Mercurial > hg > dmlib
view src/dmimage.c @ 1015:5101766dd95c
Error handling consistency.
author | Matti Hamalainen <ccr@tnsp.org> |
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date | Sun, 01 Mar 2015 04:46:23 +0200 |
parents | 1ffc48d0feaf |
children | c71fcf44b678 |
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/* * DMLib * -- Bitmap image conversion and loading * Programmed and designed by Matti 'ccr' Hamalainen * (C) Copyright 2012-2015 Tecnic Software productions (TNSP) */ #include "dmimage.h" #include "dmzlib.h" #define STBI_NO_FAILURE_STRINGS 1 #define STBI_FAILURE_USERMSG 1 #define STB_IMAGE_IMPLEMENTATION 1 #define STBI_NO_STDIO 1 #define STBI_NO_HDR 1 #define STBI_MALLOC(sz) dmMalloc(sz) #define STBI_REALLOC(p,sz) dmRealloc(p,sz) #define STBI_FREE(p) dmFree(p) #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) { // Create source surface from given data SDL_Surface *tmp = SDL_CreateRGBSurfaceFrom(data, width, height, depth, pitch, bmask, gmask, rmask, amask); // Result surface component orders as masks #if SDL_BYTEORDER == SDL_BIG_ENDIAN Uint32 Xrmask = 0xff000000, Xgmask = 0x00ff0000, Xbmask = 0x0000ff00, Xamask = 0x000000ff; #else Uint32 Xrmask = 0x000000ff, Xgmask = 0x0000ff00, Xbmask = 0x00ff0000, Xamask = 0xff000000; #endif // Create result conversion surface SDL_Surface *result = NULL, *pixtmp = SDL_CreateRGBSurface( SDL_SWSURFACE | SDL_SRCALPHA, 16, 16, 32, Xrmask, Xgmask, Xbmask, Xamask); if (tmp != NULL && pixtmp != NULL) { // Convert surface 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, 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 = 0, height = 0, comp = 0; Uint8 *data; data = stbi_load_from_callbacks(&dmSTBICallbacks, file, &width, &height, &comp, 0); if (data == NULL) { dmError(DMERR_DATA_ERROR, "Error decoding image resource %p '%s' [%d, %d, %d]: %s\n", file, file->filename, width, height, comp, stbi_failure_reason()); return NULL; } switch (comp) { case 4: #if SDL_BYTEORDER == SDL_BIG_ENDIAN rmask = 0xff000000; gmask = 0x00ff0000; bmask = 0x0000ff00; amask = 0x000000ff; #else rmask = 0x000000ff; gmask = 0x0000ff00; bmask = 0x00ff0000; amask = 0xff000000; #endif result = dmCreateRGBSurfaceFrom(data, width, height, comp * 8, width * comp, rmask, gmask, bmask, amask); break; case 3: #if SDL_BYTEORDER == SDL_BIG_ENDIAN rmask = 0x00ff0000; gmask = 0x0000ff00; bmask = 0x000000ff; amask = 0x00000000; #else rmask = 0x000000ff; gmask = 0x0000ff00; bmask = 0x00ff0000; amask = 0x00000000; #endif 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(DMERR_DATA_ERROR, "Format conversion failed for image resource %p '%s' [%d, %d, %d].\n", file, file->filename, width, height, comp); } return result; }