Mercurial > hg > dmlib
view dmimage.c @ 49:033c660c25f5
Restructure module playing, removing 8bit sample mixing (output can still be
8bit, but samples are internally upconverted to 16bit after module loading.)
Also prepare for floating point mixing support.
author | Matti Hamalainen <ccr@tnsp.org> |
---|---|
date | Mon, 01 Oct 2012 02:51:41 +0300 |
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; }