C++ png_set_filter函数代码示例

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本文整理汇总了C++中png_set_filter函数的典型用法代码示例。如果您正苦于以下问题：C++ png_set_filter函数的具体用法？C++ png_set_filter怎么用？C++ png_set_filter使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了png_set_filter函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: s_PngWriteInit

//
// initialize PNG writing
//
static void s_PngWriteInit(png_structp& png_ptr,
                           png_infop&   info_ptr,
                           size_t width, size_t height, size_t depth,
                           CImageIO::ECompress compress)
{
    png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL,
                                      s_PngWriteErrorHandler,
                                      s_PngWarningHandler);
    if ( !png_ptr ) {
        NCBI_THROW(CImageException, eWriteError,
                   "CImageIOPng::WriteImage(): png_create_read_struct() failed");
    }

    info_ptr = png_create_info_struct(png_ptr);
    if ( !info_ptr ) {
        NCBI_THROW(CImageException, eWriteError,
                   "CImageIOPng::WriteImage(): png_create_info_struct() failed");
    }

    png_byte color_type = PNG_COLOR_TYPE_RGB;
    if (depth == 4) {
        color_type = PNG_COLOR_TYPE_RGBA;
    }
    png_set_IHDR(png_ptr, info_ptr,
                 width, height, 8, color_type,
                 PNG_INTERLACE_NONE,
                 PNG_COMPRESSION_TYPE_BASE,
                 PNG_FILTER_TYPE_BASE);

    // set our compression quality
    switch (compress) {
    case CImageIO::eCompress_None:
        png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
        png_set_compression_level(png_ptr, Z_NO_COMPRESSION);
        break;
    case CImageIO::eCompress_Low:
        png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
        png_set_compression_level(png_ptr, Z_BEST_SPEED);
        break;
    case CImageIO::eCompress_Medium:
        png_set_compression_level(png_ptr, Z_DEFAULT_COMPRESSION);
        break;
    case CImageIO::eCompress_High:
        png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
        break;
    default:
        LOG_POST_X(26, Error << "unknown compression type: " << (int)compress);
        break;
    }

}

开发者ID:svn2github，项目名称:ncbi_tk，代码行数:54，代码来源:image_io_png.cpp

示例2: rgb2png

static size_t rgb2png(ss_t **png, const ss_t *rgb, const struct RGB_Info *ri)
{
	RETURN_IF(!valid_rgbi(ri) ||!rgb, 0);
	size_t out_size = 0;
	png_structp s = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
	png_infop pi = png_create_info_struct(s);
	if (png)
		ss_set_size(*png, 0);
	png_set_write_fn(s, (png_voidp)png, aux_png_write, NULL);
	int ctype = (ri->chn > 1 ? PNG_COLOR_MASK_COLOR : 0) |
		    (ri->chn == 2 || ri->chn == 4 ? PNG_COLOR_MASK_ALPHA : 0);
	png_set_IHDR(s, pi, (png_uint_32)ri->width, (png_uint_32)ri->height,
		     ri->bpc, ctype, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
		     PNG_FILTER_TYPE_BASE);
	png_set_filter(s, PNG_FILTER_TYPE_BASE, PNG_ALL_FILTERS);
	png_set_compression_level(s, Z_BEST_COMPRESSION);
	png_write_info(s, pi);
	png_bytep *rows = (png_bytep *)alloca(sizeof(png_bytep) * pi->height);
	if (aux_png_set_rows(rows, pi, ss_get_buffer_r(rgb))) {
		png_write_image(s, rows);
		png_write_end(s, pi);
		out_size = ss_size(*png);
	}
	png_destroy_info_struct(s, &pi);
	png_destroy_write_struct(&s, &pi);
	return out_size;
}

开发者ID:lamproae，项目名称:libsrt，代码行数:27，代码来源:imgc.c

示例3: png_create_write_struct

std::unique_ptr<PNGImageEncoderState> PNGImageEncoderState::create(const IntSize& imageSize, Vector<unsigned char>* output)
{
    if (imageSize.width() <= 0 || imageSize.height() <= 0)
        return nullptr;

    png_struct* png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
    png_info* info = png_create_info_struct(png);
    if (!png || !info || setjmp(png_jmpbuf(png))) {
        png_destroy_write_struct(png ? &png : 0, info ? &info : 0);
        return nullptr;
    }

    // Optimize compression for speed.
    // The parameters are the same as what libpng uses by default for RGB and RGBA images, except:
    // The zlib compression level is set to 3 instead of 6, to avoid the lazy Ziv-Lempel match searching.
    png_set_compression_level(png, 3);

    // The zlib memory level is set to 8.  This actually matches the default, we are just future-proofing.
    png_set_compression_mem_level(png, 8);

    // The zlib strategy is set to Z_FILTERED, which does not match the default.
    // Avoid the zlib strategies Z_HUFFMAN_ONLY or Z_RLE.
    // Although they are the fastest for poorly-compressible images (e.g. photographs),
    // they are very slow for highly-compressible images (e.g. text, drawings or business graphics)
    png_set_compression_strategy(png, Z_FILTERED);

