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| 1 | #include "imageio.h" |
| 2 | |
| 3 | #include <SDL_image.h> |
| 4 | |
| 5 | SDL_Surface *loadPNG(const std::string &path) { |
| 6 | // Load PNG file into an SDL surface. |
| 7 | SDL_Surface *surface = IMG_Load(path.c_str()); |
| 8 | if (!surface) { |
| 9 | return NULL; |
| 10 | } |
| 11 | |
| 12 | // Make sure we have a surface that can be blitted using alpha blending. |
| 13 | if (surface->format->BytesPerPixel == 4) { |
| 14 | SDL_SetAlpha(surface, SDL_SRCALPHA, 255); |
| 15 | return surface; |
| 16 | } else { |
| 17 | SDL_PixelFormat format32; |
| 18 | memset(&format32, 0, sizeof(format32)); |
| 19 | format32.BitsPerPixel = 32; |
| 20 | format32.BytesPerPixel = 4; |
| 21 | format32.Rmask = |
| 22 | SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0x00FF0000 : 0x000000FF; |
| 23 | format32.Gmask = 0x0000FF00; |
| 24 | format32.Bmask = |
| 25 | SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0x000000FF : 0x00FF0000; |
| 26 | format32.Amask = 0xFF000000; |
| 27 | format32.Rshift = SDL_BYTEORDER == SDL_BIG_ENDIAN ? 16 : 0; |
| 28 | format32.Gshift = 8; |
| 29 | format32.Bshift = SDL_BYTEORDER == SDL_BIG_ENDIAN ? 0 : 16; |
| 30 | format32.Ashift = 24; |
| 31 | SDL_Surface *surface32 = |
| 32 | SDL_ConvertSurface(surface, &format32, SDL_SRCALPHA); |
| 33 | SDL_FreeSurface(surface); |
| 34 | return surface32; |
| 35 | } |
| 36 | } |
| 37 |
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