW_DestroyTexture;
renderer->DestroyRenderer = SW_DestroyRenderer;
renderer->info = SW_RenderDriver.info;
renderer->driverdata = data;
SW_ActivateRenderer(renderer);
return renderer;
}
SDL_Renderer *
SW_CreateRenderer(SDL_Window * window, Uint32 flags)
{
SDL_Surface *surface;
surface = SDL_GetWindowSurface(window);
if (!surface) {
return NULL;
}
return SW_CreateRendererForSurface(surface);
}
static void
SW_WindowEvent(SDL_Renderer * renderer, const SDL_WindowEvent *event)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
if (event->event == SDL_WINDOWEVENT_SIZE_CHANGED) {
data->surface = NULL;
data->window = NULL;
}
}
static int
SW_GetOutputSize(SDL_Renderer * renderer, int *w, int *h)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
if (surface) {
if (w) {
*w = surface->w;
}
if (h) {
*h = surface->h;
}
return 0;
} else {
SDL_SetError("Software renderer doesn't have an output surface");
return -1;
}
}
static int
SW_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
int bpp;
Uint32 Rmask, Gmask, Bmask, Amask;
if (!SDL_PixelFormatEnumToMasks
(texture->format, &bpp, &Rmask, &Gmask, &Bmask, &Amask)) {
return SDL_SetError("Unknown texture format");
}
texture->driverdata =
SDL_CreateRGBSurface(0, texture->w, texture->h, bpp, Rmask, Gmask,
Bmask, Amask);
SDL_SetSurfaceColorMod(texture->driverdata, texture->r, texture->g,
texture->b);
SDL_SetSurfaceAlphaMod(texture->driverdata, texture->a);
SDL_SetSurfaceBlendMode(texture->driverdata, texture->blendMode);
if (texture->access == SDL_TEXTUREACCESS_STATIC) {
SDL_SetSurfaceRLE(texture->driverdata, 1);
}
if (!texture->driverdata) {
return -1;
}
return 0;
}
static int
SW_SetTextureColorMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
/* If the color mod is ever enabled (non-white), permanently disable RLE (which doesn't support
* color mod) to avoid potentially frequent RLE encoding/decoding.
*/
if ((texture->r & texture->g & texture->b) != 255) {
SDL_SetSurfaceRLE(surface, 0);
}
return SDL_SetSurfaceColorMod(surface, texture->r, texture->g,
texture->b);
}
static int
SW_SetTextureAlphaMod(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
/* If the texture ever has multiple alpha values (surface alpha plus alpha channel), permanently
* disable RLE (which doesn't support this) to avoid potentially frequent RLE encoding/decoding.
*/
if (texture->a != 255 && surface->format->Amask) {
SDL_SetSurfaceRLE(surface, 0);
}
return SDL_SetSurfaceAlphaMod(surface, texture->a);
}
static int
SW_SetTextureBlendMode(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
/* If add or mod blending are ever enabled, permanently disable RLE (which doesn't support
* them) to avoid potentially frequent RLE encoding/decoding.
*/
if ((texture->blendMode == SDL_BLENDMODE_ADD || texture->blendMode == SDL_BLENDMODE_MOD)) {
SDL_SetSurfaceRLE(surface, 0);
}
return SDL_SetSurfaceBlendMode(surface, texture->blendMode);
}
static int
SW_UpdateTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, const void *pixels, int pitch)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
Uint8 *src, *dst;
int row;
size_t length;
if(SDL_MUSTLOCK(surface))
SDL_LockSurface(surface);
src = (Uint8 *) pixels;
dst = (Uint8 *) surface->pixels +
rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel;
length = rect->w * surface->format->BytesPerPixel;
for (row = 0; row < rect->h; ++row) {
SDL_memcpy(dst, src, length);
src += pitch;
dst += surface->pitch;
}
if(SDL_MUSTLOCK(surface))
SDL_UnlockSurface(surface);
return 0;
}
static int
SW_LockTexture(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * rect, void **pixels, int *pitch)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
*pixels =
(void *) ((Uint8 *) surface->pixels + rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
*pitch = surface->pitch;
return 0;
}
static void
SW_UnlockTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
}
static int
SW_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
if (texture ) {
data->surface = (SDL_Surface *) texture->driverdata;
} else {
data->surface = data->window;
}
return 0;
}
static int
SW_UpdateViewport(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->surface;
if (!surface) {
/* We'll update the viewport after we recreate the surface */