    // The delta filter is PNG_FILTER_SUB instead of PNG_ALL_FILTERS, to reduce the filter computations.
    png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);

    png_set_write_fn(png, output, writeOutput, 0);
    png_set_IHDR(png, info, imageSize.width(), imageSize.height(), 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0, 0);
    png_write_info(png, info);

    return wrapUnique(new PNGImageEncoderState(png, info));
}

开发者ID:endlessm，项目名称:chromium-browser，代码行数:35，代码来源:PNGImageEncoder.cpp

示例4: write_png

static void write_png(const png_bytep rgba, png_uint_32 width, png_uint_32 height, SkWStream& out) {
    png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    SkASSERT(png != nullptr);
    png_infop info_ptr = png_create_info_struct(png);
    SkASSERT(info_ptr != nullptr);
    if (setjmp(png_jmpbuf(png))) {
        SkFAIL("png encode error");
    }
    png_set_IHDR(png, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
                 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
    png_set_compression_level(png, 1);
    png_bytepp rows = (png_bytepp) sk_malloc_throw(height * sizeof(png_byte*));
    png_bytep pixels = (png_bytep) sk_malloc_throw(width * height * 3);
    for (png_size_t y = 0; y < height; ++y) {
        const png_bytep src = rgba + y * width * 4;
        rows[y] = pixels + y * width * 3;
        // convert from RGBA to RGB
        for (png_size_t x = 0; x < width; ++x) {
            rows[y][x * 3] = src[x * 4];
            rows[y][x * 3 + 1] = src[x * 4 + 1];
            rows[y][x * 3 + 2] = src[x * 4 + 2];
        }
    }
    png_set_filter(png, 0, PNG_NO_FILTERS);
    png_set_rows(png, info_ptr, &rows[0]);
    png_set_write_fn(png, &out, write_png_callback, NULL);
    png_write_png(png, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
    png_destroy_write_struct(&png, NULL);
    sk_free(rows);
}

开发者ID:nagyist，项目名称:google-skia，代码行数:30，代码来源:Request.cpp

示例5: WritePNG

errort	WritePNG( FILE * fp , unsigned char * data, unsigned int sizeX, unsigned int sizeY, int img_depth, int img_alpha)
{
  png_structp png_ptr = png_create_write_struct
    (PNG_LIBPNG_VER_STRING, (png_voidp)NULL,NULL,NULL);
  if (!png_ptr)
    return BadFormat;
  
  png_infop info_ptr = png_create_info_struct(png_ptr);
  if (!info_ptr) {
    png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
    return BadFormat;
  }
  if (setjmp(png_ptr->jmpbuf)) {
    png_destroy_write_struct(&png_ptr, &info_ptr);
    return BadFormat;
  }

  png_init_io(png_ptr, fp);

  png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
  png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);

  /* set other zlib parameters */
  png_set_compression_mem_level(png_ptr, 8);
  png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
  png_set_compression_window_bits(png_ptr, 15);
  png_set_compression_method(png_ptr, 8);
  
  png_set_IHDR(png_ptr, 
	       info_ptr, 
	       sizeX,
	       sizeY,
	       img_depth, 
	       img_alpha?PNG_COLOR_TYPE_RGB_ALPHA:PNG_COLOR_TYPE_RGB, 
	       PNG_INTERLACE_NONE,
	       PNG_COMPRESSION_TYPE_DEFAULT, 
	       PNG_FILTER_TYPE_DEFAULT);
  
  png_write_info(png_ptr, info_ptr);
# if __BYTE_ORDER != __BIG_ENDIAN  
  if (img_depth==16) {
    png_set_swap(png_ptr);
  }
#endif
  int stride = (img_depth/8)*(img_alpha?4:3);
  png_byte **row_pointers = new png_byte*[sizeY];
  for (unsigned int i=0;i<sizeY;i++) {
    row_pointers[i]= (png_byte *)&data[stride*i*sizeX];
  }
  png_write_image (png_ptr,row_pointers);
  png_write_end(png_ptr, info_ptr);
  png_write_flush(png_ptr);
  png_destroy_write_struct(&png_ptr, &info_ptr);

  //free (data);
  delete [] row_pointers;
  return Ok;
}

开发者ID:bsmr-games，项目名称:Privateer-Gemini-Gold，代码行数:58，代码来源:shrinker.cpp

示例6: write_png

void write_png(FileSystem::FileSourceFS &fs, const std::string &path, const Uint8 *bytes, int width, int height, int stride, int bytes_per_pixel) {
	png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
	if (!png_ptr) {
		fprintf(stderr, "Couldn't create png_write_struct\n");
		return;
	}

	png_infop info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr) {
		png_destroy_write_struct(&png_ptr, 0);
		fprintf(stderr, "Couldn't create png_info_struct\n");
		return;
	}

