From 1eb88d4f5d5cb05d62be1d4a0c88c7399f7c0de0 Mon Sep 17 00:00:00 2001
From: Chris Xiong <chirs241097@gmail.com>
Date: Sat, 3 Feb 2018 00:55:26 +0800
Subject: Added the GL 3.2+ port. Fixed poor performance of the truetype
 renderer. (Partially) Fixed texture locking. Minor addition and fixes to the
 math library.

---
 smelt/sdl/CxImage/ximapng.cpp | 644 ------------------------------------------
 1 file changed, 644 deletions(-)
 delete mode 100644 smelt/sdl/CxImage/ximapng.cpp

(limited to 'smelt/sdl/CxImage/ximapng.cpp')

diff --git a/smelt/sdl/CxImage/ximapng.cpp b/smelt/sdl/CxImage/ximapng.cpp
deleted file mode 100644
index db2f636..0000000
--- a/smelt/sdl/CxImage/ximapng.cpp
+++ /dev/null
@@ -1,644 +0,0 @@
-/*
- * File:	ximapng.cpp
- * Purpose:	Platform Independent PNG Image Class Loader and Writer
- * 07/Aug/2001 Davide Pizzolato - www.xdp.it
- * CxImage version 7.0.0 31/Dec/2010
- */
-
-#include "ximapng.h"
-
-#if CXIMAGE_SUPPORT_PNG
-
-#include "ximaiter.h"
-
-////////////////////////////////////////////////////////////////////////////////
-void CxImagePNG::ima_png_error(png_struct *png_ptr, char *message)
-{
-	strcpy(info.szLastError,message);
-#if PNG_LIBPNG_VER > 10399
-	longjmp(png_jmpbuf(png_ptr), 1);
-#else
-	longjmp(png_ptr->jmpbuf, 1);
-#endif
-}
-////////////////////////////////////////////////////////////////////////////////
-#if CXIMAGE_SUPPORT_DECODE
-////////////////////////////////////////////////////////////////////////////////
-void CxImagePNG::expand2to4bpp(uint8_t* prow)
-{
-	uint8_t *psrc,*pdst;
-	uint8_t pos,idx;
-	for(int32_t x=head.biWidth-1;x>=0;x--){
-		psrc = prow + ((2*x)>>3);
-		pdst = prow + ((4*x)>>3);
-		pos = (uint8_t)(2*(3-x%4));
-		idx = (uint8_t)((*psrc & (0x03<<pos))>>pos);
-		pos = (uint8_t)(4*(1-x%2));
-		*pdst &= ~(0x0F<<pos);
-		*pdst |= (idx & 0x0F)<<pos;
-	}
-}
-////////////////////////////////////////////////////////////////////////////////
-bool CxImagePNG::Decode(CxFile *hFile)
-{
-	png_struct *png_ptr;
-	png_info *info_ptr;
-	uint8_t *row_pointers=NULL;
-	CImageIterator iter(this);
-
-  cx_try
-  {
-    /* Create and initialize the png_struct with the desired error handler
-    * functions.  If you want to use the default stderr and longjump method,
-    * you can supply NULL for the last three parameters.  We also supply the
-    * the compiler header file version, so that we know if the application
-    * was compiled with a compatible version of the library.  REQUIRED    */
-	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,(void *)NULL,NULL,NULL);
-	if (png_ptr == NULL)  cx_throw("Failed to create PNG structure");
-
-	/* Allocate/initialize the memory for image information.  REQUIRED. */
-	info_ptr = png_create_info_struct(png_ptr);
-	if (info_ptr == NULL) {
-		png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
