Mercurial > hg > dmlib
view dmimage.c @ 510:43ea59887c69
Start work on making C64 formats encoding possible by changing DMDecodeOps
to DMEncDecOps and adding fields and op enums for custom encode functions, renaming,
etc. Split generic op sanity checking into a separate function in
preparation for its use in generic encoding function.
author | Matti Hamalainen <ccr@tnsp.org> |
---|---|
date | Mon, 19 Nov 2012 15:06:01 +0200 |
parents | 32250b436bca |
children | dd59a650a318 |
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/* * DMLib * -- Bitmap image conversion and loading * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2012 Tecnic Software productions (TNSP) */ #include "dmimage.h" #define STBI_FAILURE_USERMSG 1 #define STBI_NO_STDIO 1 #define STBI_NO_HDR 1 #include "stb_image.c" SDL_Surface *dmCreateRGBSurfaceFrom(void *data, const int width, const int height, const int depth, const int pitch, const int rmask, const int gmask, const int bmask, const int amask) { SDL_Surface *tmp, *pixtmp, *result = NULL; tmp = SDL_CreateRGBSurfaceFrom(data, width, height, depth, pitch, bmask, gmask, rmask, amask); pixtmp = SDL_CreateRGBSurface(SDL_SWSURFACE | SDL_SRCALPHA, 10, 10, 32, rmask, gmask, bmask, amask); if (tmp != NULL && pixtmp != NULL) { result = SDL_ConvertSurface(tmp, pixtmp->format, SDL_SWSURFACE | SDL_SRCALPHA); SDL_FreeSurface(tmp); } if (pixtmp != NULL) SDL_FreeSurface(pixtmp); return result; } SDL_Surface *dmCreatePaletteSurfaceFrom(void *data, const int width, const int height, const int pitch) { int yc; Uint8 *dst, *src; SDL_Surface *result; result = SDL_CreateRGBSurface(SDL_SWSURFACE, width, height, 8, 0,0,0,0); if (result == NULL) return NULL; dst = result->pixels; src = data; for (yc = 0; yc < height; yc++) { memcpy(dst, src, width * sizeof(Uint8)); dst += result->pitch; src += pitch; } return result; } static int dmSTBIread(void *user, char *data, int size) { return dmfread(data, 1, size, (DMResource *) user); } static void dmSTBIskip(void *user, unsigned int n) { dmfseek((DMResource *) user, n, SEEK_CUR); } static int dmSTBIeof(void *user) { return dmfeof((DMResource *) user); } static const stbi_io_callbacks dmSTBICallbacks = { dmSTBIread, dmSTBIskip, dmSTBIeof, }; SDL_Surface *dmLoadImage(DMResource *file) { Uint32 rmask, gmask, bmask, amask; SDL_Surface *result = NULL; int width, height, comp; Uint8 *data; data = stbi_load_from_callbacks(&dmSTBICallbacks, file, &width, &height, &comp, 0); if (data == NULL) { dmError("Error decoding image resource %p '%s' [%d, %d, %d]: %s\n", file, file->filename, width, height, comp, stbi_failure_reason()); return NULL; } #if SDL_BYTEORDER == SDL_BIG_ENDIAN rmask = 0xff000000; gmask = 0x00ff0000; bmask = 0x0000ff00; amask = 0x000000ff; #else rmask = 0x000000ff; gmask = 0x0000ff00; bmask = 0x00ff0000; amask = 0xff000000; #endif switch (comp) { case 4: case 3: result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, width * comp, rmask, gmask, bmask, amask); break; case 1: result = dmCreatePaletteSurfaceFrom(data, width, height, width * comp); break; } stbi_image_free(data); if (result == NULL) { dmError("Format conversion failed for image resource %p '%s' [%d, %d, %d].\n", file, file->filename, width, height, comp); } return result; }