	//http://www.libpng.org/pub/png/libpng-1.2.5-manual.html#section-3.1
	if (setjmp(png_jmpbuf(png_ptr))) {
		png_destroy_write_struct(&png_ptr, &info_ptr);
		fprintf(stderr, "Couldn't set png jump buffer\n");
		return;
	}

	FILE *out = fs.OpenWriteStream(path);
	if (!out) {
		png_destroy_write_struct(&png_ptr, &info_ptr);
		fprintf(stderr, "Couldn't open '%s/%s' for writing\n", fs.GetRoot().c_str(), path.c_str());
		return;
	}

	int colour_type;
	switch (bytes_per_pixel) {
		case 1: colour_type = PNG_COLOR_TYPE_GRAY; break;
		case 2: colour_type = PNG_COLOR_TYPE_GRAY_ALPHA; break;
		case 3: colour_type = PNG_COLOR_TYPE_RGB; break;
		case 4: colour_type = PNG_COLOR_TYPE_RGB_ALPHA; break;
		default: assert(0); return;
	}

	png_init_io(png_ptr, out);
	png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
	png_set_IHDR(png_ptr, info_ptr, width, height, 8, colour_type,
		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
		PNG_FILTER_TYPE_DEFAULT);

	png_bytepp rows = new png_bytep[height];

	for (int i = 0; i < height; ++i) {
		const Uint8 *row = bytes + ((height-i-1) * stride);
		rows[i] = const_cast<Uint8*>(row);
	}
	png_set_rows(png_ptr, info_ptr, rows);
	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, 0);

	png_destroy_write_struct(&png_ptr, &info_ptr);

	delete[] rows;

	fclose(out);
}

开发者ID:GizmoR13，项目名称:pioneer，代码行数:58，代码来源:PngWriter.cpp

示例7: fopen

bool CPNGFile::Save(const char *szFilename)
{
	// regular file saving - first, there has to be a buffer
	if (!pImageData) return false;
	// open the file
	fp = fopen(szFilename, "wb"); if (!fp) return false;
	// clear any previously initialized png-structs (e.g. by reading)
	ClearPngStructs();
	// reinit them for writing
	fWriteMode=true;
	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	if (!png_ptr) { Clear(); return false; }
	info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr) { Clear(); return false; }
	// error handling
	if (setjmp(png_jmpbuf(png_ptr))) { Clear(); return false; }
	// io initialization
	png_init_io(png_ptr, fp);
	// compression stuff
	png_set_filter(png_ptr, 0, PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_PAETH);
	png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
	png_set_compression_mem_level(png_ptr, 8);
	png_set_compression_strategy(png_ptr, Z_DEFAULT_STRATEGY);
	png_set_compression_window_bits(png_ptr, 15);
	png_set_compression_method(png_ptr, 8);
	// set header
	png_set_IHDR(png_ptr, info_ptr, iWdt, iHgt, iBPC, iClrType, iIntrlcType, iCmprType, iFltrType);
	// double-check our calculated row size
	int iRealRowSize=png_get_rowbytes(png_ptr, info_ptr);
	if (iRealRowSize != iRowSize)
	{
		// this won't go well, so better abort
		Clear(); return false;
	}
	// write png header
	png_write_info(png_ptr, info_ptr);
	// image data is given as bgr...
	png_set_bgr(png_ptr);
	// create row array
	unsigned char **ppRowBuf = new unsigned char *[iHgt];
	unsigned char **ppRows=ppRowBuf; unsigned char *pRow=pImageData;
	for (unsigned int i=0; i<iHgt; ++i,pRow+=iRowSize) *ppRows++=pRow;
	// write image
	png_write_image(png_ptr, ppRowBuf);
	// free row buffer
	delete [] ppRowBuf;
	// write end struct
	png_write_end(png_ptr, info_ptr);
	// finally, close the file
	fclose(fp); fp = NULL;
	// clear png structs
	ClearPngStructs();
	// success!
	return true;
}

开发者ID:sarah-russell12，项目名称:openclonk，代码行数:55，代码来源:StdPNG.cpp

示例8: png_write

void png_write( const char *myfile, unsigned char *data, unsigned int width, unsigned int height, bool alpha, char bpp )
{
    FILE *fp = VSFileSystem::vs_open( myfile, "wb" );
    png_structp png_ptr = png_create_write_struct
                              ( PNG_LIBPNG_VER_STRING, (png_voidp) NULL, NULL, NULL );
    if (!png_ptr)
        return;
    png_infop info_ptr = png_create_info_struct( png_ptr );
    if (!info_ptr) {
        png_destroy_write_struct( &png_ptr, (png_infopp) NULL );
        return;
    }
    if ( setjmp( png_ptr->jmpbuf ) ) {
        png_destroy_write_struct( &png_ptr, &info_ptr );
        VSFileSystem::vs_close( fp );
        return;
    }
    png_init_io( png_ptr, fp );
    png_set_filter( png_ptr, 0, PNG_FILTER_NONE );
    png_set_compression_level( png_ptr, Z_BEST_COMPRESSION );