-		cx_throw("Failed to initialize PNG info structure");
-	}
-
-    /* Set error handling if you are using the setjmp/longjmp method (this is
-    * the normal method of doing things with libpng).  REQUIRED unless you
-    * set up your own error handlers in the png_create_read_struct() earlier. */
-#if PNG_LIBPNG_VER > 10399
-	if (setjmp(png_jmpbuf(png_ptr))) {
-#else
-	if (setjmp(png_ptr->jmpbuf)) {
-#endif
-		/* Free all of the memory associated with the png_ptr and info_ptr */
-		delete [] row_pointers;
-		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
-		cx_throw("");
-	}
-
-	// use custom I/O functions
-	png_set_read_fn(png_ptr, hFile, /*(png_rw_ptr)*/user_read_data);
-	png_set_error_fn(png_ptr,info.szLastError,/*(png_error_ptr)*/user_error_fn,NULL);
-
-	/* read the file information */
-	png_read_info(png_ptr, info_ptr);
-
-	png_uint_32 _width,_height;
-	int _bit_depth,_color_type,_interlace_type,_compression_type,_filter_type;
-#if PNG_LIBPNG_VER > 10399
-	png_get_IHDR(png_ptr,info_ptr,&_width,&_height,&_bit_depth,&_color_type,
-		&_interlace_type,&_compression_type,&_filter_type);
-#else
-	_width=info_ptr->width;
-	_height=info_ptr->height;
-	_bit_depth=info_ptr->bit_depth;
-	_color_type=info_ptr->color_type;
-	_interlace_type=info_ptr->interlace_type;
-	//_compression_type=info_ptr->compression_type;
-	//_filter_type=info_ptr->filter_type;
-#endif
-
-	if (info.nEscape == -1){
-		head.biWidth = _width;
-		head.biHeight= _height;
-		info.dwType = CXIMAGE_FORMAT_PNG;
-#if PNG_LIBPNG_VER > 10399
-		longjmp(png_jmpbuf(png_ptr), 1);
-#else
-		longjmp(png_ptr->jmpbuf, 1);
-#endif
-	}
-
-	/* calculate new number of channels */
-	int32_t channels=0;
-	switch(_color_type){
-	case PNG_COLOR_TYPE_GRAY:
-	case PNG_COLOR_TYPE_PALETTE:
-		channels = 1;
-		break;
-	case PNG_COLOR_TYPE_GRAY_ALPHA:
-		channels = 2;
-		break;
-	case PNG_COLOR_TYPE_RGB:
-		channels = 3;
-		break;
-	case PNG_COLOR_TYPE_RGB_ALPHA:
-		channels = 4;
-		break;
-	default:
-		strcpy(info.szLastError,"unknown PNG color type");
-#if PNG_LIBPNG_VER > 10399
-		longjmp(png_jmpbuf(png_ptr), 1);
-#else
-		longjmp(png_ptr->jmpbuf, 1);
-#endif
-	}
-
-	//find the right pixel depth used for cximage
-#if PNG_LIBPNG_VER > 10399
-	int pixel_depth = _bit_depth * png_get_channels(png_ptr,info_ptr);
-#else
-	int pixel_depth = info_ptr->pixel_depth;
-#endif
-	if (channels == 1 && pixel_depth>8) pixel_depth=8;
-	if (channels == 2) pixel_depth=8;
-	if (channels >= 3) pixel_depth=24;
-
-	if (!Create(_width, _height, pixel_depth, CXIMAGE_FORMAT_PNG)){
-#if PNG_LIBPNG_VER > 10399
-		longjmp(png_jmpbuf(png_ptr), 1);
-#else
-		longjmp(png_ptr->jmpbuf, 1);
-#endif
-	}
-
-	/* get metrics */
-	png_uint_32 _x_pixels_per_unit,_y_pixels_per_unit;
-	int _phys_unit_type;
-#if PNG_LIBPNG_VER > 10399