return 0;
}
SDL_SetClipRect(data->surface, &renderer->viewport);
return 0;
}
static int
SW_UpdateClipRect(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_Surface *surface = data->surface;
if (surface) {
if (renderer->clipping_enabled) {
SDL_SetClipRect(surface, &renderer->clip_rect);
} else {
SDL_SetClipRect(surface, NULL);
}
}
return 0;
}
static int
SW_RenderClear(SDL_Renderer * renderer)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 color;
SDL_Rect clip_rect;
if (!surface) {
return -1;
}
color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b, renderer->a);
/* By definition the clear ignores the clip rect */
clip_rect = surface->clip_rect;
SDL_SetClipRect(surface, NULL);
SDL_FillRect(surface, NULL, color);
SDL_SetClipRect(surface, &clip_rect);
return 0;
}
static int
SW_RenderDrawPoints(SDL_Renderer * renderer, const SDL_FPoint * points,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Point *final_points;
int i, status;
if (!surface) {
return -1;
}
final_points = SDL_stack_alloc(SDL_Point, count);
if (!final_points) {
return SDL_OutOfMemory();
}
if (renderer->viewport.x || renderer->viewport.y) {
int x = renderer->viewport.x;
int y = renderer->viewport.y;
for (i = 0; i < count; ++i) {
final_points[i].x = (int)(x + points[i].x);
final_points[i].y = (int)(y + points[i].y);
}
} else {
for (i = 0; i < count; ++i) {
final_points[i].x = (int)points[i].x;
final_points[i].y = (int)points[i].y;
}
}
/* Draw the points! */
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_DrawPoints(surface, final_points, count, color);
} else {
status = SDL_BlendPoints(surface, final_points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
SDL_stack_free(final_points);
return status;
}
static int
SW_RenderDrawLines(SDL_Renderer * renderer, const SDL_FPoint * points,
int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Point *final_points;
int i, status;
if (!surface) {
return -1;
}
final_points = SDL_stack_alloc(SDL_Point, count);
if (!final_points) {
return SDL_OutOfMemory();
}
if (renderer->viewport.x || renderer->viewport.y) {
int x = renderer->viewport.x;
int y = renderer->viewport.y;
for (i = 0; i < count; ++i) {
final_points[i].x = (int)(x + points[i].x);
final_points[i].y = (int)(y + points[i].y);
}
} else {
for (i = 0; i < count; ++i) {
final_points[i].x = (int)points[i].x;
final_points[i].y = (int)points[i].y;
}
}
/* Draw the lines! */
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_DrawLines(surface, final_points, count, color);
} else {
status = SDL_BlendLines(surface, final_points, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
SDL_stack_free(final_points);
return status;
}
static int
SW_RenderFillRects(SDL_Renderer * renderer, const SDL_FRect * rects, int count)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Rect *final_rects;
int i, status;
if (!surface) {
return -1;
}
final_rects = SDL_stack_alloc(SDL_Rect, count);
if (!final_rects) {
return SDL_OutOfMemory();
}
if (renderer->viewport.x || renderer->viewport.y) {
int x = renderer->viewport.x;
int y = renderer->viewport.y;
for (i = 0; i < count; ++i) {
final_rects[i].x = (int)(x + rects[i].x);
final_rects[i].y = (int)(y + rects[i].y);
final_rects[i].w = SDL_max((int)rects[i].w, 1);
final_rects[i].h = SDL_max((int)rects[i].h, 1);
}
} else {
for (i = 0; i < count; ++i) {
final_rects[i].x = (int)rects[i].x;
final_rects[i].y = (int)rects[i].y;
final_rects[i].w = SDL_max((int)rects[i].w, 1);
final_rects[i].h = SDL_max((int)rects[i].h, 1);
}
}
if (renderer->blendMode == SDL_BLENDMODE_NONE) {
Uint32 color = SDL_MapRGBA(surface->format,
renderer->r, renderer->g, renderer->b,
renderer->a);
status = SDL_FillRects(surface, final_rects, count, color);
} else {
status = SDL_BlendFillRects(surface, final_rects, count,
renderer->blendMode,
renderer->r, renderer->g, renderer->b,
renderer->a);
}
SDL_stack_free(final_rects);
return status;
}
static int
SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
if ( srcrect->w == final_rect.w && srcrect->h == final_rect.h ) {
return SDL_BlitSurface(src, srcrect, surface, &final_rect);
} else {
/* If scaling is ever done, permanently disable RLE (which doesn't support scaling)
* to avoid potentially frequent RLE encoding/decoding.
