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- #include <stdio.h>
- #include <string.h>
- #include <png.h>
- #include "readpng.h"
- #include "lprintf.h"
- #ifdef PSP
- #define BG_WIDTH 480
- #define BG_HEIGHT 272
- #else
- #define BG_WIDTH 320
- #define BG_HEIGHT 240
- #endif
- int readpng(void *dest, const char *fname, readpng_what what)
- {
- 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 > BG_HEIGHT) height = BG_HEIGHT;
- width = info_ptr->width;
- if (width > BG_WIDTH) width = BG_WIDTH;
- 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 += BG_WIDTH - width;
- }
- break;
- }
- case READPNG_FONT:
- {
- int x, y, x1, y1;
- unsigned char *dst = dest;
- if (info_ptr->width != 128 || info_ptr->height != 160)
- {
- lprintf(__FILE__ ": unexpected font image size %ix%i, needed 128x160\n",
- (int)info_ptr->width, (int)info_ptr->height);
- 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++)
- {
- for (y1 = 0; y1 < 10; y1++)
- {
- unsigned char *src = row_ptr[y*10 + y1] + x*8;
- for (x1 = 8/2; 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 != 8 || info_ptr->height != 10)
- {
- lprintf(__FILE__ ": unexpected selector image size %ix%i, needed 8x10\n",
- (int)info_ptr->width, (int)info_ptr->height);
- 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 < 10; y1++)
- {
- unsigned char *src = row_ptr[y1];
- for (x1 = 8/2; x1 > 0; x1--, src+=2)
- *dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
- }
- break;
- }
- case READPNG_320_24:
- case READPNG_480_24:
- {
- int height, width, h;
- int needw = (what == READPNG_480_24) ? 480 : 320;
- 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 > 240) height = 240;
- width = info_ptr->width;
- if (width > needw) width = needw;
- for (h = 0; h < height; h++)
- {
- int len = width;
- unsigned char *src = row_ptr[h];
- dst += (needw - 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;
- }
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