-	png_get_pHYs(png_ptr,info_ptr,&_x_pixels_per_unit,&_y_pixels_per_unit,&_phys_unit_type);
-#else
-	_x_pixels_per_unit=info_ptr->x_pixels_per_unit;
-	_y_pixels_per_unit=info_ptr->y_pixels_per_unit;
-	_phys_unit_type=info_ptr->phys_unit_type;
-#endif
-	switch (_phys_unit_type)
-	{
-	case PNG_RESOLUTION_UNKNOWN:
-		SetXDPI(_x_pixels_per_unit);
-		SetYDPI(_y_pixels_per_unit);
-		break;
-	case PNG_RESOLUTION_METER:
-		SetXDPI((long)floor(_x_pixels_per_unit * 254.0 / 10000.0 + 0.5));
-		SetYDPI((long)floor(_y_pixels_per_unit * 254.0 / 10000.0 + 0.5));
-		break;
-	}
-
-	int _num_palette;
-	png_colorp _palette;
-#if PNG_LIBPNG_VER > 10399
-	png_get_PLTE(png_ptr,info_ptr,&_palette,&_num_palette);
-#else
-	_num_palette=info_ptr->num_palette;
-	_palette=info_ptr->palette;
-#endif
-	if (_num_palette>0){
-		SetPalette((rgb_color*)_palette,_num_palette);
-		SetClrImportant(_num_palette);
-	} else if (_bit_depth ==2) { //<DP> needed for 2 bpp grayscale PNGs
-		SetPaletteColor(0,0,0,0);
-		SetPaletteColor(1,85,85,85);
-		SetPaletteColor(2,170,170,170);
-		SetPaletteColor(3,255,255,255);
-	} else SetGrayPalette(); //<DP> needed for grayscale PNGs
-
-	int nshift = max(0,(_bit_depth>>3)-1)<<3;
-
-	png_bytep _trans_alpha;
-	int _num_trans;
-	png_color_16p _trans_color;
-#if PNG_LIBPNG_VER > 10399
-	png_get_tRNS(png_ptr,info_ptr,&_trans_alpha,&_num_trans,&_trans_color);
-#else
-	_num_trans=info_ptr->num_trans;
-#endif
-	if (_num_trans!=0){ //palette transparency
-		if (_num_trans==1){
-			if (_color_type == PNG_COLOR_TYPE_PALETTE){
-				info.nBkgndIndex = _trans_color->index;
-			} else{
-				info.nBkgndIndex = _trans_color->gray>>nshift;
-			}
-		}
-		if (_num_trans>1){
-			RGBQUAD* pal=GetPalette();
-			if (pal){
-				uint32_t ip;
-				if(_trans_alpha != 0) {
-					for (ip=0;ip<min(head.biClrUsed,(unsigned long)_num_trans);ip++)
-						pal[ip].rgbReserved=_trans_alpha[ip];
-				}
-				for (ip=_num_trans;ip<head.biClrUsed;ip++){
-					pal[ip].rgbReserved=255;
-				}
-				info.bAlphaPaletteEnabled=true;
-			}
-		}
-	}
-
-	if (channels == 3){ //check RGB binary transparency
-		/* seems unnecessary to call again, but the conditional must be important so... */
-		if (png_get_tRNS(png_ptr,info_ptr,&_trans_alpha,&_num_trans,&_trans_color)){
-			info.nBkgndColor.rgbRed   = (uint8_t)(_trans_color->red>>nshift);
-			info.nBkgndColor.rgbGreen = (uint8_t)(_trans_color->green>>nshift);
-			info.nBkgndColor.rgbBlue  = (uint8_t)(_trans_color->blue>>nshift);
-			info.nBkgndColor.rgbReserved = 0;
-			info.nBkgndIndex = 0;
-		}
-	}
-
-	int32_t alpha_present = (channels - 1) % 2;
-	if (alpha_present){
-#if CXIMAGE_SUPPORT_ALPHA	// <vho>
-		AlphaCreate();
-#else
-		png_set_strip_alpha(png_ptr);
-#endif //CXIMAGE_SUPPORT_ALPHA
-	}
-
-	// <vho> - flip the RGB pixels to BGR (or RGBA to BGRA)
-	if (_color_type & PNG_COLOR_MASK_COLOR){
-		png_set_bgr(png_ptr);
