diff options
Diffstat (limited to 'contrib/visupng/PngFile.c')
| -rw-r--r-- | contrib/visupng/PngFile.c | 114 |
1 files changed, 57 insertions, 57 deletions
diff --git a/contrib/visupng/PngFile.c b/contrib/visupng/PngFile.c index db0219e35..e741319e2 100644 --- a/contrib/visupng/PngFile.c +++ b/contrib/visupng/PngFile.c @@ -152,29 +152,29 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, Try { - + // initialize the png structure - + #ifdef PNG_STDIO_SUPPORTED png_init_io(png_ptr, pfFile); #else png_set_read_fn(png_ptr, (png_voidp)pfFile, png_read_data); #endif - + png_set_sig_bytes(png_ptr, 8); - + // read all PNG info up to image data - + png_read_info(png_ptr, info_ptr); - + // get width, height, bit-depth and color-type - + png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth, &iColorType, NULL, NULL, NULL); - + // expand images of all color-type and bit-depth to 3x8 bit RGB images // let the library process things like alpha, transparency, background - + if (iBitDepth == 16) png_set_strip_16(png_ptr); if (iColorType == PNG_COLOR_TYPE_PALETTE) @@ -186,7 +186,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, if (iColorType == PNG_COLOR_TYPE_GRAY || iColorType == PNG_COLOR_TYPE_GRAY_ALPHA) png_set_gray_to_rgb(png_ptr); - + // set the background color to draw transparent and alpha images over. if (png_get_bKGD(png_ptr, info_ptr, &pBackground)) { @@ -199,30 +199,30 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, { pBkgColor = NULL; } - + // if required set gamma conversion if (png_get_gAMA(png_ptr, info_ptr, &dGamma)) png_set_gamma(png_ptr, (double) 2.2, dGamma); - + // after the transformations have been registered update info_ptr data - + png_read_update_info(png_ptr, info_ptr); - + // get again width, height and the new bit-depth and color-type - + png_get_IHDR(png_ptr, info_ptr, piWidth, piHeight, &iBitDepth, &iColorType, NULL, NULL, NULL); - - + + // row_bytes is the width x number of channels - + ulRowBytes = png_get_rowbytes(png_ptr, info_ptr); ulChannels = png_get_channels(png_ptr, info_ptr); - + *piChannels = ulChannels; - + // now we can allocate memory to store the image - + if (pbImageData) { free (pbImageData); @@ -234,33 +234,33 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, png_error(png_ptr, "Visual PNG: out of memory"); } *ppbImageData = pbImageData; - + // and allocate memory for an array of row-pointers - + if ((ppbRowPointers = (png_bytepp) malloc((*piHeight) * sizeof(png_bytep))) == NULL) { png_error(png_ptr, "Visual PNG: out of memory"); } - + // set the individual row-pointers to point at the correct offsets - + for (i = 0; i < (*piHeight); i++) ppbRowPointers[i] = pbImageData + i * ulRowBytes; - + // now we can go ahead and just read the whole image - + png_read_image(png_ptr, ppbRowPointers); - + // read the additional chunks in the PNG file (not really needed) - + png_read_end(png_ptr, NULL); - + // and we're done - + free (ppbRowPointers); ppbRowPointers = NULL; - + // yepp, done } @@ -269,7 +269,7 @@ BOOL PngLoadImage (PTSTR pstrFileName, png_byte **ppbImageData, png_destroy_read_struct(&png_ptr, &info_ptr, NULL); *ppbImageData = pbImageData = NULL; - + if(ppbRowPointers) free (ppbRowPointers); @@ -323,58 +323,58 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData, Try { // initialize the png structure - + #ifdef PNG_STDIO_SUPPORTED png_init_io(png_ptr, pfFile); #else png_set_write_fn(png_ptr, (png_voidp)pfFile, png_write_data, png_flush); #endif - + // we're going to write a very simple 3x8 bit RGB image - + png_set_IHDR(png_ptr, info_ptr, iWidth, iHeight, ciBitDepth, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); - + // write the file header information - + png_write_info(png_ptr, info_ptr); - + // swap the BGR pixels in the DiData structure to RGB - + png_set_bgr(png_ptr); - + // row_bytes is the width x number of channels - + ulRowBytes = iWidth * ciChannels; - + // we can allocate memory for an array of row-pointers - + if ((ppbRowPointers = (png_bytepp) malloc(iHeight * sizeof(png_bytep))) == NULL) Throw "Visualpng: Out of memory"; - + // set the individual row-pointers to point at the correct offsets - + for (i = 0; i < iHeight; i++) ppbRowPointers[i] = pDiData + i * (((ulRowBytes + 3) >> 2) << 2); - + // write out the entire image data in one call - + png_write_image (png_ptr, ppbRowPointers); - + // write the additional chunks to the PNG file (not really needed) - + png_write_end(png_ptr, info_ptr); - + // and we're done - + free (ppbRowPointers); ppbRowPointers = NULL; - + // clean up after the write, and free any memory allocated - + png_destroy_write_struct(&png_ptr, (png_infopp) NULL); - + // yepp, done } @@ -389,9 +389,9 @@ BOOL PngSaveImage (PTSTR pstrFileName, png_byte *pDiData, return FALSE; } - + fclose (pfFile); - + return TRUE; } |