*/
SDL_SetSurfaceRLE(surface, 0);
return SDL_BlitScaled(src, srcrect, surface, &final_rect);
}
}
static int
GetScaleQuality(void)
{
const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
return 0;
} else {
return 1;
}
}
static int
SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
const SDL_Rect * srcrect, const SDL_FRect * dstrect,
const double angle, const SDL_FPoint * center, const SDL_RendererFlip flip)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
SDL_Surface *src = (SDL_Surface *) texture->driverdata;
SDL_Rect final_rect, tmp_rect;
SDL_Surface *surface_rotated, *surface_scaled;
int retval, dstwidth, dstheight, abscenterx, abscentery;
double cangle, sangle, px, py, p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = (int)(renderer->viewport.x + dstrect->x);
final_rect.y = (int)(renderer->viewport.y + dstrect->y);
} else {
final_rect.x = (int)dstrect->x;
final_rect.y = (int)dstrect->y;
}
final_rect.w = (int)dstrect->w;
final_rect.h = (int)dstrect->h;
/* SDLgfx_rotateSurface doesn't accept a source rectangle, so crop and scale if we need to */
tmp_rect = final_rect;
tmp_rect.x = 0;
tmp_rect.y = 0;
if (srcrect->w == final_rect.w && srcrect->h == final_rect.h && srcrect->x == 0 && srcrect->y == 0) {
surface_scaled = src; /* but if we don't need to, just use the original */
retval = 0;
} else {
SDL_Surface *blit_src = src;
Uint32 colorkey;
SDL_BlendMode blendMode;
Uint8 alphaMod, r, g, b;
SDL_bool cloneSource = SDL_FALSE;
surface_scaled = SDL_CreateRGBSurface(SDL_SWSURFACE, final_rect.w, final_rect.h, src->format->BitsPerPixel,
src->format->Rmask, src->format->Gmask,
src->format->Bmask, src->format->Amask );
if (!surface_scaled) {
return -1;
}
/* copy the color key, alpha mod, blend mode, and color mod so the scaled surface behaves like the source */
if (SDL_GetColorKey(src, &colorkey) == 0) {
SDL_SetColorKey(surface_scaled, SDL_TRUE, colorkey);
cloneSource = SDL_TRUE;
}
SDL_GetSurfaceAlphaMod(src, &alphaMod); /* these will be copied to surface_scaled below if necessary */
SDL_GetSurfaceBlendMode(src, &blendMode);
SDL_GetSurfaceColorMod(src, &r, &g, &b);
/* now we need to blit the src into surface_scaled. since we want to copy the colors from the source to
* surface_scaled rather than blend them, etc. we'll need to disable the blend mode, alpha mod, etc.
* but we don't want to modify src (in case it's being used on other threads), so we'll need to clone it
* before changing the blend options
*/
cloneSource |= blendMode != SDL_BLENDMODE_NONE || (alphaMod & r & g & b) != 255;
if (cloneSource) {
blit_src = SDL_ConvertSurface(src, src->format, src->flags); /* clone src */
if (!blit_src) {
SDL_FreeSurface(surface_scaled);
return -1;
}
SDL_SetSurfaceAlphaMod(blit_src, 255); /* disable all blending options in blit_src */
SDL_SetSurfaceBlendMode(blit_src, SDL_BLENDMODE_NONE);
SDL_SetColorKey(blit_src, 0, 0);
SDL_SetSurfaceColorMod(blit_src, 255, 255, 255);
SDL_SetSurfaceRLE(blit_src, 0); /* don't RLE encode a surface we'll only use once */
SDL_SetSurfaceAlphaMod(surface_scaled, alphaMod); /* copy blending options to surface_scaled */
SDL_SetSurfaceBlendMode(surface_scaled, blendMode);
SDL_SetSurfaceColorMod(surface_scaled, r, g, b);
}
retval = SDL_BlitScaled(blit_src, srcrect, surface_scaled, &tmp_rect);
if (blit_src != src) {
SDL_FreeSurface(blit_src);
}
}
if (!retval) {
SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, -angle, &dstwidth, &dstheight, &cangle, &sangle);
surface_rotated = SDLgfx_rotateSurface(surface_scaled, -angle, dstwidth/2, dstheight/2, GetScaleQuality(), flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
if(surface_rotated) {