-	}
-
-	// <vho> - handle cancel
-	if (info.nEscape)
-#if PNG_LIBPNG_VER > 10399
-		longjmp(png_jmpbuf(png_ptr), 1);
-#else
-		longjmp(png_ptr->jmpbuf, 1);
-#endif
-
-	// row_bytes is the width x number of channels x (bit-depth / 8)
-#if PNG_LIBPNG_VER > 10399
-	row_pointers = new uint8_t[png_get_rowbytes(png_ptr,info_ptr) + 8];
-#else
-	row_pointers = new uint8_t[info_ptr->rowbytes + 8];
-#endif
-
-
-	// turn on interlace handling
-	int32_t number_passes = png_set_interlace_handling(png_ptr);
-
-	if (number_passes>1){
-		SetCodecOption( (ENCODE_INTERLACE) | GetCodecOption(CXIMAGE_FORMAT_PNG));
-	} else {
-		SetCodecOption(~(ENCODE_INTERLACE) & GetCodecOption(CXIMAGE_FORMAT_PNG));
-	}
-
-	int chan_offset = _bit_depth >> 3;
-#if PNG_LIBPNG_VER > 10399
-	int pixel_offset = (_bit_depth * png_get_channels(png_ptr,info_ptr)) >> 3;
-#else
-	int pixel_offset = info_ptr->pixel_depth >> 3;
-#endif
-
-	for (int32_t pass=0; pass < number_passes; pass++) {
-		iter.Upset();
-		int32_t y=0;
-		do	{
-
-			// <vho> - handle cancel
-			if (info.nEscape)
-#if PNG_LIBPNG_VER > 10399
-				longjmp(png_jmpbuf(png_ptr), 1);
-#else
-				longjmp(png_ptr->jmpbuf, 1);
-#endif
-
-#if CXIMAGE_SUPPORT_ALPHA	// <vho>
-			if (AlphaIsValid()) {
-
-				//compute the correct position of the line
-				int32_t ax,ay;
-				ay = head.biHeight-1-y;
-				uint8_t* prow= iter.GetRow(ay);
-
-				//recover data from previous scan
-				if (_interlace_type && pass>0 && pass!=7){
-					for(ax=0;ax<head.biWidth;ax++){
-						int32_t px = ax * pixel_offset;
-						if (channels == 2){
-							row_pointers[px] = prow[ax];
-							row_pointers[px+chan_offset]=AlphaGet(ax,ay);
-						} else {
-							int32_t qx = ax * 3;
-							row_pointers[px]              =prow[qx];
-							row_pointers[px+chan_offset]  =prow[qx+1];
-							row_pointers[px+chan_offset*2]=prow[qx+2];
-							row_pointers[px+chan_offset*3]=AlphaGet(ax,ay);
-						}
-					}
-				}
-
-				//read next row
-				png_read_row(png_ptr, row_pointers, NULL);
-
-				//RGBA -> RGB + A
-				for(ax=0;ax<head.biWidth;ax++){
-					int32_t px = ax * pixel_offset;
-					if (channels == 2){
-						prow[ax] = row_pointers[px];
-						AlphaSet(ax,ay,row_pointers[px+chan_offset]);
-					} else {
-						int32_t qx = ax * 3;
-						prow[qx]  =row_pointers[px];
-						prow[qx+1]=row_pointers[px+chan_offset];
-						prow[qx+2]=row_pointers[px+chan_offset*2];
-						AlphaSet(ax,ay,row_pointers[px+chan_offset*3]);
-					}
-				}
-			} else
-#endif // CXIMAGE_SUPPORT_ALPHA		// vho
-			{
-				//recover data from previous scan
-				if (_interlace_type && pass>0){
-#if PNG_LIBPNG_VER > 10399
-					iter.GetRow(row_pointers, png_get_rowbytes(png_ptr,info_ptr));
-#else
-					iter.GetRow(row_pointers, info_ptr->rowbytes);
-#endif
-					//re-expand buffer for images with bit depth > 8