    /* set other zlib parameters */
    png_set_compression_mem_level( png_ptr, 8 );
    png_set_compression_strategy( png_ptr, Z_DEFAULT_STRATEGY );
    png_set_compression_window_bits( png_ptr, 15 );
    png_set_compression_method( png_ptr, 8 );

    png_set_IHDR( png_ptr,
                  info_ptr,
                  width,
                  height,
                  bpp,
                  alpha ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB,
                  PNG_INTERLACE_NONE,
                  PNG_COMPRESSION_TYPE_DEFAULT,
                  PNG_FILTER_TYPE_DEFAULT );

    png_write_info( png_ptr, info_ptr );
# if __BYTE_ORDER != __BIG_ENDIAN
    if (bpp == 16)
        png_set_swap( png_ptr );
#endif
    int stride = (bpp/8)*(alpha ? 4 : 3);
    png_byte **row_pointers = new png_byte*[height];
    for (unsigned int i = 0; i < height; i++)
        row_pointers[i] = (png_byte*) &data[stride*i*width];
    png_write_image( png_ptr, row_pointers );
    png_write_end( png_ptr, info_ptr );
    png_write_flush( png_ptr );
    png_destroy_write_struct( &png_ptr, &info_ptr );

    VSFileSystem::vs_close( fp );
    free( data );
    delete[] row_pointers;
}

开发者ID:vegastrike，项目名称:Vega-Strike-Engine-Source，代码行数:55，代码来源:bmp_to_png.cpp

示例9: png_create_write_struct

void PNGImageWriter::beginOfImage(int cols, int rows) {
    _png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

    _info_ptr = png_create_info_struct(_png_ptr);
    if (!_info_ptr) {
        png_destroy_write_struct(&_png_ptr, NULL);
        exit(1);
    }

    png_set_IHDR(_png_ptr,
		 _info_ptr,
		 cols,
		 rows,
		 16,
		 PNG_COLOR_TYPE_GRAY,
		 PNG_INTERLACE_NONE,
		 NULL/*PNG_COMPRESSION_TYPE_DEFAULT*/,
		 PNG_FILTER_TYPE_DEFAULT);
    //png_set_filter(_png_ptr, 0, PNG_FILTER_NONE);
    //png_set_packing(_png_ptr);
    png_set_compression_level(_png_ptr, 0); // No compression
    png_set_filter(_png_ptr, 0 /* method */, PNG_NO_FILTERS);

    png_color_8 sig_bit;
    sig_bit.gray  = 16;
    sig_bit.red   = 0;
    sig_bit.green = 0;
    sig_bit.blue  = 0;
    sig_bit.alpha = 0;
    png_set_sBIT(_png_ptr, _info_ptr, &sig_bit);
    //png_set_shift(_png_ptr, &sig_bit);

    //png_set_gamma(_png_ptr, 1., 1.);
    png_set_strip_16(_png_ptr);

    //if (lsb)
    //png_set_swap(_png_ptr);

    // flush output after every row
    if (_lineBuffered)
	png_set_flush(_png_ptr, 1);

    //png_set_filler(_png_ptr, 0, PNG_FILLER_BEFORE);

    // Represent black as 1 and white as 0 instead of the PNG default.
    //png_set_invert_mono(_png_ptr);

    png_init_io(_png_ptr, _output);

    /* write the file information */
    png_write_info(_png_ptr, _info_ptr);
}

开发者ID:arnaudetitia，项目名称:DGtalTools，代码行数:52，代码来源:PNGImageWriter.cpp

示例10: gdImagePng

void gdImagePng(gdImagePtr im, FILE *out)
{
    int i;
    png_colorp palette;
    png_structp png_write_ptr =
        png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                (png_voidp)NULL,
                                /* we would need to point to error handlers
                                   here to do it properly */
                                (png_error_ptr)NULL, (png_error_ptr)NULL);
    png_infop info_ptr = png_create_info_struct(png_write_ptr);

    if (setjmp(gdPngJmpbufStruct.jmpbuf)) {
        png_destroy_write_struct(&png_write_ptr, &info_ptr);
        return;
    }

    palette = (png_colorp)png_malloc (png_write_ptr,
                                      im->colorsTotal*sizeof(png_color));
    if (palette == NULL) {
        png_destroy_write_struct(&png_write_ptr, &info_ptr);
        return;
    }


    png_init_io(png_write_ptr, out);
    png_set_write_status_fn(png_write_ptr, NULL);
    png_set_IHDR(png_write_ptr,info_ptr,
                 im->sx,im->sy,im->colorsTotal > 16 ? 8:4,
                 PNG_COLOR_TYPE_PALETTE,
                 im->interlace ? PNG_INTERLACE_ADAM7: PNG_INTERLACE_NONE ,
                 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
    for(i=0; i<im->colorsTotal; i++) {
        palette[i].red = im->red[i];
        palette[i].green = im->green[i];
        palette[i].blue = im->blue[i];
    }
    png_set_PLTE(png_write_ptr, info_ptr, palette, im->colorsTotal);

