ikolokolnikov/handmadehero
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Some improvements to rendering of program icon.

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This commit is contained in:
ikolokolnikov
2026-05-27 23:09:06 -07:00
parent cbc0a07a1c
commit d2c6c337b7
2 changed files with 7 additions and 122502 deletions
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sdl_handmade.c
+7 -25
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@@ -635,7 +635,7 @@ static void DrawBitmap(game_offscreen_buffer *Buffer, loaded_bitmap *Bitmap, F32
U32 *Dest = (U32 *)DestRow;
U32 *Source = SourceRow;
for(S32 X = MinX; X < MaxX; X++) {
F32 A = (F32)((*Source >> 24) & 0xFF) / 255.0f;
F32 SA = (F32)((*Source >> 24) & 0xFF);
F32 SR = (F32)((*Source >> 16) & 0xFF);
F32 SG = (F32)((*Source >> 8) & 0xFF);
F32 SB = (F32)((*Source >> 0) & 0xFF);
@@ -644,12 +644,14 @@ static void DrawBitmap(game_offscreen_buffer *Buffer, loaded_bitmap *Bitmap, F32
F32 DG = (F32)((*Dest >> 8) & 0xFF);
F32 DB = (F32)((*Dest >> 0) & 0xFF);
F32 A = SA / 255.0f;
// TODO: This should be replaced by premultiplied alpha.
F32 R = (1.0f-A)*DR + A*SR;
F32 G = (1.0f-A)*DG + A*SG;
F32 B = (1.0f-A)*DB + A*SB;
*Dest = (((U32)RoundF32toS32(R) << 16) | ((U32)RoundF32toS32(G) << 8) | ((U32)RoundF32toS32(B) << 0));
*Dest = (((U32)RoundF32toS32(SA) << 24) | ((U32)RoundF32toS32(R) << 16) | ((U32)RoundF32toS32(G) << 8) | ((U32)RoundF32toS32(B) << 0));
Dest++;
Source++;
@@ -729,21 +731,6 @@ static loaded_bitmap DEBUGLoadBMPP(thread_context *Thread, debug_read_file_resul
SourceDest++;
}
}
#if 0
U32 *Beginning = Pixels;
U32 *Ending = Pixels + (Header->Width * Header->Height);
for(S32 Y = 0; Y < Header->Height; Y++) {
for(S32 X = 0; X < Header->Width; X++) {
U32 Temp = *Beginning;
*Beginning = *Ending;
*Ending = Temp;
Beginning++;
Ending--;
}
}
#endif
}
return Result;
@@ -751,13 +738,7 @@ static loaded_bitmap DEBUGLoadBMPP(thread_context *Thread, debug_read_file_resul
void SDLSetProgramIcon(SDL_Window *Window, game_offscreen_buffer *ProgramIcon)
{
U32 Rmask, Gmask, Bmask, Amask;
Rmask = 0x00ff0000;
Gmask = 0x0000ff00;
Bmask = 0x000000ff;
Amask = 0xff000000;
SDL_Surface *icon = SDL_CreateRGBSurfaceFrom((void *)ProgramIcon->Memory, ProgramIcon->Width, ProgramIcon->Height, ProgramIcon->BytesPerPixel * 8, ProgramIcon->BytesPerPixel * ProgramIcon->Width, Rmask, Gmask, Bmask, Amask);
SDL_Surface *icon = SDL_CreateRGBSurfaceWithFormatFrom((void *)ProgramIcon->Memory, ProgramIcon->Width, ProgramIcon->Height, ProgramIcon->BytesPerPixel * 8, ProgramIcon->BytesPerPixel * ProgramIcon->Width, SDL_PIXELFORMAT_ARGB8888);
if(icon) {
SDL_SetWindowIcon(Window, icon);
SDL_FreeSurface(icon);
@@ -814,7 +795,8 @@ S32 main(S32 argc, char *argv[])
ProgramIconBuffer.Width = ProgramIcon.Width;
ProgramIconBuffer.Height = ProgramIcon.Height;
ProgramIconBuffer.BytesPerPixel = 4;
ProgramIconBuffer.Pitch = 4 * ProgramIcon.Width;
ProgramIconBuffer.Pitch = ProgramIconBuffer.BytesPerPixel * ProgramIcon.Width;
memset(ProgramIconBuffer.Memory, 0, (ProgramIcon.Width * ProgramIcon.Height) * ProgramIconBuffer.BytesPerPixel);
DrawBitmap(&ProgramIconBuffer, &ProgramIcon, 0, 0, 0, 0);
SDLSetProgramIcon(Window, &ProgramIconBuffer);