-					if (_bit_depth > 8){
-						for(int32_t ax=(head.biWidth*channels-1);ax>=0;ax--)
-							row_pointers[ax*chan_offset] = row_pointers[ax];
-					}
-				}
-
-				//read next row
-				png_read_row(png_ptr, row_pointers, NULL);
-
-				//shrink 16 bit depth images down to 8 bits
-				if (_bit_depth > 8){
-					for(int32_t ax=0;ax<(head.biWidth*channels);ax++)
-						row_pointers[ax] = row_pointers[ax*chan_offset];
-				}
-
-				//copy the pixels
-#if PNG_LIBPNG_VER > 10399
-				iter.SetRow(row_pointers, png_get_rowbytes(png_ptr,info_ptr));
-#else
-				iter.SetRow(row_pointers, info_ptr->rowbytes);
-#endif
-				//<DP> expand 2 bpp images only in the last pass
-				if (_bit_depth==2 && pass==(number_passes-1))
-					expand2to4bpp(iter.GetRow());
-
-				//go on
-				iter.PrevRow();
-			}
-
-			y++;
-		} while(y<head.biHeight);
-	}
-
-	delete [] row_pointers;
-	row_pointers = NULL;
-
-	/* read the rest of the file, getting any additional chunks in info_ptr - REQUIRED */
-	png_read_end(png_ptr, info_ptr);
-
-	/* clean up after the read, and free any memory allocated - REQUIRED */
-	png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
-
-  } cx_catch {
-	if (strcmp(message,"")) strncpy(info.szLastError,message,255);
-	if (info.nEscape == -1 && info.dwType == CXIMAGE_FORMAT_PNG) return true;
-	return false;
-  }
-	/* that's it */
-	return true;
-}
-////////////////////////////////////////////////////////////////////////////////
-#endif //CXIMAGE_SUPPORT_DECODE
-////////////////////////////////////////////////////////////////////////////////
-#if CXIMAGE_SUPPORT_ENCODE
-////////////////////////////////////////////////////////////////////////////////
-bool CxImagePNG::Encode(CxFile *hFile)
-{
-	if (EncodeSafeCheck(hFile)) return false;
-
-	CImageIterator iter(this);
-	uint8_t trans[256];	//for transparency (don't move)
-	png_struct *png_ptr;
-	png_info *info_ptr;
-
-  cx_try
-  {
-   /* Create and initialize the png_struct with the desired error handler
-    * functions.  If you want to use the default stderr and longjump method,
-    * you can supply NULL for the last three parameters.  We also check that
-    * the library version is compatible with the one used at compile time,
-    * in case we are using dynamically linked libraries.  REQUIRED.
-    */
-	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,(void *)NULL,NULL,NULL);
-	if (png_ptr == NULL) cx_throw("Failed to create PNG structure");
-
-	/* Allocate/initialize the image information data.  REQUIRED */
-	info_ptr = png_create_info_struct(png_ptr);
-	if (info_ptr == NULL){
-		png_destroy_write_struct(&png_ptr,  (png_infopp)NULL);
-		cx_throw("Failed to initialize PNG info structure");
-	}
-
-   /* Set error handling.  REQUIRED if you aren't supplying your own
-    * error hadnling functions in the png_create_write_struct() call.