    /* choose between speed (1) and space (9) optimization */
    /* we want to be fast ... */
    png_set_compression_level(png_write_ptr,1);
    png_set_filter(png_write_ptr,PNG_FILTER_TYPE_BASE,PNG_NO_FILTERS);
    /* store file info */
    png_write_info(png_write_ptr, info_ptr);
    png_set_packing(png_write_ptr);
    png_write_image(png_write_ptr, im->pixels);
    png_write_end(png_write_ptr, info_ptr);
    png_free(png_write_ptr, palette);
    png_destroy_write_struct(&png_write_ptr, &info_ptr);
}

开发者ID:blair，项目名称:orca，代码行数:51，代码来源:gdpng.c

示例11: error

bool
PNGOutput::open (const std::string &name, const ImageSpec &userspec,
                 OpenMode mode)
{
    if (mode != Create) {
        error ("%s does not support subimages or MIP levels", format_name());
        return false;
    }

    close ();  // Close any already-opened file
    m_spec = userspec;  // Stash the spec

    m_file = Filesystem::fopen (name, "wb");
    if (! m_file) {
        error ("Could not open file \"%s\"", name.c_str());
        return false;
    }

    std::string s = PNG_pvt::create_write_struct (m_png, m_info,
                                                  m_color_type, m_spec);
    if (s.length ()) {
        close ();
        error ("%s", s.c_str ());
        return false;
    }

	png_init_io (m_png, m_file);
	
	int compression_level = 6; /* medium speed vs size tradeoff */

	// RTT MOD: CVI use incoming compression values
	const ImageIOParameter *compParameter = m_spec.find_attribute ("CompressionQuality",TypeDesc::INT);
	if (compParameter)
	{
		compression_level = *(const int *)compParameter->data();
		compression_level = std::min( std::max( compression_level, 0 ), 9 ); // compression 0-9
	}
	png_set_compression_level (m_png, compression_level);

	const ImageIOParameter *filterParameter = m_spec.find_attribute ("png:Filters",TypeDesc::INT);
	if (filterParameter)
	{
		int filters = *(const int *)filterParameter->data();
		filters &= PNG_ALL_FILTERS;
		png_set_filter(m_png, 0, filters);
	}
	
    PNG_pvt::write_info (m_png, m_info, m_color_type, m_spec, m_pngtext);

    return true;
}

开发者ID:rttag，项目名称:oiio，代码行数:51，代码来源:pngoutput.cpp

示例12: GetFrontBufferPixels

void CSnapShot::WriteImageToFile(CThread * pThread)
{
	m_threadData.bWriting = true;

	D3DDISPLAYMODE displayMode;
	g_pCore->GetGraphics()->GetDevice()->GetDisplayMode(0, &displayMode);

	UINT uiScreenWidth = displayMode.Width;
	UINT uiScreenHeight = displayMode.Height;
	BYTE* mem = new BYTE[SCREEN_SHOT_FORMAT_BYTES_PER_PIXEL * uiScreenWidth * uiScreenWidth];

	GetFrontBufferPixels(uiScreenWidth, uiScreenHeight, mem);

	BYTE** ScreenData = nullptr;
	ScreenData = new BYTE* [uiScreenHeight];
	for (unsigned short y = 0; y < uiScreenHeight; y++) {
		ScreenData[y] = new BYTE[uiScreenWidth * SCREEN_SHOT_FORMAT_BYTES_PER_PIXEL];
	}

	UINT uiLinePitch = uiScreenWidth * SCREEN_SHOT_FORMAT_BYTES_PER_PIXEL;
	unsigned long ulLineWidth = uiScreenWidth * SCREEN_SHOT_FORMAT_BYTES_PER_PIXEL;
	for (unsigned int i = 0; i < uiScreenHeight; i++) {
		memcpy(ScreenData[i], (BYTE*) mem + i* uiLinePitch, ulLineWidth);
		for(unsigned int j = 3; j < ulLineWidth; j += SCREEN_SHOT_FORMAT_BYTES_PER_PIXEL) {
			ScreenData[i][j] = 0xFF;
		}
	}

	CString strPath = GetScreenShotPath();
	FILE *file = fopen(strPath, "wb");
	png_struct* png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	png_info* info_ptr = png_create_info_struct(png_ptr);
	png_init_io(png_ptr, file);
	png_set_filter(png_ptr, 0, PNG_FILTER_NONE);
	png_set_compression_level(png_ptr, 9);
	png_set_IHDR(png_ptr, info_ptr, uiScreenWidth, uiScreenHeight, 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
	png_set_rows(png_ptr, info_ptr, ScreenData);
	png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_BGR | PNG_TRANSFORM_STRIP_ALPHA, NULL);
	png_write_end(png_ptr, info_ptr);
	png_destroy_write_struct(&png_ptr, &info_ptr);
	fclose(file);

	for (unsigned short y = 0; y < uiScreenHeight; y++) {
		delete []ScreenData[y];
	}

	delete []ScreenData;
	delete []mem;
	m_threadData.bWriting = false;
}

开发者ID:Disinterpreter，项目名称:IV-Network，代码行数:50，代码来源:CSnapShot.cpp

示例13: save_as_png

void save_as_png(T1 & file,
                T2 const& image,
                png_options const& opts)

