/***********************************************************************
* decode png stream
***********************************************************************/
static int32_t decode_png_stream(png_dec_info *dec_ctx, void *buf)
{
uint32_t ret = 0;
uint8_t *out;
CellPngDecDataCtrlParam param;
CellPngDecDataOutInfo info;
param.outputBytesPerLine = png_w * 4;
out = (void*)buf;
memset(out, 0, (png_w * png_h * 4));
// decode png...
ret = PngDecDecodeData(dec_ctx->main_h, dec_ctx->sub_h, out, ¶m, &info);
return ret;
}
int LoadPNG(PngDatas *png, char *filename)
{
int ret=-1;
int mHandle;
int sHandle;
PngDecThreadInParam InThdParam;
PngDecThreadOutParam OutThdParam;
uint64_t build_malloc, build_free; // used to create the fake 32 bits addrs .opd for functions png_malloc() and png_free()
PngDecInParam inParam;
PngDecOutParam outParam;
PngDecSrc src;
uint32_t space_allocated;
PngDecInfo DecInfo;
uint64_t bytes_per_line;
PngDecDataInfo DecDataInfo;
InThdParam.enable = 0;
InThdParam.ppu_prio = 512;
InThdParam.spu_prio = 200;
InThdParam.addr_malloc_func = build32_func_addr(png_malloc, &build_malloc); // (see sysmodule.h)
InThdParam.addr_malloc_arg = 0; // no args: if you want one uses get32_addr() to get the 32 bit address (see sysmodule.h)
InThdParam.addr_free_func = build32_func_addr(png_free, &build_free); // (see sysmodule.h)
InThdParam.addr_free_arg = 0; // no args if you want one uses get32_addr() to get the 32 bit address (see sysmodule.h)
ret= PngDecCreate(&mHandle, &InThdParam, &OutThdParam);
png->bmp_out= NULL;
if(ret == 0) {
memset(&src, 0, sizeof(PngDecSrc));
if(filename) {
src.stream_select = PNGDEC_FILE;
src.addr_file_name = get32_addr(filename);
} else {
src.stream_select = PNGDEC_BUFFER;
src.addr_stream_ptr = get32_addr((void *) png->png_in);
src.stream_size = png->png_size;
}
src.enable = PNGDEC_DISABLE;
ret= PngDecOpen(mHandle, &sHandle, &src, &space_allocated);
if(ret == 0) {
ret = PngDecReadHeader(mHandle, sHandle, &DecInfo);
if(ret == 0) {
inParam.addr_cmd_ptr = 0;
inParam.mode = PNGDEC_TOP_TO_BOTTOM;
inParam.color_space = PNGDEC_ARGB;
inParam.bit_depth = 8;
inParam.pack_flag = 1;
if((DecInfo.color_space == PNGDEC_GRAYSCALE_ALPHA) || (DecInfo.color_space == PNGDEC_RGBA) || (DecInfo.chunk_info & 0x10))
inParam.alpha_select = 0;
else
inParam.alpha_select = 1;
inParam.color_alpha = 0xff;
ret = PngDecSetParameter(mHandle, sHandle, &inParam, &outParam);
}
if(ret == 0) {
png->wpitch= outParam.width* 4;
bytes_per_line = (uint64_t) png->wpitch;
png->bmp_out= malloc(png->wpitch * outParam.height);
if(!png->bmp_out) {
ret=-1; // out of memory
} else {
memset(png->bmp_out, 0, png->wpitch * outParam.height);
ret = PngDecDecodeData(mHandle, sHandle, png->bmp_out, &bytes_per_line, &DecDataInfo);
if((ret == 0) && (DecDataInfo.status == 0)){
png->width = outParam.width;
png->height = outParam.height;
ret=0; // ok :)
}
}
}
PngDecClose(mHandle, sHandle);
}
if(ret && png->bmp_out) {
free(png->bmp_out); png->bmp_out= NULL;
}
PngDecDestroy(mHandle);
}
return ret;
}
