1 // Copyright (C) 2002-2012 Nikolaus Gebhardt
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2 // This file is part of the "Irrlicht Engine".
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3 // For conditions of distribution and use, see copyright notice in irrlicht.h
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5 #include "CImageWriterPNG.h"
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7 #include "CImageLoaderPNG.h"
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8 #include "CColorConverter.h"
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9 #include "IWriteFile.h"
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10 #include "irrString.h"
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11 #include "os.h" // for logging
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13 #include <png.h> // use system lib png
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20 IImageWriter* createImageWriterPNG()
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22 return new CImageWriterPNG;
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25 // PNG function for error handling
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26 static void png_cpexcept_error(png_structp png_ptr, png_const_charp msg)
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28 os::Printer::log("PNG fatal error", msg, ELL_ERROR);
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29 longjmp(png_jmpbuf(png_ptr), 1);
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32 // PNG function for warning handling
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33 static void png_cpexcept_warning(png_structp png_ptr, png_const_charp msg)
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35 os::Printer::log("PNG warning", msg, ELL_WARNING);
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38 // PNG function for file writing
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39 void PNGAPI user_write_data_fcn(png_structp png_ptr, png_bytep data, png_size_t length)
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43 io::IWriteFile* file=(io::IWriteFile*)png_get_io_ptr(png_ptr);
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44 check=(png_size_t) file->write((const void*)data, length);
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46 if (check != length)
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47 png_error(png_ptr, "Write Error");
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50 CImageWriterPNG::CImageWriterPNG()
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53 setDebugName("CImageWriterPNG");
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57 bool CImageWriterPNG::isAWriteableFileExtension(const io::path& filename) const
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59 return core::hasFileExtension ( filename, "png" );
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62 bool CImageWriterPNG::writeImage(io::IWriteFile* file, IImage* image,u32 param) const
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64 if (!file || !image)
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67 // Allocate the png write struct
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68 png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
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69 NULL, (png_error_ptr)png_cpexcept_error, (png_error_ptr)png_cpexcept_warning);
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72 os::Printer::log("PNGWriter: Internal PNG create write struct failure\n", file->getFileName(), ELL_ERROR);
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76 // Allocate the png info struct
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77 png_infop info_ptr = png_create_info_struct(png_ptr);
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80 os::Printer::log("PNGWriter: Internal PNG create info struct failure\n", file->getFileName(), ELL_ERROR);
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81 png_destroy_write_struct(&png_ptr, NULL);
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85 // for proper error handling
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86 if (setjmp(png_jmpbuf(png_ptr)))
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88 png_destroy_write_struct(&png_ptr, &info_ptr);
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92 png_set_write_fn(png_ptr, file, user_write_data_fcn, NULL);
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95 switch(image->getColorFormat())
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99 png_set_IHDR(png_ptr, info_ptr,
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100 image->getDimension().Width, image->getDimension().Height,
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101 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
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102 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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105 png_set_IHDR(png_ptr, info_ptr,
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106 image->getDimension().Width, image->getDimension().Height,
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107 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
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108 PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
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111 s32 lineWidth = image->getDimension().Width;
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112 switch(image->getColorFormat())
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122 // TODO: Error handling in case of unsupported color format
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126 u8* tmpImage = new u8[image->getDimension().Height*lineWidth];
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129 os::Printer::log("PNGWriter: Internal PNG create image failure\n", file->getFileName(), ELL_ERROR);
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130 png_destroy_write_struct(&png_ptr, &info_ptr);
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134 u8* data = (u8*)image->getData();
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135 switch(image->getColorFormat())
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138 CColorConverter::convert_R8G8B8toR8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
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141 CColorConverter::convert_A8R8G8B8toA8R8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
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144 CColorConverter::convert_R5G6B5toR8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
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147 CColorConverter::convert_A1R5G5B5toA8R8G8B8(data,image->getDimension().Height*image->getDimension().Width,tmpImage);
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149 // TODO: Error handling in case of unsupported color format
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151 os::Printer::log("CImageWriterPNG does not support image format", ColorFormatNames[image->getColorFormat()], ELL_WARNING);
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152 png_destroy_write_struct(&png_ptr, &info_ptr);
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153 delete [] tmpImage;
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157 // Create array of pointers to rows in image data
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159 //Used to point to image rows
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160 u8** RowPointers = new png_bytep[image->getDimension().Height];
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163 os::Printer::log("PNGWriter: Internal PNG create row pointers failure\n", file->getFileName(), ELL_ERROR);
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164 png_destroy_write_struct(&png_ptr, &info_ptr);
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165 delete [] tmpImage;
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170 // Fill array of pointers to rows in image data
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171 for (u32 i=0; i<image->getDimension().Height; ++i)
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173 RowPointers[i]=data;
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176 // for proper error handling
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177 if (setjmp(png_jmpbuf(png_ptr)))
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179 png_destroy_write_struct(&png_ptr, &info_ptr);
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180 delete [] RowPointers;
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181 delete [] tmpImage;
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185 png_set_rows(png_ptr, info_ptr, RowPointers);
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187 if (image->getColorFormat()==ECF_A8R8G8B8 || image->getColorFormat()==ECF_A1R5G5B5)
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188 png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_BGR, NULL);
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191 png_write_png(png_ptr, info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
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194 delete [] RowPointers;
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195 delete [] tmpImage;
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196 png_destroy_write_struct(&png_ptr, &info_ptr);
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200 } // namespace video
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