{
    png_voidp error_ptr=0;
    png_structp png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                                error_ptr,0, 0);

    if (!png_ptr) return;

    // switch on optimization only if supported
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200) && defined(PNG_MMX_CODE_SUPPORTED)
    png_uint_32 mask, flags;
    flags = png_get_asm_flags(png_ptr);
    mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
    png_set_asm_flags(png_ptr, flags | mask);
#endif
    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_NONE);
    png_infop info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr)
    {
        png_destroy_write_struct(&png_ptr,static_cast<png_infopp>(0));
        return;
    }
    jmp_buf* jmp_context = static_cast<jmp_buf*>(png_get_error_ptr(png_ptr));
    if (jmp_context)
    {
        png_destroy_write_struct(&png_ptr, &info_ptr);
        return;
    }
    png_set_write_fn (png_ptr, &file, &write_data<T1>, &flush_data<T1>);

    png_set_compression_level(png_ptr, opts.compression);
    png_set_compression_strategy(png_ptr, opts.strategy);
    png_set_compression_buffer_size(png_ptr, 32768);

    png_set_IHDR(png_ptr, info_ptr,image.width(),image.height(),8,
                 (opts.trans_mode == 0) ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA,PNG_INTERLACE_NONE,
                 PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
    const std::unique_ptr<png_bytep[]> row_pointers(new png_bytep[image.height()]);
    for (unsigned int i = 0; i < image.height(); i++)
    {
        row_pointers[i] = const_cast<png_bytep>(reinterpret_cast<const unsigned char *>(image.get_row(i)));
    }
    png_set_rows(png_ptr, info_ptr, row_pointers.get());
    png_write_png(png_ptr, info_ptr, (opts.trans_mode == 0) ? PNG_TRANSFORM_STRIP_FILLER_AFTER : PNG_TRANSFORM_IDENTITY, nullptr);
    png_destroy_write_struct(&png_ptr, &info_ptr);
}

开发者ID:DavidLiuGitHub，项目名称:mapnik，代码行数:49，代码来源:png_io.hpp

示例14: open_png

void
open_png(void)
{
 png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING,NULL,NULL,NULL);
 info_ptr=png_create_info_struct(png_ptr);
 png_init_io(png_ptr,of);
 png_set_filter(png_ptr,0,PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP
  |PNG_FILTER_AVG|PNG_FILTER_PAETH);
 png_set_compression_level(png_ptr,Z_BEST_COMPRESSION);
 png_set_IHDR(png_ptr,info_ptr,ox,oy,8,PNG_COLOR_TYPE_GRAY,PNG_INTERLACE_NONE,
  PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
 png_set_gAMA(png_ptr,info_ptr,1.0);
 png_set_pHYs(png_ptr,info_ptr,ppm,ppm,PNG_RESOLUTION_METER);
 png_write_info(png_ptr,info_ptr);
}

开发者ID:engine12，项目名称:links，代码行数:15，代码来源:pbm2png.c

示例15: writePNG

void writePNG (png_bytepp imageBuffer, png_uint_32 width, png_uint_32 height, int iteration) {
  const char *fname = "out.png";
  
  FILE *fp = fopen(fname, "wb");
  if (!fp) return;
  png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
  png_infop  info_ptr = png_create_info_struct(png_ptr);
  png_init_io(png_ptr, fp);
  png_set_filter(png_ptr, PNG_FILTER_TYPE_DEFAULT, PNG_FILTER_NONE);
  png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
  png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
  png_set_rows(png_ptr, info_ptr, imageBuffer);
  png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
  png_destroy_write_struct(&png_ptr, &info_ptr);
  fclose(fp);
}

开发者ID:wito，项目名称:raytrace，代码行数:16，代码来源:raytrace.c

示例16: encodePixels

static bool encodePixels(IntSize imageSize, const unsigned char* inputPixels, bool premultiplied, Vector<unsigned char>* output)
{
    if (imageSize.width() <= 0 || imageSize.height() <= 0)
        return false;

    Vector<unsigned char> row;

    png_struct* png = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
    png_info* info = png_create_info_struct(png);
    if (!png || !info || setjmp(png_jmpbuf(png))) {
        png_destroy_write_struct(png ? &png : 0, info ? &info : 0);
        return false;
    }

