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Implement read callback for libpng

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This commit is contained in:
Pavel Krajcevski 2012-08-27 11:50:19 -04:00
parent cc7e8c1b1f
commit d13190990e
1 changed files with 16 additions and 5 deletions
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19
IO/ImageLoaderPNG.cpp
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@ -5,6 +5,10 @@
#include <png.h> #include <png.h>
static void ReportError(const char *msg) {
fprintf(stderr, "ERROR: ImageLoaderPNG -- %s\n", msg);
}
class PNGStreamReader { class PNGStreamReader {
public: public:
static void ReadDataFromStream( static void ReadDataFromStream(
@ -12,23 +16,30 @@ public:
png_bytep outBytes, png_bytep outBytes,
png_size_t byteCountToRead png_size_t byteCountToRead
) { ) {
png_voidp io_ptr = png_get_io_ptr( png_ptr );
if( io_ptr == NULL ) {
ReportError("Read callback had invalid io pointer.\n");
return;
}
ImageLoaderPNG &loader = *(ImageLoaderPNG *)(io_ptr);
const unsigned char *stream = &(loader.m_RawData[loader.m_StreamPosition]);
memcpy(outBytes, stream, byteCountToRead);
loader.m_StreamPosition += byteCountToRead;
} }
}; };
ImageLoaderPNG::ImageLoaderPNG(const unsigned char *rawData) ImageLoaderPNG::ImageLoaderPNG(const unsigned char *rawData)
: ImageLoader(rawData) : ImageLoader(rawData)
, m_StreamPosition(8) // We start at position 8 because of PNG header.
{ {
} }
ImageLoaderPNG::~ImageLoaderPNG() { ImageLoaderPNG::~ImageLoaderPNG() {
} }
static void ReportError(const char *msg) {
fprintf(stderr, "ERROR: ImageLoaderPNG -- %s\n", msg);
}
bool ImageLoaderPNG::ReadData() { bool ImageLoaderPNG::ReadData() {
const int kNumSigBytesToRead = 8; const int kNumSigBytesToRead = 8;