-    */
-	if (setjmp(png_ptr->jmpbuf)){
-		/* If we get here, we had a problem reading the file */
-		if (info_ptr->palette) free(info_ptr->palette);
-		png_destroy_write_struct(&png_ptr,  (png_infopp)&info_ptr);
-		cx_throw("Error saving PNG file");
-	}
-
-	/* set up the output control */
-	//png_init_io(png_ptr, hFile);
-
-	// use custom I/O functions
-    png_set_write_fn(png_ptr,hFile,/*(png_rw_ptr)*/user_write_data,/*(png_flush_ptr)*/user_flush_data);
-
-	/* set the file information here */
-	info_ptr->width = GetWidth();
-	info_ptr->height = GetHeight();
-	info_ptr->pixel_depth = (uint8_t)GetBpp();
-	info_ptr->channels = (GetBpp()>8) ? (uint8_t)3: (uint8_t)1;
-	info_ptr->bit_depth = (uint8_t)(GetBpp()/info_ptr->channels);
-	info_ptr->compression_type = info_ptr->filter_type = 0;
-	info_ptr->valid = 0;
-
-	// set interlace type
-	DWORD codec_opt = GetCodecOption(CXIMAGE_FORMAT_PNG);
-	if (codec_opt & CxImagePNG::ENCODE_INTERLACE)
-		info_ptr->interlace_type = PNG_INTERLACE_ADAM7;
-	else
-		info_ptr->interlace_type = PNG_INTERLACE_NONE;
-
-	/* set compression level */
-	int32_t compress_level;
-	switch (codec_opt & CxImagePNG::ENCODE_COMPRESSION_MASK)
-	{
-	case ENCODE_NO_COMPRESSION:
-		compress_level = Z_NO_COMPRESSION;
-		break;
-	case ENCODE_BEST_SPEED:
-		compress_level = Z_BEST_SPEED;
-		break;
-	case ENCODE_BEST_COMPRESSION:
-		compress_level = Z_BEST_COMPRESSION;
-		break;
-	default:
-		compress_level = Z_DEFAULT_COMPRESSION;
-		break;
-	}
-	png_set_compression_level(png_ptr, compress_level);
-
-	bool bGrayScale = IsGrayScale();
-
-	if (GetNumColors()){
-		if (bGrayScale){
-			info_ptr->color_type = PNG_COLOR_TYPE_GRAY;
-		} else {
-			info_ptr->color_type = PNG_COLOR_TYPE_PALETTE;
-		}
-	} else {
-		info_ptr->color_type = PNG_COLOR_TYPE_RGB;
-	}
-#if CXIMAGE_SUPPORT_ALPHA
-	if (AlphaIsValid()){
-		info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
-		info_ptr->channels++;
-		info_ptr->bit_depth = 8;
-		info_ptr->pixel_depth += 8;
-	}
-#endif
-
-	/* set background */
-	png_color_16 image_background={ 0, 255, 255, 255, 0 };
-	RGBQUAD tc = GetTransColor();
-	if (info.nBkgndIndex>=0) {
-		image_background.blue  = tc.rgbBlue;
-		image_background.green = tc.rgbGreen;
-		image_background.red   = tc.rgbRed;
-	}
-	png_set_bKGD(png_ptr, info_ptr, &image_background);
-
-	/* set metrics */
-	png_set_pHYs(png_ptr, info_ptr, head.biXPelsPerMeter, head.biYPelsPerMeter, PNG_RESOLUTION_METER);
-
-	png_set_IHDR(png_ptr, info_ptr, info_ptr->width, info_ptr->height, info_ptr->bit_depth,
-				info_ptr->color_type, info_ptr->interlace_type,
-				PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
-	//<DP> simple transparency
-	if (info.nBkgndIndex >= 0){
-		info_ptr->num_trans = 1;
-		info_ptr->valid |= PNG_INFO_tRNS;
-		info_ptr->trans_alpha = trans;
-		info_ptr->trans_color.index = (uint8_t)info.nBkgndIndex;
-		info_ptr->trans_color.red   = tc.rgbRed;
-		info_ptr->trans_color.green = tc.rgbGreen;
-		info_ptr->trans_color.blue  = tc.rgbBlue;
-		info_ptr->trans_color.gray  = info_ptr->trans_color.index;
-
-		// the transparency indexes start from 0 for non grayscale palette
-		if (!bGrayScale && head.biClrUsed && info.nBkgndIndex)
-			SwapIndex(0,(uint8_t)info.nBkgndIndex);
-	}
-
-	/* set the palette if there is one */
