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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "rwbase.h"
#include "rwerror.h"
#include "rwplg.h"
#include "rwpipeline.h"
#include "rwobjects.h"
#include "rwengine.h"
#include "lodepng/lodepng.h"
#define PLUGIN_ID 0
namespace rw {
Image*
readPNG(const char *filename)
{
Image *image = nil;
uint32 length;
uint8 *data = getFileContents(filename, &length);
assert(data != nil);
LodePNGState state;
lodepng_state_init(&state);
uint8 *raw = nil;
uint32 w, h;
// First try: decode without conversion to see if we understand the format
state.decoder.color_convert = 0;
uint32 error = lodepng_decode(&raw, &w, &h, &state, data, length);
if(error){
RWERROR((ERR_GENERAL, lodepng_error_text(error)));
return nil;
}
if(state.info_raw.bitdepth == 4 && state.info_raw.colortype == LCT_PALETTE){
image = Image::create(w, h, 4);
image->allocate();
memcpy(image->palette, state.info_raw.palette, state.info_raw.palettesize*4);
expandPal4_BE(image->pixels, image->stride, raw, w/2, w, h);
}else if(state.info_raw.bitdepth == 8){
switch(state.info_raw.colortype){
case LCT_PALETTE:
image = Image::create(w, h, state.info_raw.palettesize <= 16 ? 4 : 8);
image->allocate();
memcpy(image->palette, state.info_raw.palette, state.info_raw.palettesize*4);
memcpy(image->pixels, raw, w*h);
break;
case LCT_RGB:
image = Image::create(w, h, 24);
image->allocate();
memcpy(image->pixels, raw, w*h*3);
break;
default:
// Second try: just load as 32 bit
free(raw);
lodepng_state_init(&state);
error = lodepng_decode(&raw, &w, &h, &state, data, length);
if(error){
RWERROR((ERR_GENERAL, lodepng_error_text(error)));
return nil;
}
// fall through
case LCT_RGBA:
image = Image::create(w, h, 32);
image->allocate();
memcpy(image->pixels, raw, w*h*4);
break;
}
}
free(raw); // TODO: maybe override lodepng allocator
return image;
}
void
writePNG(Image *image, const char *filename)
{
int32 i;
StreamFile file;
if(!file.open(filename, "wb")){
RWERROR((ERR_FILE, filename));
return;
}
size_t rawsize;
uint8 *raw = nil;
uint8 *pixels;
LodePNGState state;
lodepng_state_init(&state);
pixels = image->pixels;
switch(image->depth){
case 4:
state.info_raw.bitdepth = 4;
state.info_raw.colortype = LCT_PALETTE;
state.info_png.color.bitdepth = 4;
state.info_png.color.colortype = LCT_PALETTE;
state.encoder.auto_convert = 0;
for(i = 0; i < (1<<image->depth); i++){
uint8 *col = &image->palette[i*4];
lodepng_palette_add(&state.info_png.color, col[0], col[1], col[2], col[3]);
lodepng_palette_add(&state.info_raw, col[0], col[1], col[2], col[3]);
}
pixels = rwNewT(uint8, image->width/2*image->height, ID_IMAGE | MEMDUR_FUNCTION);
compressPal4_BE(pixels, image->width/2, image->pixels, image->width, image->width, image->height);
break;
case 8:
state.info_raw.colortype = LCT_PALETTE;
state.info_png.color.colortype = LCT_PALETTE;
state.encoder.auto_convert = 0;
for(i = 0; i < (1<<image->depth); i++){
uint8 *col = &image->palette[i*4];
lodepng_palette_add(&state.info_png.color, col[0], col[1], col[2], col[3]);
lodepng_palette_add(&state.info_raw, col[0], col[1], col[2], col[3]);
}
break;
case 16:
// Don't think we can have 16 bits with PNG
// TODO: don't change original image
image->convertTo32();
break;
case 24:
state.info_raw.colortype = LCT_RGB;
state.info_png.color.colortype = LCT_RGB;
state.encoder.auto_convert = 0;
break;
case 32:
// already done
break;
}
uint32 error = lodepng_encode(&raw, &rawsize, pixels, image->width, image->height, &state);
if(error){
RWERROR((ERR_GENERAL, lodepng_error_text(error)));
return;
}
if(pixels != image->pixels)
rwFree(pixels);
file.write8(raw, rawsize);
file.close();
free(raw);
}
}
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