    // Optimize compression for speed.
    // The parameters are the same as what libpng uses by default for RGB and RGBA images, except:
    // - the zlib compression level is 3 instead of 6, to avoid the lazy Ziv-Lempel match searching;
    // - the delta filter is 1 ("sub") instead of 5 ("all"), to reduce the filter computations.
    // The zlib memory level (8) and strategy (Z_FILTERED) will be set inside libpng.
    //
    // Avoid the zlib strategies Z_HUFFMAN_ONLY or Z_RLE.
    // Although they are the fastest for poorly-compressible images (e.g. photographs),
    // they are very slow for highly-compressible images (e.g. text, drawings or business graphics).
    png_set_compression_level(png, 3);
    png_set_filter(png, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);

    png_set_write_fn(png, output, writeOutput, 0);
    png_set_IHDR(png, info, imageSize.width(), imageSize.height(),
                 8, PNG_COLOR_TYPE_RGB_ALPHA, 0, 0, 0);
    png_write_info(png, info);

    unsigned char* pixels = const_cast<unsigned char*>(inputPixels);
    row.resize(imageSize.width() * sizeof(SkPMColor));
    const size_t pixelRowStride = imageSize.width() * 4;
    for (int y = 0; y < imageSize.height(); ++y) {
        if (premultiplied) {
            preMultipliedBGRAtoRGBA(pixels, imageSize.width(), row.data());
            png_write_row(png, row.data());
        } else
            png_write_row(png, pixels);
        pixels += pixelRowStride;
    }

    png_write_end(png, info);
    png_destroy_write_struct(&png, &info);
    return true;
}

开发者ID:smishenk，项目名称:chromium-crosswalk，代码行数:47，代码来源:PNGImageEncoder.cpp

示例17: memcpy

// Callback for threaded save
// Static function
DWORD CScreenShot::ThreadProc ( LPVOID lpdwThreadParam )
{
    unsigned long ulScreenHeight = ms_ScreenSize.bottom - ms_ScreenSize.top;
    unsigned long ulScreenWidth = ms_ScreenSize.right - ms_ScreenSize.left;

    // Create the screen data buffer
    BYTE** ppScreenData = NULL;
    ppScreenData = new BYTE* [ ulScreenHeight ];
    for ( unsigned short y = 0; y < ulScreenHeight; y++ ) {
        ppScreenData[y] = new BYTE [ ulScreenWidth * 4 ];
    }

    // Copy the surface data into a row-based buffer for libpng
    #define BYTESPERPIXEL 4
    unsigned long ulLineWidth = ulScreenWidth * 4;
    for ( unsigned int i = 0; i < ulScreenHeight; i++ ) {
        memcpy ( ppScreenData[i], (BYTE*) ms_pBits + i* ms_ulPitch, ulLineWidth );
        for ( unsigned int j = 3; j < ulLineWidth; j += BYTESPERPIXEL ) {
            ppScreenData[i][j] = 0xFF;
        }
    }

    FILE *file = fopen (ms_strFileName, "wb");
        png_struct* png_ptr = png_create_write_struct ( PNG_LIBPNG_VER_STRING, NULL, NULL, NULL );
        png_info* info_ptr = png_create_info_struct ( png_ptr );
        png_init_io ( png_ptr, file );
        png_set_filter ( png_ptr, 0, PNG_FILTER_NONE );
        png_set_compression_level ( png_ptr, 1 );
        png_set_IHDR ( png_ptr, info_ptr, ulScreenWidth, ulScreenHeight, 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT );
        png_set_rows ( png_ptr, info_ptr, ppScreenData );
        png_write_png ( png_ptr, info_ptr, PNG_TRANSFORM_BGR | PNG_TRANSFORM_STRIP_ALPHA, NULL );
        png_write_end ( png_ptr, info_ptr );
        png_destroy_write_struct ( &png_ptr, &info_ptr );
    fclose(file);

    // Clean up the screen data buffer
    if ( ppScreenData ) {
        for ( unsigned short y = 0; y < ulScreenHeight; y++ ) {
            delete [] ppScreenData[y];
        }
        delete [] ppScreenData;
    }

    ms_bIsSaving = false;
    return 0;
}

开发者ID:EagleShen，项目名称:MTA，代码行数:48，代码来源:CScreenShot.cpp

示例18: save_as_png

void save_as_png(T1 & file , T2 const& image, int compression = Z_DEFAULT_COMPRESSION, int strategy = Z_DEFAULT_STRATEGY)
{
    png_voidp error_ptr=0;
    png_structp png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING,
                                                error_ptr,0, 0);

    if (!png_ptr) return;

    // switch on optimization only if supported
#if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200) && defined(PNG_MMX_CODE_SUPPORTED)
    png_uint_32 mask, flags;
    flags = png_get_asm_flags(png_ptr);
    mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
    png_set_asm_flags(png_ptr, flags | mask);
#endif
    png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_NONE);
    png_infop info_ptr = png_create_info_struct(png_ptr);
    if (!info_ptr)
    {
        png_destroy_write_struct(&png_ptr,(png_infopp)0);
        return;
    }
    jmp_buf* jmp_context = (jmp_buf*) png_get_error_ptr(png_ptr);
    if (jmp_context)
    {
        png_destroy_write_struct(&png_ptr, &info_ptr);
        return;
    }
    png_set_write_fn (png_ptr, &file, &write_data<T1>, &flush_data<T1>);

    png_set_compression_level(png_ptr, compression);
    png_set_compression_strategy(png_ptr, strategy);
    png_set_compression_buffer_size(png_ptr, 32768);

    png_set_IHDR(png_ptr, info_ptr,image.width(),image.height(),8,
                 PNG_COLOR_TYPE_RGB_ALPHA,PNG_INTERLACE_NONE,
                 PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_DEFAULT);
    png_write_info(png_ptr, info_ptr);
    for (unsigned i=0;i<image.height();i++)
    {
        png_write_row(png_ptr,(png_bytep)image.getRow(i));
    }

    png_write_end(png_ptr, info_ptr);
    png_destroy_write_struct(&png_ptr, &info_ptr);
}

