diff options
Diffstat (limited to 'frontend/common/readpng.c')
| -rw-r--r-- | frontend/common/readpng.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/frontend/common/readpng.c b/frontend/common/readpng.c new file mode 100644 index 0000000..b7bad57 --- /dev/null +++ b/frontend/common/readpng.c @@ -0,0 +1,193 @@ +/* + * (C) GraÅžvydas "notaz" Ignotas, 2008-2010 + * + * This work is licensed under the terms of any of these licenses + * (at your option): + * - GNU GPL, version 2 or later. + * - GNU LGPL, version 2.1 or later. + * See the COPYING file in the top-level directory. + */ + +#include <stdio.h> +#include <string.h> +#include <png.h> +#include "readpng.h" +#include "lprintf.h" + +int readpng(void *dest, const char *fname, readpng_what what, int req_w, int req_h) +{ + FILE *fp; + png_structp png_ptr = NULL; + png_infop info_ptr = NULL; + png_bytepp row_ptr = NULL; + int ret = -1; + + if (dest == NULL || fname == NULL) + { + return -1; + } + + fp = fopen(fname, "rb"); + if (fp == NULL) + { + lprintf(__FILE__ ": failed to open: %s\n", fname); + return -1; + } + + png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); + if (!png_ptr) + { + lprintf(__FILE__ ": png_create_read_struct() failed\n"); + fclose(fp); + return -1; + } + + info_ptr = png_create_info_struct(png_ptr); + if (!info_ptr) + { + lprintf(__FILE__ ": png_create_info_struct() failed\n"); + goto done; + } + + // Start reading + png_init_io(png_ptr, fp); + png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL); + row_ptr = png_get_rows(png_ptr, info_ptr); + if (row_ptr == NULL) + { + lprintf(__FILE__ ": png_get_rows() failed\n"); + goto done; + } + + // lprintf("%s: %ix%i @ %ibpp\n", fname, (int)info_ptr->width, (int)info_ptr->height, info_ptr->pixel_depth); + + switch (what) + { + case READPNG_BG: + { + int height, width, h; + unsigned short *dst = dest; + if (info_ptr->pixel_depth != 24) + { + lprintf(__FILE__ ": bg image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth); + break; + } + height = info_ptr->height; + if (height > req_h) + height = req_h; + width = info_ptr->width; + if (width > req_w) + width = req_w; + + for (h = 0; h < height; h++) + { + unsigned char *src = row_ptr[h]; + int len = width; + while (len--) + { +#ifdef PSP + *dst++ = ((src[2]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[0] >> 3); // BGR +#else + *dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); // RGB +#endif + src += 3; + } + dst += req_w - width; + } + break; + } + + case READPNG_FONT: + { + int x, y, x1, y1; + unsigned char *dst = dest; + if (info_ptr->width != req_w || info_ptr->height != req_h) + { + lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n", + (int)info_ptr->width, (int)info_ptr->height, req_w, req_h); + break; + } + if (info_ptr->pixel_depth != 8) + { + lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); + break; + } + for (y = 0; y < 16; y++) + { + for (x = 0; x < 16; x++) + { + /* 16x16 grid of syms */ + int sym_w = req_w / 16; + int sym_h = req_h / 16; + for (y1 = 0; y1 < sym_h; y1++) + { + unsigned char *src = row_ptr[y*sym_h + y1] + x*sym_w; + for (x1 = sym_w/2; x1 > 0; x1--, src+=2) + *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); + } + } + } + break; + } + + case READPNG_SELECTOR: + { + int x1, y1; + unsigned char *dst = dest; + if (info_ptr->width != req_w || info_ptr->height != req_h) + { + lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n", + (int)info_ptr->width, (int)info_ptr->height, req_w, req_h); + break; + } + if (info_ptr->pixel_depth != 8) + { + lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth); + break; + } + for (y1 = 0; y1 < req_h; y1++) + { + unsigned char *src = row_ptr[y1]; + for (x1 = req_w/2; x1 > 0; x1--, src+=2) + *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4); + } + break; + } + + case READPNG_24: + { + int height, width, h; + unsigned char *dst = dest; + if (info_ptr->pixel_depth != 24) + { + lprintf(__FILE__ ": image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth); + break; + } + height = info_ptr->height; + if (height > req_h) + height = req_h; + width = info_ptr->width; + if (width > req_w) + width = req_w; + + for (h = 0; h < height; h++) + { + int len = width; + unsigned char *src = row_ptr[h]; + dst += (req_w - width) * 3; + for (len = width; len > 0; len--, dst+=3, src+=3) + dst[0] = src[2], dst[1] = src[1], dst[2] = src[0]; + } + break; + } + } + + + ret = 0; +done: + png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL); + fclose(fp); + return ret; +} + + |