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253 lines
8.0 KiB
253 lines
8.0 KiB
/*==LICENSE==* |
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CyanWorlds.com Engine - MMOG client, server and tools |
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Copyright (C) 2011 Cyan Worlds, Inc. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. |
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You can contact Cyan Worlds, Inc. by email legal@cyan.com |
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or by snail mail at: |
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Cyan Worlds, Inc. |
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14617 N Newport Hwy |
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Mead, WA 99021 |
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*==LICENSE==*/ |
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#include "hsTypes.h" |
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#include "hsStream.h" |
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#include "hsExceptions.h" |
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#include "hsUtils.h" |
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#include "plPNG.h" |
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#include "../plGImage/plMipmap.h" |
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#include <png.h> |
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#define PNGSIGSIZE 8 |
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// Custom functions to read and write data from or to an hsStream |
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// used by libPNG's respective functions |
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void pngReadDelegate(png_structp png_ptr, png_bytep png_data, png_size_t length) |
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{ |
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hsStream *inStream = (hsStream *)png_get_io_ptr(png_ptr); |
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inStream->Read(length, (UInt8 *)png_data); |
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} |
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void pngWriteDelegate(png_structp png_ptr, png_bytep png_data, png_size_t length) |
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{ |
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hsStream *outStream = (hsStream *)png_get_io_ptr(png_ptr); |
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outStream->Write(length, (UInt8 *)png_data); |
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} |
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//// Singleton Instance /////////////////////////////////////////////////////// |
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plPNG &plPNG::Instance( void ) |
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{ |
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static plPNG theInstance; |
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return theInstance; |
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} |
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//// IRead //////////////////////////////////////////////////////////////////// |
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// Given an open hsStream, reads the PNG data off of the |
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// stream and decodes it into a new plMipmap. The mipmap's buffer ends up |
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// being a packed RGBA buffer. |
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// Returns a pointer to the new mipmap if successful, NULL otherwise. |
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plMipmap* plPNG::IRead( hsStream *inStream ) |
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{ |
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plMipmap *newMipmap = NULL; |
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png_structp png_ptr; |
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png_infop info_ptr; |
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png_infop end_info; |
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try |
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{ |
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// Check PNG Signature |
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png_byte sig[PNGSIGSIZE]; |
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inStream->Read8Bytes((char *) sig); |
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if (!png_sig_cmp(sig, 0, PNGSIGSIZE)) |
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{ |
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// Allocate required structs |
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png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
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if (!png_ptr) |
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throw( false ); |
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info_ptr = png_create_info_struct(png_ptr); |
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if (!info_ptr) |
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{ |
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png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL); |
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throw( false ); |
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} |
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end_info = png_create_info_struct(png_ptr); |
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if (!end_info) |
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{ |
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL); |
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throw( false ); |
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} |
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// Assign delegate function for reading from hsStream |
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png_set_read_fn(png_ptr, (png_voidp)inStream, pngReadDelegate); |
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// Get PNG Header information |
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png_set_sig_bytes(png_ptr, PNGSIGSIZE); |
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png_read_info(png_ptr, info_ptr); |
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png_uint_32 imgWidth = png_get_image_width(png_ptr, info_ptr); |
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png_uint_32 imgHeight = png_get_image_height(png_ptr, info_ptr); |
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png_uint_32 bitdepth = png_get_bit_depth(png_ptr, info_ptr); |
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png_uint_32 channels = png_get_channels(png_ptr, info_ptr); |
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png_uint_32 color_type = png_get_color_type(png_ptr, info_ptr); |
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// Convert images to RGB color space |
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switch (color_type) { |
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case PNG_COLOR_TYPE_PALETTE: |
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png_set_palette_to_rgb(png_ptr); |
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channels = 3; |
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break; |
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case PNG_COLOR_TYPE_GRAY: |
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if (bitdepth < 8) |
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png_set_expand_gray_1_2_4_to_8(png_ptr); |
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bitdepth = 8; |
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break; |
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} |
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// Convert transparency (if needed) to a full alpha channel |
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if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) |
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{ |
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png_set_tRNS_to_alpha(png_ptr); |
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channels+=1; |
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} |
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// Invert color byte-order as used by plMipmap for DirectX |