/* Find out where the new origin is by rotating the four final_rect points around the center and then taking the extremes */
abscenterx = final_rect.x + (int)center->x;
abscentery = final_rect.y + (int)center->y;
/* Compensate the angle inversion to match the behaviour of the other backends */
sangle = -sangle;
/* Top Left */
px = final_rect.x - abscenterx;
py = final_rect.y - abscentery;
p1x = px * cangle - py * sangle + abscenterx;
p1y = px * sangle + py * cangle + abscentery;
/* Top Right */
px = final_rect.x + final_rect.w - abscenterx;
py = final_rect.y - abscentery;
p2x = px * cangle - py * sangle + abscenterx;
p2y = px * sangle + py * cangle + abscentery;
/* Bottom Left */
px = final_rect.x - abscenterx;
py = final_rect.y + final_rect.h - abscentery;
p3x = px * cangle - py * sangle + abscenterx;
p3y = px * sangle + py * cangle + abscentery;
/* Bottom Right */
px = final_rect.x + final_rect.w - abscenterx;
py = final_rect.y + final_rect.h - abscentery;
p4x = px * cangle - py * sangle + abscenterx;
p4y = px * sangle + py * cangle + abscentery;
tmp_rect.x = (int)MIN(MIN(p1x, p2x), MIN(p3x, p4x));
tmp_rect.y = (int)MIN(MIN(p1y, p2y), MIN(p3y, p4y));
tmp_rect.w = dstwidth;
tmp_rect.h = dstheight;
retval = SDL_BlitSurface(surface_rotated, NULL, surface, &tmp_rect);
SDL_FreeSurface(surface_rotated);
}
}
if (surface_scaled != src) {
SDL_FreeSurface(surface_scaled);
}
return retval;
}
static int
SW_RenderReadPixels(SDL_Renderer * renderer, const SDL_Rect * rect,
Uint32 format, void * pixels, int pitch)
{
SDL_Surface *surface = SW_ActivateRenderer(renderer);
Uint32 src_format;
void *src_pixels;
SDL_Rect final_rect;
if (!surface) {
return -1;
}
if (renderer->viewport.x || renderer->viewport.y) {
final_rect.x = renderer->viewport.x + rect->x;
final_rect.y = renderer->viewport.y + rect->y;
final_rect.w = rect->w;
final_rect.h = rect->h;
rect = &final_rect;
}
if (rect->x < 0 || rect->x+rect->w > surface->w ||
rect->y < 0 || rect->y+rect->h > surface->h) {
return SDL_SetError("Tried to read outside of surface bounds");
}
src_format = surface->format->format;
src_pixels = (void*)((Uint8 *) surface->pixels +
rect->y * surface->pitch +
rect->x * surface->format->BytesPerPixel);
return SDL_ConvertPixels(rect->w, rect->h,
src_format, src_pixels, surface->pitch,
format, pixels, pitch);
}
static void
SW_RenderPresent(SDL_Renderer * renderer)
{
SDL_Window *window = renderer->window;
if (window) {
SDL_UpdateWindowSurface(window);
}
}
static void
SW_DestroyTexture(SDL_Renderer * renderer, SDL_Texture * texture)
{
SDL_Surface *surface = (SDL_Surface *) texture->driverdata;
SDL_FreeSurface(surface);
}
static void
SW_DestroyRenderer(SDL_Renderer * renderer)
{
SW_RenderData *data = (SW_RenderData *) renderer->driverdata;
SDL_free(data);
SDL_free(renderer);
}
#endif /* !SDL_RENDER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */

24
src/render/software/SDL_render_sw_c.h Normal file
View File

@@ -0,0 +1,24 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
extern SDL_Renderer * SW_CreateRendererForSurface(SDL_Surface * surface);
/* vi: set ts=4 sw=4 expandtab: */

496
src/render/software/SDL_rotate.c Normal file
View File

@@ -0,0 +1,496 @@
/*
SDL_rotate.c: rotates 32bit or 8bit surfaces
Shamelessly stolen from SDL_gfx by Andreas Schiffler. Original copyright follows:
Copyright (C) 2001-2011 Andreas Schiffler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source
distribution.
Andreas Schiffler -- aschiffler at ferzkopp dot net
*/
#include "../../SDL_internal.h"
#if defined(__WIN32__)
#include "../../core/windows/SDL_windows.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
#include "SDL_rotate.h"
/* ---- Internally used structures */
/* !
