CWE-ou-minkata/Sources/Plasma/PubUtilLib/plGImage/plPNG.cpp

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.

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combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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*==LICENSE==*/

#include "hsTypes.h"
#include "hsStream.h"
#include "hsExceptions.h"
#include "hsUtils.h"
#include "plPNG.h"
#include "../plGImage/plMipmap.h"

#include <png.h>
#define PNGSIGSIZE 8

//	Custom functions to read and write data from or to an hsStream
//	used by libPNG's respective functions
void pngReadDelegate(png_structp png_ptr, png_bytep png_data, png_size_t length)
{
	hsStream* inStream = (hsStream*)png_get_io_ptr(png_ptr);
	inStream->Read(length, (UInt8*)png_data);
}

void pngWriteDelegate(png_structp png_ptr, png_bytep png_data, png_size_t length)
{
	hsStream* outStream = (hsStream*)png_get_io_ptr(png_ptr);
	outStream->Write(length, (UInt8*)png_data);
}

//// Singleton Instance ///////////////////////////////////////////////////////

plPNG& plPNG::Instance(void)
{
	static plPNG theInstance;
	return theInstance;
}

//// IRead ////////////////////////////////////////////////////////////////////
//	Given an open hsStream, reads the PNG data off of the
//	stream and decodes it into a new plMipmap. The mipmap's buffer ends up
//	being a packed RGBA buffer.
//	Returns a pointer to the new mipmap if successful, NULL otherwise.

plMipmap* plPNG::IRead(hsStream* inStream)
{
	plMipmap* newMipmap = NULL;
	png_structp png_ptr;
	png_infop info_ptr;
	png_infop end_info;

	try {
		//	Check PNG Signature
		png_byte sig[PNGSIGSIZE];
		inStream->Read8Bytes((char*) sig);

		if (!png_sig_cmp(sig, 0, PNGSIGSIZE)) {
			//	Allocate required structs
			png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

			if (!png_ptr) {
				throw(false);
			}

			info_ptr = png_create_info_struct(png_ptr);

			if (!info_ptr) {
				png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
				throw(false);
			}

			end_info = png_create_info_struct(png_ptr);

			if (!end_info) {
				png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
				throw(false);
			}

			//	Assign delegate function for reading from hsStream
			png_set_read_fn(png_ptr, (png_voidp)inStream, pngReadDelegate);
			//	Get PNG Header information
			png_set_sig_bytes(png_ptr, PNGSIGSIZE);
			png_read_info(png_ptr, info_ptr);
			png_uint_32 imgWidth =	png_get_image_width(png_ptr, info_ptr);
			png_uint_32 imgHeight = png_get_image_height(png_ptr, info_ptr);
			png_uint_32 bitdepth   = png_get_bit_depth(png_ptr, info_ptr);
			png_uint_32 channels   = png_get_channels(png_ptr, info_ptr);
			png_uint_32 color_type = png_get_color_type(png_ptr, info_ptr);

			//	Convert images to RGB color space
			switch (color_type) {
				case PNG_COLOR_TYPE_PALETTE:
					png_set_palette_to_rgb(png_ptr);
					channels = 3;
					break;
				case PNG_COLOR_TYPE_GRAY:

					if (bitdepth < 8) {
						png_set_expand_gray_1_2_4_to_8(png_ptr);
					}

					bitdepth = 8;
					break;
			}

			//	Convert transparency (if needed) to a full alpha channel
			if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
				png_set_tRNS_to_alpha(png_ptr);
				channels += 1;
			} else if (channels == 3) {
				// Add an opaque alpha channel if still none exists
				png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
				channels = 4;
			}

			// Invert color byte-order as used by plMipmap for DirectX
			png_set_bgr(png_ptr);
			/// Construct a new mipmap to hold everything
			newMipmap = TRACKED_NEW plMipmap(imgWidth, imgHeight, plMipmap::kARGB32Config, 1, plMipmap::kUncompressed);
			char* destp = (char*)newMipmap->GetImage();
			png_bytep* row_ptrs = TRACKED_NEW png_bytep[imgHeight];
			const unsigned int stride = imgWidth * bitdepth * channels / 8;

			//	Assign row pointers to the appropriate locations in the newly-created Mipmap
			for (size_t i = 0; i < imgHeight; i++) {
				row_ptrs[i] = (png_bytep)destp + (i * stride);
			}

			png_read_image(png_ptr, row_ptrs);
			png_read_end(png_ptr, end_info);
			//	Clean up allocated structs
			png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
			delete [] row_ptrs;
		}
	} catch (...) {
		if (newMipmap != NULL) {
			delete newMipmap;
			newMipmap = NULL;
		}
	}

	return newMipmap;
}

plMipmap* plPNG::ReadFromFile(const char* fileName)
{
	wchar* wFilename = hsStringToWString(fileName);
	plMipmap* retVal = ReadFromFile(wFilename);
	delete [] wFilename;
	return retVal;
}

plMipmap* plPNG::ReadFromFile(const wchar* fileName)
{
	hsUNIXStream in;

	if (!in.Open(fileName, L"rb")) {
		return false;
	}

	plMipmap* ret = IRead(&in);
	in.Close();
	return ret;
}

hsBool plPNG::IWrite(plMipmap* source, hsStream* outStream)
{
	hsBool result = true;

	try {
		//	Allocate required structs
		png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

		if (!png_ptr) {
			throw(false);
		}

		png_infop info_ptr = png_create_info_struct(png_ptr);

		if (!info_ptr) {
			png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
			throw(false);
		}

		//	Assign delegate function for writing to hsStream
		png_set_write_fn(png_ptr, (png_voidp)outStream, pngWriteDelegate, NULL);
		UInt8 psize = source->GetPixelSize();
		png_set_IHDR(png_ptr, info_ptr, source->GetWidth(), source->GetHeight(), 8, PNG_COLOR_TYPE_RGB_ALPHA,
					 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
		// Invert color byte-order as used by plMipmap for DirectX
		png_set_bgr(png_ptr);
		// Write out the image metadata
		png_write_info(png_ptr, info_ptr);
		char* srcp = (char*)source->GetImage();
		png_bytep* row_ptrs = TRACKED_NEW png_bytep[source->GetHeight()];
		const unsigned int stride = source->GetWidth() * source->GetPixelSize() / 8;

		//	Assign row pointers to the appropriate locations in the newly-created Mipmap
		for (size_t i = 0; i < source->GetHeight(); i++) {
			row_ptrs[i] = (png_bytep)srcp + (i * stride);
		}

		png_write_image(png_ptr, row_ptrs);
		png_write_end(png_ptr, info_ptr);
		//	Clean up allocated structs
		png_destroy_write_struct(&png_ptr, &info_ptr);
		delete [] row_ptrs;
	} catch (...) {
		result = false;
	}

	return result;
}

hsBool plPNG::WriteToFile(const char* fileName, plMipmap* sourceData)
{
	wchar* wFilename = hsStringToWString(fileName);
	hsBool retVal = WriteToFile(wFilename, sourceData);
	delete [] wFilename;
	return retVal;
}

hsBool plPNG::WriteToFile(const wchar* fileName, plMipmap* sourceData)
{
	hsUNIXStream out;

	if (!out.Open(fileName, L"wb")) {
		return false;
	}

	hsBool ret = IWrite(sourceData, &out);
	out.Close();
	return ret;
}