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Re-added a simplified version of SDL_SetWindowShape()

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In order to handle mouse click transparency this needs to be implemented inside SDL
This commit is contained in:
Sam Lantinga
2024-02-09 07:09:59 -08:00
parent 1143bdc351
commit f6b92c9b88
33 changed files with 128676 additions and 59 deletions
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95
test/testshape.c
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@@ -12,24 +12,69 @@
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include "glass.h"
static SDL_HitTestResult SDLCALL ShapeHitTest(SDL_Window *window, const SDL_Point *area, void *userdata)
{
SDL_Surface *shape = (SDL_Surface *)userdata;
Uint8 r, g, b, a;
if (SDL_ReadSurfacePixel(shape, area->x, area->y, &r, &g, &b, &a) == 0) {
if (a != SDL_ALPHA_TRANSPARENT) {
/* We'll just make everything draggable */
return SDL_HITTEST_DRAGGABLE;
}
}
return SDL_HITTEST_NORMAL;
}
int main(int argc, char *argv[])
{
const char *image_file = NULL;
SDL_Window *window = NULL;
SDL_Renderer *renderer = NULL;
SDL_Surface *shape = NULL;
SDL_Texture *shape_texture = NULL;
SDL_Event event;
SDL_bool resizable = SDL_FALSE;
Uint32 flags;
SDL_bool done = SDL_FALSE;
SDL_Event event;
int i;
int return_code = 1;
if (argc != 2) {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Usage: %s shape.bmp\n", argv[0]);
goto quit;
for (i = 1; i < argc; ++i) {
if (SDL_strcmp(argv[i], "--resizable") == 0) {
resizable = SDL_TRUE;
} else if (!image_file) {
image_file = argv[i];
} else {
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Usage: %s [--resizable] [shape.bmp]\n", argv[0]);
goto quit;
}
}
/* Create the window hidden so we can set the window size to match our shape */
window = SDL_CreateWindow("Shape test", 1, 1, SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
if (image_file) {
shape = SDL_LoadBMP(image_file);
if (!shape) {
SDL_Log("Couldn't load %s: %s\n", image_file, SDL_GetError());
goto quit;
}
} else {
shape = SDL_LoadBMP_RW(SDL_RWFromConstMem(glass_bmp, sizeof(glass_bmp)), SDL_TRUE);
if (!shape) {
SDL_Log("Couldn't load glass.bmp: %s\n", SDL_GetError());
goto quit;
}
}
/* Create the window hidden so we can set the shape before it's visible */
flags = (SDL_WINDOW_HIDDEN | SDL_WINDOW_TRANSPARENT);
if (resizable) {
flags |= SDL_WINDOW_RESIZABLE;
} else {
flags |= SDL_WINDOW_BORDERLESS;
}
window = SDL_CreateWindow("SDL Shape Test", shape->w, shape->h, flags);
if (!window) {
SDL_Log("Couldn't create transparent window: %s\n", SDL_GetError());
goto quit;
@@ -41,12 +86,6 @@ int main(int argc, char *argv[])
goto quit;
}
shape = SDL_LoadBMP(argv[1]);
if (!shape) {
SDL_Log("Couldn't load %s: %s\n", argv[1], SDL_GetError());
goto quit;
}
if (!SDL_ISPIXELFORMAT_ALPHA(shape->format->format)) {
/* Set the colorkey to the top-left pixel */
Uint8 r, g, b, a;
@@ -55,24 +94,16 @@ int main(int argc, char *argv[])
SDL_SetSurfaceColorKey(shape, 1, SDL_MapRGBA(shape->format, r, g, b, a));
}
shape_texture = SDL_CreateTextureFromSurface(renderer, shape);
if (!shape_texture) {
SDL_Log("Couldn't create shape texture: %s\n", SDL_GetError());
goto quit;
}
/* Set the blend mode so the alpha channel of the shape is the window transparency */
if (SDL_SetTextureBlendMode(shape_texture,
SDL_ComposeCustomBlendMode(
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD,
SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD)) < 0) {
SDL_Log("Couldn't set shape blend mode: %s\n", SDL_GetError());
goto quit;
if (!resizable) {
/* Set the hit test callback so we can drag the window */
if (SDL_SetWindowHitTest(window, ShapeHitTest, shape) < 0) {
SDL_Log("Couldn't set hit test callback: %s\n", SDL_GetError());
goto quit;
}
}
/* Set the window size to the size of our shape and show it */
SDL_SetWindowSize(window, shape->w, shape->h);
SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
SDL_SetWindowShape(window, shape);
SDL_ShowWindow(window);
/* We're ready to go! */
@@ -80,8 +111,11 @@ int main(int argc, char *argv[])
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_EVENT_KEY_DOWN:
if (event.key.keysym.sym == SDLK_ESCAPE) {
done = SDL_TRUE;
}
break;
case SDL_EVENT_QUIT:
/* Quit on keypress and quit event */
done = SDL_TRUE;
break;
default:
@@ -93,9 +127,6 @@ int main(int argc, char *argv[])
SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
SDL_RenderClear(renderer);
/* Apply the shape */
SDL_RenderTexture(renderer, shape_texture, NULL, NULL);
/* Show everything on the screen and wait a bit */
SDL_RenderPresent(renderer);
SDL_Delay(100);