\brief A 32 bit RGBA pixel.
*/
typedef struct tColorRGBA {
Uint8 r;
Uint8 g;
Uint8 b;
Uint8 a;
} tColorRGBA;
/* !
\brief A 8bit Y/palette pixel.
*/
typedef struct tColorY {
Uint8 y;
} tColorY;
/* !
\brief Returns maximum of two numbers a and b.
*/
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
/* !
\brief Number of guard rows added to destination surfaces.
This is a simple but effective workaround for observed issues.
These rows allocate extra memory and are then hidden from the surface.
Rows are added to the end of destination surfaces when they are allocated.
This catches any potential overflows which seem to happen with
just the right src image dimensions and scale/rotation and can lead
to a situation where the program can segfault.
*/
#define GUARD_ROWS (2)
/* !
\brief Lower limit of absolute zoom factor or rotation degrees.
*/
#define VALUE_LIMIT 0.001
/* !
\brief Returns colorkey info for a surface
*/
static Uint32
_colorkey(SDL_Surface *src)
{
Uint32 key = 0;
SDL_GetColorKey(src, &key);
return key;
}
/* !
\brief Internal target surface sizing function for rotations with trig result return.
\param width The source surface width.
\param height The source surface height.
\param angle The angle to rotate in degrees.
\param dstwidth The calculated width of the destination surface.
\param dstheight The calculated height of the destination surface.
\param cangle The sine of the angle
\param sangle The cosine of the angle
*/
void
SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle,
int *dstwidth, int *dstheight,
double *cangle, double *sangle)
{
double x, y, cx, cy, sx, sy;
double radangle;
int dstwidthhalf, dstheighthalf;
/*
* Determine destination width and height by rotating a centered source box
*/
radangle = angle * (M_PI / 180.0);
*sangle = SDL_sin(radangle);
*cangle = SDL_cos(radangle);
x = (double)(width / 2);
y = (double)(height / 2);
cx = *cangle * x;
cy = *cangle * y;
sx = *sangle * x;
sy = *sangle * y;
dstwidthhalf = MAX((int)
SDL_ceil(MAX(MAX(MAX(SDL_fabs(cx + sy), SDL_fabs(cx - sy)), SDL_fabs(-cx + sy)), SDL_fabs(-cx - sy))), 1);
dstheighthalf = MAX((int)
SDL_ceil(MAX(MAX(MAX(SDL_fabs(sx + cy), SDL_fabs(sx - cy)), SDL_fabs(-sx + cy)), SDL_fabs(-sx - cy))), 1);
*dstwidth = 2 * dstwidthhalf;
*dstheight = 2 * dstheighthalf;
}
/* !
\brief Internal 32 bit rotozoomer with optional anti-aliasing.
Rotates and zooms 32 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
parameters by scanning the destination surface and applying optionally anti-aliasing
by bilinear interpolation.
Assumes src and dst surfaces are of 32 bit depth.
Assumes dst surface was allocated with the correct dimensions.
\param src Source surface.
\param dst Destination surface.
\param cx Horizontal center coordinate.
\param cy Vertical center coordinate.
\param isin Integer version of sine of angle.
\param icos Integer version of cosine of angle.
\param flipx Flag indicating horizontal mirroring should be applied.
\param flipy Flag indicating vertical mirroring should be applied.
\param smooth Flag indicating anti-aliasing should be used.