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png_set_bgr(png_ptr); |
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/// Construct a new mipmap to hold everything |
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newMipmap = TRACKED_NEW plMipmap(imgWidth, imgHeight, plMipmap::kARGB32Config, 1, plMipmap::kUncompressed); |
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char *destp = (char *)newMipmap->GetImage(); |
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png_bytep *row_ptrs = TRACKED_NEW png_bytep[imgHeight]; |
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const unsigned int stride = imgWidth * bitdepth * channels / 8; |
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// Assign row pointers to the appropriate locations in the newly-created Mipmap |
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for (size_t i = 0; i < imgHeight; i++) |
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{ |
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row_ptrs[i] = (png_bytep)destp + (i * stride); |
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} |
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png_read_image(png_ptr, row_ptrs); |
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// Clean up allocated structs |
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info); |
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delete [] row_ptrs; |
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} |
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} |
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catch( ... ) |
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{ |
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if (newMipmap != NULL) |
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{ |
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delete newMipmap; |
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newMipmap = NULL; |
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} |
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} |
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return newMipmap; |
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} |
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plMipmap* plPNG::ReadFromFile( const char *fileName ) |
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{ |
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wchar* wFilename = hsStringToWString(fileName); |
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plMipmap* retVal = ReadFromFile(wFilename); |
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delete [] wFilename; |
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return retVal; |
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} |
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plMipmap* plPNG::ReadFromFile( const wchar *fileName ) |
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{ |
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hsUNIXStream in; |
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if (!in.Open(fileName, L"rb")) |
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return false; |
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plMipmap* ret = IRead(&in); |
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in.Close(); |
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return ret; |
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} |
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hsBool plPNG::IWrite( plMipmap *source, hsStream *outStream ) |
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{ |
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hsBool result = true; |
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try |
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{ |
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// Allocate required structs |
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png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
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if (!png_ptr) |
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throw( false ); |
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png_infop info_ptr = png_create_info_struct(png_ptr); |
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if (!info_ptr) |
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{ |
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png_destroy_write_struct(&png_ptr, (png_infopp)NULL); |
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throw( false ); |
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} |
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// Assign delegate function for writing to hsStream |
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png_set_write_fn(png_ptr, (png_voidp)outStream, pngWriteDelegate, NULL); |
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UInt8 psize = source->GetPixelSize(); |
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png_set_IHDR(png_ptr, info_ptr, source->GetWidth(), source->GetHeight(), 8, PNG_COLOR_TYPE_RGB_ALPHA, |
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); |
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// Invert color byte-order as used by plMipmap for DirectX |
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png_set_bgr(png_ptr); |
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// Write out the image metadata |
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png_write_info(png_ptr, info_ptr); |
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char *srcp = (char *)source->GetImage(); |
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png_bytep *row_ptrs = TRACKED_NEW png_bytep[source->GetHeight()]; |
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const unsigned int stride = source->GetWidth() * source->GetPixelSize() / 8; |
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// Assign row pointers to the appropriate locations in the newly-created Mipmap |
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for (size_t i = 0; i < source->GetHeight(); i++) |
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{ |
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row_ptrs[i] = (png_bytep)srcp + (i * stride); |
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} |
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png_write_image(png_ptr, row_ptrs); |
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png_write_end(png_ptr, info_ptr); |
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// Clean up allocated structs |
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png_destroy_write_struct(&png_ptr, &info_ptr); |
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delete [] row_ptrs; |
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} |
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catch( ... ) |
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{ |
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result = false; |
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} |
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return result; |
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} |
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hsBool plPNG::WriteToFile( const char *fileName, plMipmap *sourceData ) |
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{ |
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wchar* wFilename = hsStringToWString(fileName); |
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hsBool retVal = WriteToFile(wFilename, sourceData); |
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delete [] wFilename; |
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return retVal; |
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} |
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hsBool plPNG::WriteToFile( const wchar *fileName, plMipmap *sourceData ) |
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{ |
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hsUNIXStream out; |
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if (!out.Open(fileName, L"wb")) |
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return false; |
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hsBool ret = IWrite(sourceData, &out); |
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out.Close(); |
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return ret; |
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}
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