bool Image::writePNGMem( unsigned char **out, size_t *outsize ) {
assertmsg( buffer!=0 , "image not initialized?" );
assertmsg( width <= 2048 && height <= 2048, "image too big" );
unsigned error;
error = lodepng_encode32( out, outsize, buffer, width, height );
if(error) {
fprintf(stderr, "lodepng_encode32_file failed%d", error );
return false;
}
return true;
}
int LodePngCoder::Encode(unsigned char** out, int* outsize, const unsigned char* image, unsigned w, unsigned h) {
if (!image) return -1;
int res = lodepng_encode32(out,(size_t *)outsize, image, w, h);
if (res != 0) {
LOG_I( "[LodePngCoder] fail to encode png, error:%d, %s", res, lodepng_error_text(res));
}
return res;
}
/*
Example 2
Encode from raw pixels to an in-memory PNG file first, then write it to disk
The image argument has width * height RGBA pixels or width * height * 4 bytes
*/
void encodeTwoSteps(const char* filename, const unsigned char* image, unsigned width, unsigned height)
{
unsigned char* png;
size_t pngsize;
unsigned error = lodepng_encode32(&png, &pngsize, image, width, height);
if(!error) lodepng_save_file(png, pngsize, filename);
/*if there's an error, display it*/
if(error) printf("error %u: %s\n", error, lodepng_error_text(error));
free(png);
}
unsigned int Image::writePNG(std::string filename) {
unsigned char* png;
size_t pngsize;
unsigned error = lodepng_encode32(&png, &pngsize, pixels, width, height);
if(!error) lodepng_save_file(png, pngsize, filename.c_str());
/*if there's an error, display it*/
if (error) {
DEBUG("error " << error << ": " << lodepng_error_text(error));
}
free(png);
return 0;
}
static bool icvEncodePng32(std::string* dst, const char* data, int size, int width, int height, int width_step/*=0*/) {
if(dst == NULL || data == NULL || size <= 0) {
return false;
}
if(width <= 0 || height <= 0) {
return false;
}
if(width_step < width*4) {
width_step = width*4;
}
std::string tmp;
const char* pSrcData = data;
if(width_step > width*4) {
tmp.resize(width*height*4);
for(int i = 0; i < height; ++i) {
char* ppTmp = (char*)tmp.data() + i*width*4;
char* ppSrc = (char*)data + i*width_step;
memcpy(ppTmp, ppSrc, width*4);
}
pSrcData = tmp.data();
}
unsigned char* png;
size_t pngsize;
unsigned err = lodepng_encode32(&png, &pngsize, (const unsigned char*)pSrcData, width, height);
if(err != 0) return false;
dst->assign((const char*)png, pngsize);
free(png);
return true;
}