*/
static void
_transformSurfaceRGBA(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int flipx, int flipy, int smooth)
{
int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
tColorRGBA c00, c01, c10, c11, cswap;
tColorRGBA *pc, *sp;
int gap;
/*
* Variable setup
*/
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
sw = src->w - 1;
sh = src->h - 1;
pc = (tColorRGBA*) dst->pixels;
gap = dst->pitch - dst->w * 4;
/*
* Switch between interpolating and non-interpolating code
*/
if (smooth) {
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (sdx >> 16);
dy = (sdy >> 16);
if (flipx) dx = sw - dx;
if (flipy) dy = sh - dy;
if ((unsigned)dx < (unsigned)sw && (unsigned)dy < (unsigned)sh) {
sp = (tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy) + dx;
c00 = *sp;
sp += 1;
c01 = *sp;
sp += (src->pitch/4);
c11 = *sp;
sp -= 1;
c10 = *sp;
if (flipx) {
cswap = c00; c00=c01; c01=cswap;
cswap = c10; c10=c11; c11=cswap;
}
if (flipy) {
cswap = c00; c00=c10; c10=cswap;
cswap = c01; c01=c11; c11=cswap;
}
/*
* Interpolate colors
*/
ex = (sdx & 0xffff);
ey = (sdy & 0xffff);
t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
pc->r = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
pc->g = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
pc->b = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
pc->a = (((t2 - t1) * ey) >> 16) + t1;
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
} else {
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (sdx >> 16);
dy = (sdy >> 16);
if ((unsigned)dx < (unsigned)src->w && (unsigned)dy < (unsigned)src->h) {
if(flipx) dx = sw - dx;
if(flipy) dy = sh - dy;
*pc = *((tColorRGBA *)((Uint8 *)src->pixels + src->pitch * dy) + dx);
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
}
}
/* !
\brief Rotates and zooms 8 bit palette/Y 'src' surface to 'dst' surface without smoothing.
Rotates and zooms 8 bit RGBA/ABGR 'src' surface to 'dst' surface based on the control
parameters by scanning the destination surface.
Assumes src and dst surfaces are of 8 bit depth.
Assumes dst surface was allocated with the correct dimensions.
\param src Source surface.
\param dst Destination surface.
\param cx Horizontal center coordinate.
\param cy Vertical center coordinate.
\param isin Integer version of sine of angle.
\param icos Integer version of cosine of angle.
\param flipx Flag indicating horizontal mirroring should be applied.
\param flipy Flag indicating vertical mirroring should be applied.
*/
static void
transformSurfaceY(SDL_Surface * src, SDL_Surface * dst, int cx, int cy, int isin, int icos, int flipx, int flipy)
{
int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay;
tColorY *pc;
int gap;
/*
* Variable setup
*/
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
pc = (tColorY*) dst->pixels;
gap = dst->pitch - dst->w;
/*
* Clear surface to colorkey
*/
SDL_memset(pc, (int)(_colorkey(src) & 0xff), dst->pitch * dst->h);
/*
* Iterate through destination surface
*/
for (y = 0; y < dst->h; y++) {
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++) {
dx = (sdx >> 16);
dy = (sdy >> 16);
if ((unsigned)dx < (unsigned)src->w && (unsigned)dy < (unsigned)src->h) {
if (flipx) dx = (src->w-1)-dx;
if (flipy) dy = (src->h-1)-dy;
*pc = *((tColorY *)src->pixels + src->pitch * dy + dx);
}
sdx += icos;
sdy += isin;
pc++;
}
pc += gap;
}
}
/* !
\brief Rotates and zooms a surface with different horizontal and vertival scaling factors and optional anti-aliasing.
Rotates a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'angle' is the rotation in degrees, 'centerx' and 'centery' the rotation center. If 'smooth' is set
then the destination 32bit surface is anti-aliased. If the surface is not 8bit
or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
\param src The surface to rotozoom.
\param angle The angle to rotate in degrees.
\param centerx The horizontal coordinate of the center of rotation
\param zoomy The vertical coordinate of the center of rotation
\param smooth Antialiasing flag; set to SMOOTHING_ON to enable.
\param flipx Set to 1 to flip the image horizontally
\param flipy Set to 1 to flip the image vertically
\param dstwidth The destination surface width
\param dstheight The destination surface height
\param cangle The angle cosine
\param sangle The angle sine
\return The new rotated surface.
