diff options
Diffstat (limited to 'archive/hge/CxImage/ximapng.cpp')
| -rw-r--r-- | archive/hge/CxImage/ximapng.cpp | 644 |
1 files changed, 644 insertions, 0 deletions
diff --git a/archive/hge/CxImage/ximapng.cpp b/archive/hge/CxImage/ximapng.cpp new file mode 100644 index 0000000..db2f636 --- /dev/null +++ b/archive/hge/CxImage/ximapng.cpp @@ -0,0 +1,644 @@ +/*
+ * 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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