-	if (GetPalette()){
-		if (!bGrayScale){
-			info_ptr->valid |= PNG_INFO_PLTE;
-		}
-
-		int32_t nc = GetClrImportant();
-		if (nc==0) nc = GetNumColors();
-
-		if (info.bAlphaPaletteEnabled){
-			for(uint16_t ip=0; ip<nc;ip++)
-				trans[ip]=GetPaletteColor((uint8_t)ip).rgbReserved;
-			info_ptr->num_trans = (uint16_t)nc;
-			info_ptr->valid |= PNG_INFO_tRNS;
-			info_ptr->trans_alpha = trans;
-		}
-
-		// copy the palette colors
-		info_ptr->palette = new png_color[nc];
-		info_ptr->num_palette = (png_uint_16) nc;
-		for (int32_t i=0; i<nc; i++)
-			GetPaletteColor(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
-	}
-
-#if CXIMAGE_SUPPORT_ALPHA	// <vho>
-	//Merge the transparent color with the alpha channel
-	if (AlphaIsValid() && head.biBitCount==24 && info.nBkgndIndex>=0){
-		for(int32_t y=0; y < head.biHeight; y++){
-			for(int32_t x=0; x < head.biWidth ; x++){
-				RGBQUAD c=GetPixelColor(x,y,false);
-				if (*(int32_t*)&c==*(int32_t*)&tc)
-					AlphaSet(x,y,0);
-	}	}	}
-#endif // CXIMAGE_SUPPORT_ALPHA	// <vho>
-
-	int32_t row_size = max(info.dwEffWidth, info_ptr->width*info_ptr->channels*(info_ptr->bit_depth/8));
-	info_ptr->rowbytes = row_size;
-	uint8_t *row_pointers = new uint8_t[row_size];
-
-	/* write the file information */
-	png_write_info(png_ptr, info_ptr);
-
-	//interlace handling
-	int32_t num_pass = png_set_interlace_handling(png_ptr);
-	for (int32_t pass = 0; pass < num_pass; pass++){
-		//write image
-		iter.Upset();
-		int32_t ay=head.biHeight-1;
-		RGBQUAD c;
-		do	{
-#if CXIMAGE_SUPPORT_ALPHA	// <vho>
-			if (AlphaIsValid()){
-				for (int32_t ax=head.biWidth-1; ax>=0;ax--){
-					c = BlindGetPixelColor(ax,ay);
-					int32_t px = ax * info_ptr->channels;
-					if (!bGrayScale){
-						row_pointers[px++]=c.rgbRed;
-						row_pointers[px++]=c.rgbGreen;
-					}
-					row_pointers[px++]=c.rgbBlue;
-					row_pointers[px] = AlphaGet(ax,ay);
-				}
-				png_write_row(png_ptr, row_pointers);
-				ay--;
-			}
-			else
-#endif //CXIMAGE_SUPPORT_ALPHA	// <vho>
-			{
-				iter.GetRow(row_pointers, row_size);
-				if (info_ptr->color_type == PNG_COLOR_TYPE_RGB) //HACK BY OP
-					RGBtoBGR(row_pointers, row_size);
-				png_write_row(png_ptr, row_pointers);
-			}
-		} while(iter.PrevRow());
-	}
-
-	delete [] row_pointers;
-	row_pointers = NULL;
-
-	//if necessary, restore the original palette
-	if (!bGrayScale && head.biClrUsed && info.nBkgndIndex>0)
-		SwapIndex((uint8_t)info.nBkgndIndex,0);
-
-	/* It is REQUIRED to call this to finish writing the rest of the file */
-	png_write_end(png_ptr, info_ptr);
-
-	/* if you malloced the palette, free it here */
-	if (info_ptr->palette){
-		delete [] (info_ptr->palette);
-		info_ptr->palette = NULL;
-	}
-
-	/* clean up after the write, and free any memory allocated */
-	png_destroy_write_struct(&png_ptr, (png_infopp)&info_ptr);
-
-  } cx_catch {
-	if (strcmp(message,"")) strncpy(info.szLastError,message,255);
-	return FALSE;
-  }
-	/* that's it */
-	return TRUE;
-}
-////////////////////////////////////////////////////////////////////////////////
-#endif // CXIMAGE_SUPPORT_ENCODE
-////////////////////////////////////////////////////////////////////////////////
-#endif // CXIMAGE_SUPPORT_PNG
-- 
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