*/
SDL_Surface *
SDLgfx_rotateSurface(SDL_Surface * src, double angle, int centerx, int centery, int smooth, int flipx, int flipy, int dstwidth, int dstheight, double cangle, double sangle)
{
SDL_Surface *rz_src;
SDL_Surface *rz_dst;
int is32bit;
int i;
Uint8 r,g,b;
Uint32 colorkey = 0;
int colorKeyAvailable = 0;
double sangleinv, cangleinv;
/*
* Sanity check
*/
if (src == NULL)
return (NULL);
if (src->flags & SDL_TRUE/* SDL_SRCCOLORKEY */)
{
colorkey = _colorkey(src);
SDL_GetRGB(colorkey, src->format, &r, &g, &b);
colorKeyAvailable = 1;
}
/*
* Determine if source surface is 32bit or 8bit
*/
is32bit = (src->format->BitsPerPixel == 32);
if ((is32bit) || (src->format->BitsPerPixel == 8)) {
/*
* Use source surface 'as is'
*/
rz_src = src;
} else {
Uint32 format = SDL_MasksToPixelFormatEnum(32,
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
#else
0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
#endif
);
rz_src = SDL_ConvertSurfaceFormat(src, format, src->flags);
is32bit = 1;
}
/* Determine target size */
/* _rotozoomSurfaceSizeTrig(rz_src->w, rz_src->h, angle, &dstwidth, &dstheight, &cangle, &sangle); */
/*
* Calculate target factors from sin/cos and zoom
*/
sangleinv = sangle*65536.0;
cangleinv = cangle*65536.0;
/*
* Alloc space to completely contain the rotated surface
*/
rz_dst = NULL;
if (is32bit) {
/*
* Target surface is 32bit with source RGBA/ABGR ordering
*/
rz_dst =
SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + GUARD_ROWS, 32,
rz_src->format->Rmask, rz_src->format->Gmask,
rz_src->format->Bmask, rz_src->format->Amask);
} else {
/*
* Target surface is 8bit
*/
rz_dst = SDL_CreateRGBSurface(SDL_SWSURFACE, dstwidth, dstheight + GUARD_ROWS, 8, 0, 0, 0, 0);
}
/* Check target */
if (rz_dst == NULL)
return NULL;
/* Adjust for guard rows */
rz_dst->h = dstheight;
if (colorKeyAvailable == 1){
colorkey = SDL_MapRGB(rz_dst->format, r, g, b);
SDL_FillRect(rz_dst, NULL, colorkey );
}
/*
* Lock source surface
*/
if (SDL_MUSTLOCK(rz_src)) {
SDL_LockSurface(rz_src);
}
/*
* Check which kind of surface we have
*/
if (is32bit) {
/*
* Call the 32bit transformation routine to do the rotation (using alpha)
*/
_transformSurfaceRGBA(rz_src, rz_dst, centerx, centery,
(int) (sangleinv), (int) (cangleinv),
flipx, flipy,
smooth);
/*
* Turn on source-alpha support
*/
/* SDL_SetAlpha(rz_dst, SDL_SRCALPHA, 255); */
SDL_SetColorKey(rz_dst, /* SDL_SRCCOLORKEY */ SDL_TRUE | SDL_RLEACCEL, _colorkey(rz_src));
} else {
/*
* Copy palette and colorkey info
*/
for (i = 0; i < rz_src->format->palette->ncolors; i++) {
rz_dst->format->palette->colors[i] = rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
/*
* Call the 8bit transformation routine to do the rotation
*/
transformSurfaceY(rz_src, rz_dst, centerx, centery,
(int) (sangleinv), (int) (cangleinv),
flipx, flipy);
SDL_SetColorKey(rz_dst, /* SDL_SRCCOLORKEY */ SDL_TRUE | SDL_RLEACCEL, _colorkey(rz_src));
}
/* copy alpha mod, color mod, and blend mode */
{
SDL_BlendMode blendMode;
Uint8 alphaMod, r, g, b;
SDL_GetSurfaceAlphaMod(src, &alphaMod);
SDL_GetSurfaceBlendMode(src, &blendMode);
SDL_GetSurfaceColorMod(src, &r, &g, &b);
SDL_SetSurfaceAlphaMod(rz_dst, alphaMod);
SDL_SetSurfaceBlendMode(rz_dst, blendMode);
SDL_SetSurfaceColorMod(rz_dst, r, g, b);
}
/*
* Unlock source surface
*/
if (SDL_MUSTLOCK(rz_src)) {
SDL_UnlockSurface(rz_src);
}
/*
* Cleanup temp surface
*/
if (rz_src != src) {
SDL_FreeSurface(rz_src);
}
/*
* Return destination surface
*/
return (rz_dst);
}

28
src/render/software/SDL_rotate.h Normal file
View File

@@ -0,0 +1,28 @@
/*
Simple DirectMedia Layer
Copyright (C) 1997-2015 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif
extern SDL_Surface *SDLgfx_rotateSurface(SDL_Surface * src, double angle, int centerx, int centery, int smooth, int flipx, int flipy, int dstwidth, int dstheight, double cangle, double sangle);
extern void SDLgfx_rotozoomSurfaceSizeTrig(int width, int height, double angle, int *dstwidth, int *dstheight, double *cangle, double *sangle);