开发者ID:doubleotoo，项目名称:mapnik，代码行数:46，代码来源:png_io.hpp

示例19: png_write_data

int png_write_data(const char *filename, uint8 *data, uint32 width, uint32 height)
{
  FILE *fp;
  uint32_t i;

  fp = fopen(filename, "wb");
  if (!fp) return -1;
   
  png_structp png_ptr = png_create_write_struct
    (PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
     NULL, NULL);
  if (!png_ptr)
    return false;
  
  png_infop info_ptr = png_create_info_struct(png_ptr);
  if (!info_ptr) 
  {
    png_destroy_write_struct(&png_ptr,(png_infopp)NULL);
    return false;
  }

  png_init_io(png_ptr, fp);
  
  png_set_filter(png_ptr, 0, PNG_FILTER_VALUE_NONE);
  png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
  
  png_set_IHDR(png_ptr, info_ptr, width, height, 8, 
               PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, 
               PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
  
  png_bytepp row_pointers = (png_bytepp)malloc(sizeof(png_bytep)*height);
  
  for(i = 0; i < height; i++)
      row_pointers[i] = &data[3*i*width];

  png_set_rows(png_ptr, info_ptr, row_pointers);

  png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);

  png_destroy_write_struct(&png_ptr, &info_ptr);
  
  free(row_pointers);
  fclose(fp);   
  return 0;
}

开发者ID:foreverlikeyou9999，项目名称:kos-ports，代码行数:45，代码来源:writepng.c

示例20: opng_encode_image

/*
 * Encodes an image to a PNG file stream.
 */
int opng_encode_image(struct opng_codec_context *context, int filtered, FILE *stream, const char *fname, int level)
{
    const char * volatile err_msg;  /* volatile is required by cexcept */

    context->libpng_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, opng_write_error, opng_write_warning);
    context->info_ptr = png_create_info_struct(context->libpng_ptr);
    if (!context->libpng_ptr || !context->info_ptr)
    {
        opng_error(0, "Out of memory");
        png_destroy_write_struct(&context->libpng_ptr, &context->info_ptr);
        exit(1);
    }

    struct opng_encoding_stats * stats = context->stats;
    opng_init_stats(stats);
    context->stream = stream;
    context->fname = fname;

    Try
    {

        png_set_filter(context->libpng_ptr, PNG_FILTER_TYPE_BASE, filtered ? PNG_ALL_FILTERS : PNG_FILTER_NONE);
        if (level != 6) {
            png_set_compression_level(context->libpng_ptr, level);
        }
        png_set_compression_mem_level(context->libpng_ptr, 8);
        png_set_compression_window_bits(context->libpng_ptr, 15);
        png_set_compression_strategy(context->libpng_ptr, 0);
        png_set_keep_unknown_chunks(context->libpng_ptr, PNG_HANDLE_CHUNK_ALWAYS, 0, 0);
        opng_store_image(context->image, context->libpng_ptr, context->info_ptr);

        /* Write the PNG stream. */
        png_set_write_fn(context->libpng_ptr, context, opng_write_data, 0);
        png_write_png(context->libpng_ptr, context->info_ptr, 0, 0);
    }
    Catch (err_msg)
    {
        stats->idat_size = OPTK_INT64_MAX;
        opng_error(fname, err_msg);
        return -1;
    }
    png_data_freer(context->libpng_ptr, context->info_ptr, PNG_USER_WILL_FREE_DATA, PNG_FREE_ALL);
    png_destroy_write_struct(&context->libpng_ptr, &context->info_ptr);
    return 0;
}

开发者ID:RamiroCruzo，项目名称:Efficient-Compression-Tool，代码行数:48，代码来源:codec.c

注：本文中的png_set_filter函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ png_set_filter函数代码示例

示例1: s_PngWriteInit

示例2: rgb2png

示例3: png_create_write_struct

示例4: write_png

示例5: WritePNG

示例6: write_png

示例7: fopen

示例8: png_write

示例9: png_create_write_struct

示例10: gdImagePng

示例11: error

示例12: GetFrontBufferPixels

示例13: save_as_png

示例14: open_png

示例15: writePNG

示例16: encodePixels

示例17: memcpy

示例18: save_as_png

示例19: png_write_data

示例20: opng_encode_image

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