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Don't recalculate the blit mapping when changing surfaces

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We don't actually need to change the blit mapping if we're targeting a new surface with the same format and palette.
This commit is contained in:
Sam Lantinga
2024-07-21 10:31:48 -07:00
parent 68cabc2837
commit bab982f2e0
12 changed files with 104 additions and 56 deletions
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70
test/testautomation_surface.c
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@@ -539,6 +539,71 @@ static int surface_testBlit9Grid(void *arg)
return TEST_COMPLETED;
}
/**
* Tests blitting between multiple surfaces of the same format
*/
static int surface_testBlitMultiple(void *arg)
{
SDL_Surface *source, *surface;
SDL_Palette *palette;
Uint8 *pixels;
palette = SDL_CreatePalette(2);
SDLTest_AssertCheck(palette != NULL, "SDL_CreatePalette()");
palette->colors[0].r = 0;
palette->colors[0].g = 0;
palette->colors[0].b = 0;
palette->colors[1].r = 0xFF;
palette->colors[1].g = 0;
palette->colors[1].b = 0;
source = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_INDEX8);
SDLTest_AssertCheck(source != NULL, "SDL_CreateSurface()");
SDL_SetSurfacePalette(source, palette);
*(Uint8 *)source->pixels = 1;
/* Set up a blit to a surface using the palette */
surface = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_INDEX8);
SDLTest_AssertCheck(surface != NULL, "SDL_CreateSurface()");
SDL_SetSurfacePalette(surface, palette);
pixels = (Uint8 *)surface->pixels;
*pixels = 0;
SDL_BlitSurface(source, NULL, surface, NULL);
SDLTest_AssertCheck(*pixels == 1, "Expected *pixels == 1 got %u", *pixels);
/* Set up a blit to another surface using the same palette */
SDL_DestroySurface(surface);
surface = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_INDEX8);
SDLTest_AssertCheck(surface != NULL, "SDL_CreateSurface()");
SDL_SetSurfacePalette(surface, palette);
pixels = (Uint8 *)surface->pixels;
*pixels = 0;
SDL_BlitSurface(source, NULL, surface, NULL);
SDLTest_AssertCheck(*pixels == 1, "Expected *pixels == 1 got %u", *pixels);
/* Set up a blit to new surface with a different format */
SDL_DestroySurface(surface);
surface = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_RGBA32);
SDLTest_AssertCheck(surface != NULL, "SDL_CreateSurface()");
pixels = (Uint8 *)surface->pixels;
SDL_BlitSurface(source, NULL, surface, NULL);
SDLTest_AssertCheck(*pixels == 0xFF, "Expected *pixels == 0xFF got 0x%.2X", *pixels);
/* Set up a blit to another surface with the same format */
SDL_DestroySurface(surface);
surface = SDL_CreateSurface(1, 1, SDL_PIXELFORMAT_RGBA32);
SDLTest_AssertCheck(surface != NULL, "SDL_CreateSurface()");
pixels = (Uint8 *)surface->pixels;
SDL_BlitSurface(source, NULL, surface, NULL);
SDLTest_AssertCheck(*pixels == 0xFF, "Expected *pixels == 0xFF got 0x%.2X", *pixels);
SDL_DestroyPalette(palette);
SDL_DestroySurface(source);
SDL_DestroySurface(surface);
return TEST_COMPLETED;
}
/**
* Tests surface conversion.
*/
@@ -1227,6 +1292,10 @@ static const SDLTest_TestCaseReference surfaceTestBlit9Grid = {
(SDLTest_TestCaseFp)surface_testBlit9Grid, "surface_testBlit9Grid", "Tests 9-grid blitting.", TEST_ENABLED
};
static const SDLTest_TestCaseReference surfaceTestBlitMultiple = {
(SDLTest_TestCaseFp)surface_testBlitMultiple, "surface_testBlitMultiple", "Tests blitting between multiple surfaces of the same format.", TEST_ENABLED
};
static const SDLTest_TestCaseReference surfaceTestLoadFailure = {
(SDLTest_TestCaseFp)surface_testLoadFailure, "surface_testLoadFailure", "Tests sprite loading. A failure case.", TEST_ENABLED
};
@@ -1297,6 +1366,7 @@ static const SDLTest_TestCaseReference *surfaceTests[] = {
&surfaceTestBlit,
&surfaceTestBlitTiled,
&surfaceTestBlit9Grid,
&surfaceTestBlitMultiple,
&surfaceTestLoadFailure,
&surfaceTestSurfaceConversion,
&surfaceTestCompleteSurfaceConversion,