u8 *BAG_Display_LoadPng(const char *filename, int *wd, int *ht){
u8* buffer = NULL;
u8* image = NULL;
size_t buffersize = 0, imagesize = 0;
LodePNG_Decoder pngDecoder;
memset(&pngDecoder, 0, sizeof(LodePNG_Decoder));
if(!LodePNG_loadFile ( &buffer, &buffersize, filename )){
LodePNG_Decoder_init (&pngDecoder);
LodePNG_decode( &pngDecoder, &image, &imagesize, buffer, buffersize ); /*decode the png*/
*wd = pngDecoder.infoPng.width;
*ht = pngDecoder.infoPng.height;
//_png_fillBuffer(object, image);
}
else{
//BAG_DBG_LibMsg(OPEN_FAIL_MSG, filename);
printf("Error opening png file: %s\n", filename);
if(image) free(image);
image = NULL;
}
end:
LodePNG_Decoder_cleanup(&pngDecoder);
if(buffer) free(buffer);
return image;
}
unsigned char *RasterMapManager::DecodePNG(unsigned char *readBuffer, unsigned int length, unsigned int& width, unsigned int& height) {
static unsigned char* image = 0;
if (image != 0) {
free(image);
}
size_t dummy_size;
LodePNG_Decoder decoder;
LodePNG_Decoder_init(&decoder);
decoder.infoRaw.color.colorType = 2;
LodePNG_decode(&decoder, &image, &dummy_size, &readBuffer[0], length);
unsigned int error = decoder.error;
width = decoder.infoPng.width;
height = decoder.infoPng.height;
LodePNG_Decoder_cleanup(&decoder);
if (error) {
printf("RasterMapManager: PNG codec error number %d\n", error);
return NULL;
}
return image;
}
static GLuint LoadTexture(const char* filename)
{
unsigned char* buffer;
unsigned char* image;
size_t buffersize, imagesize;
LodePNG_Decoder decoder;
LodePNG_loadFile(&buffer, &buffersize, filename);
LodePNG_Decoder_init(&decoder);
decoder.infoRaw.color.colorType = 0;
decoder.infoRaw.color.bitDepth = 8;
LodePNG_Decoder_decode(&decoder, &image, &imagesize, buffer, buffersize);
pezCheck(!decoder.error, "error %u: %s\n", decoder.error, LodePNG_error_text(decoder.error));
int bpp = LodePNG_InfoColor_getBpp(&decoder.infoPng.color);
int bitDepth = decoder.infoPng.color.bitDepth;
int colorChannels = LodePNG_InfoColor_getChannels(&decoder.infoPng.color);
pezCheck(bpp == 8 && bitDepth == 8 && colorChannels == 1);
int w = decoder.infoPng.width;
int h = decoder.infoPng.height;
pezPrintString("Loaded %s (%d x %d) bufferSize = %d, imageSize = %d\n", filename, w, h, buffersize, imagesize);
GLuint handle;
glGenTextures(1, &handle);
glBindTexture(GL_TEXTURE_2D, handle);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glPixelStorei(GL_PACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, image);
free(buffer);
free(image);
LodePNG_Decoder_cleanup(&decoder);
pezCheck(OpenGLError);
return handle;
}