Hi all,
was this issue fixed in 0.7.4?
I used „LoadFromPngData“ but no alpha channel was used.
--
Grüße/Regards,
[heubach-media] | Christian Sakowski
christian.sakow...@heubach-media.de
iChat/AIM: SakowskiF
Tel: +49/(0)40/52 10 59-23
> Am 13.08.2015 um 11:59 schrieb ram yd <ydramku...@gmail.com>:
>
> Hi All,
>
> I myself fixed this issue in PODOFO.
>
> Issue : Transparency mask is stripped off and not exported as smask.
>
> Solution : I have converted 8 bit images to RGBA image and convert the
> transparency stream as a /smask stream in pdf.
>
> Tested with 8 bit pallete transparency image and RGBA transparency images
>
> I dont know how to merge this changes to PODOFO codebase.
>
>
> void PdfImage::LoadFromPng(const char* pszFilename)
> {
> if( !pszFilename )
> {
> PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
> }
>
> FILE* hFile = fopen(pszFilename, "rb");
> if( !hFile )
> {
> PODOFO_RAISE_ERROR_INFO( ePdfError_FileNotFound, pszFilename );
> }
>
> png_byte header[8];
> fread(header, 1, 8, hFile);
> if( png_sig_cmp(header, 0, 8) )
> {
> fclose( hFile );
> PODOFO_RAISE_ERROR_INFO( ePdfError_UnsupportedImageFormat, "The file
> could not be recognized as a PNG file." );
> }
>
> png_structp pPng = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL,
> NULL, NULL);
> if( !pPng )
> {
> fclose( hFile );
> PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
> }
>
> png_infop pInfo = png_create_info_struct(pPng);
> if( !pInfo )
> {
> png_destroy_read_struct(&pPng, (png_infopp)NULL, (png_infopp)NULL);
> fclose( hFile );
> PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
> }
>
> if( setjmp(png_jmpbuf(pPng)) )
> {
> png_destroy_read_struct(&pPng, &pInfo, (png_infopp)NULL);
> fclose( hFile );
> PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
> }
>
> png_init_io(pPng, hFile);
> png_set_sig_bytes(pPng, 8);
> png_read_info(pPng, pInfo);
>
> // Begin
> png_uint_32 width;
> png_uint_32 height;
> int depth;
> int color_type;
> int interlace;
>
> png_get_IHDR (pPng, pInfo,
> &width, &height, &depth,
> &color_type, &interlace, NULL, NULL);
>
> /* convert palette/gray image to rgb */
> if (color_type == PNG_COLOR_TYPE_PALETTE)
> png_set_palette_to_rgb(pPng);
>
> if( color_type == PNG_COLOR_TYPE_GRAY_ALPHA )
> png_set_gray_to_rgb(pPng);
>
> #if 0
> /* expand gray bit depth if needed */
> if (color_type == PNG_COLOR_TYPE_GRAY) {
> #if PNG_LIBPNG_VER >= 10209
> png_set_expand_gray_1_2_4_to_8 (pPng);
> #else
> png_set_gray_1_2_4_to_8 (pPng);
> #endif
> }
> #endif
> /* transform transparency to alpha */
> if (png_get_valid (pPng, pInfo, PNG_INFO_tRNS))
> png_set_tRNS_to_alpha (pPng);
>
> if (depth == 16)
> png_set_strip_16(pPng);
>
> if (depth < 8)
> png_set_packing(pPng);
> #if 0
> /* convert grayscale to RGB */
> if (color_type == PNG_COLOR_TYPE_GRAY ||
> color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
> {
> png_set_gray_to_rgb (pPng);
> }
> #endif
> if (interlace != PNG_INTERLACE_NONE)
> png_set_interlace_handling(pPng);
>
> //png_set_filler (pPng, 0xff, PNG_FILLER_AFTER);
>
> /* recheck header after setting EXPAND options */
> png_read_update_info(pPng, pInfo);
> png_get_IHDR (pPng, pInfo,
> &width, &height, &depth,
> &color_type, &interlace, NULL, NULL);
> // End //
>
> // Read the file
> if( setjmp(png_jmpbuf(pPng)) )
> {
> png_destroy_read_struct(&pPng, &pInfo, (png_infopp)NULL);
> fclose( hFile );
> PODOFO_RAISE_ERROR( ePdfError_InvalidHandle );
> }
>
>
> long lLen = static_cast<long>(png_get_rowbytes(pPng, pInfo) * height);
> char* pBuffer = static_cast<char*>(malloc(sizeof(char) * lLen));
> png_bytepp pRows = NULL;
> if (pBuffer)
> {
> pRows = static_cast<png_bytepp>(malloc(sizeof(png_bytep)*height));
> if (pRows)
> {
> for (unsigned int y = 0; y < height; y++)
> {
> pRows[y] = reinterpret_cast<png_bytep>(pBuffer + (y *
> png_get_rowbytes(pPng, pInfo)));
> }
>
> png_read_image(pPng, pRows);
>
> png_bytep *row_ptr, row;
> row_ptr = pRows;
> char* smask_data = static_cast<char*>(malloc(sizeof(char) *
> (width*height)));
> if (smask_data)
> {
> int row_len = 3 * width * sizeof(png_byte);
>
> for (int j = 0; j < height; j++) {
> row = pRows[j];
> for (int i = 0; i < width; i++) {
> smask_data[width * j + i] = row[4 * i + 3];
> }
> }
> char* image_data_ptr = pBuffer;
> for (int i = 0; i < width*height; i++)
> {
> memmove(image_data_ptr + (3 * i), image_data_ptr + (4 *
> i), 3);
> }
>
> fclose(hFile);
>
> m_rRect.SetWidth(width);
> m_rRect.SetHeight(height);
>
> this->SetImageColorSpace(ePdfColorSpace_DeviceRGB);
>
>
> // Set the image data and flate compress it
> PdfMemoryInputStream stream(pBuffer, row_len * height);
> this->SetImageData(width, height, depth, &stream);
>
> PdfMemoryInputStream smaskstream(smask_data, width * height);
> PdfImage smakeImage(this->pCurDocParent);
> smakeImage.SetImageColorSpace(ePdfColorSpace_DeviceGray);
> smakeImage.SetImageData(width, height, depth, &smaskstream);
> this->SetImageSoftmask(&smakeImage);
> }
> free(smask_data);
> }
> }
>
> free(pBuffer);
> free(pRows);
>
> png_destroy_read_struct(&pPng, &pInfo, (png_infopp)NULL);
>
> }
>
> On Fri, Aug 7, 2015 at 4:23 PM, ram yd <ydramku...@gmail.com> wrote:
> Hi
> In our project, we are using PODOFO library to create PDF file. When I was
> trying to add the PNG image with transparency, it exported the png image
> without transparency in PDF file.
>
> Further analysis shows that PODOFO lib is converting transparency to alpha
> channel. But similar code is not exist in LibHaru. Libharu exporting the
> transparency mask as xref.
>
> Please let me know, how to export transparency png image by using PODOFO.
>
>
>
> --
> Regards,
> Ramkumar Y.D
>
>
>
> --
> Regards,
> Ramkumar Y.D
> ------------------------------------------------------------------------------
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> Podofo-users@lists.sourceforge.net
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