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/*
* (C) Gražvydas "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;
}
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