949 lines
23 KiB
C++
949 lines
23 KiB
C++
// image.cpp
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//
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// Copyright (C) 2001, Chris Laurel
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include <fstream>
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#ifndef TARGET_OS_MAC
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#define JPEG_SUPPORT
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#define PNG_SUPPORT
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#endif
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#ifdef TARGET_OS_MAC
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#include <unistd.h>
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#include "CGBuffer.h"
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#ifndef PNG_SUPPORT
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#include <Quicktime/ImageCompression.h>
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#include <QuickTime/QuickTimeComponents.h>
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#endif
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#endif
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#ifndef _WIN32
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#ifndef TARGET_OS_MAC
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#include <config.h>
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#endif /* ! TARGET_OS_MAC */
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#endif /* ! _WIN32 */
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#include "image.h"
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#ifdef JPEG_SUPPORT
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#include <cstring> /* for memcpy */
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#ifndef PNG_SUPPORT
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#include "setjmp.h"
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#endif // PNG_SUPPORT
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extern "C" {
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#ifdef _WIN32
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#include "jpeglib.h"
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#else
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#include <cstdio>
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#include <jpeglib.h>
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#endif
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}
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#endif // JPEG_SUPPORT
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#ifdef PNG_SUPPORT // PNG_SUPPORT
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#include "png.h"
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#include <celutil/debug.h>
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#include <celutil/util.h>
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#include <celutil/filetype.h>
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#include "gl.h"
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#include "glext.h"
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#include "celestia.h"
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#include <cassert>
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#include <iostream>
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#include <algorithm>
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#include <cmath>
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using namespace std;
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// Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng
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#ifndef png_jmpbuf
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#define png_jmpbuf(png_ptr) png_ptr->jmpbuf
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#endif // PNG_SUPPORT
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// Define various expansion transformations for old versions of libpng
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#if PNG_LIBPNG_VER < 10004
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#define png_set_palette_to_rgb(p) png_set_expand(p)
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#define png_set_gray_1_2_4_to_8(p) png_set_expand(p)
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#define png_set_tRNS_to_alpha(p) png_set_expand(p)
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#endif // PNG_LIBPNG_VER < 10004
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#endif // PNG_SUPPORT
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// All rows are padded to a size that's a multiple of 4 bytes
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static int pad(int n)
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{
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return (n + 3) & ~0x3;
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}
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static int formatComponents(int fmt)
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{
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switch (fmt)
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{
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case GL_RGBA:
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case GL_BGRA_EXT:
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return 4;
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case GL_RGB:
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case GL_BGR_EXT:
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return 3;
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case GL_LUMINANCE_ALPHA:
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case GL_DSDT_NV:
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return 2;
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case GL_ALPHA:
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case GL_LUMINANCE:
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return 1;
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// Compressed formats
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case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
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return 3;
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
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return 4;
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// Unknown format
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default:
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return 0;
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}
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}
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static int calcMipLevelSize(int fmt, int w, int h, int mip)
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{
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w = max(w >> mip, 1);
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h = max(h >> mip, 1);
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switch (fmt)
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{
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case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
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// 4x4 blocks, 8 bytes per block
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return ((w + 3) / 4) * ((h + 3) / 4) * 8;
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
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// 4x4 blocks, 16 bytes per block
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return ((w + 3) / 4) * ((h + 3) / 4) * 16;
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default:
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return h * pad(w * formatComponents(fmt));
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}
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}
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Image::Image(int fmt, int w, int h, int mip) :
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width(w),
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height(h),
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mipLevels(mip),
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format(fmt),
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pixels(NULL)
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{
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components = formatComponents(fmt);
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assert(components != 0);
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pitch = pad(w * components);
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size = 1;
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for (int i = 0; i < mipLevels; i++)
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size += calcMipLevelSize(fmt, w, h, i);
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pixels = new unsigned char[size];
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}
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Image::~Image()
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{
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if (pixels != NULL)
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delete[] pixels;
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}
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int Image::getWidth() const
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{
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return width;
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}
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int Image::getHeight() const
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{
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return height;
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}
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int Image::getPitch() const
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{
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return pitch;
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}
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int Image::getMipLevelCount() const
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{
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return mipLevels;
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}
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int Image::getSize() const
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{
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return size;
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}
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int Image::getFormat() const
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{
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return format;
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}
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int Image::getComponents() const
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{
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return components;
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}
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unsigned char* Image::getPixels()
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{
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return pixels;
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}
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unsigned char* Image::getPixelRow(int mip, int row)
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{
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/*int w = max(width >> mip, 1); Unused*/
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int h = max(height >> mip, 1);
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if (mip >= mipLevels || row >= h)
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return NULL;
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// Row addressing of compressed textures is not allowed
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if (isCompressed())
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return NULL;
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return getMipLevel(mip) + row * pitch;
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}
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unsigned char* Image::getPixelRow(int row)
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{
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return getPixelRow(0, row);
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}
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unsigned char* Image::getMipLevel(int mip)
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{
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if (mip >= mipLevels)
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return NULL;
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int offset = 0;
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for (int i = 0; i < mip; i++)
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offset += calcMipLevelSize(format, width, height, i);
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return pixels + offset;
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}
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int Image::getMipLevelSize(int mip) const
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{
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if (mip >= mipLevels)
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return 0;
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else
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return calcMipLevelSize(format, width, height, mip);
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}
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bool Image::isCompressed() const
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{
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switch (format)
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{
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case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
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return true;
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default:
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return false;
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}
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}
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bool Image::hasAlpha() const
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{
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switch (format)
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{
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case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
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case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
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case GL_RGBA:
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case GL_BGRA_EXT:
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case GL_LUMINANCE_ALPHA:
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case GL_ALPHA:
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return true;
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default:
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return false;
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}
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}
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// Convert an input height map to a normal map. Ideally, a single channel
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// input should be used. If not, the first color channel of the input image
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// is the one only one used when generating normals. This produces the
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// expected results for grayscale values in RGB images.
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Image* Image::computeNormalMap(float scale, bool wrap) const
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{
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// Can't do anything with compressed input; there are probably some other
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// formats that should be rejected as well . . .
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if (isCompressed())
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return NULL;
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Image* normalMap = new Image(GL_RGBA, width, height);
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if (normalMap == NULL)
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return NULL;
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unsigned char* nmPixels = normalMap->getPixels();
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int nmPitch = normalMap->getPitch();
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// Compute normals using differences between adjacent texels.
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for (int i = 0; i < height; i++)
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{
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for (int j = 0; j < width; j++)
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{
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int i0 = i;
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int j0 = j;
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int i1 = i - 1;
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int j1 = j - 1;
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if (i1 < 0)
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{
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if (wrap)
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{
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i1 = height - 1;
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}
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else
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{
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i0++;
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i1++;
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}
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}
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if (j1 < 0)
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{
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if (wrap)
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{
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j1 = width - 1;
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}
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else
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{
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j0++;
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j1++;
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}
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}
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int h00 = (int) pixels[i0 * pitch + j0 * components];
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int h10 = (int) pixels[i0 * pitch + j1 * components];
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int h01 = (int) pixels[i1 * pitch + j0 * components];
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float dx = (float) (h10 - h00) * (1.0f / 255.0f) * scale;
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float dy = (float) (h01 - h00) * (1.0f / 255.0f) * scale;
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float mag = (float) sqrt(dx * dx + dy * dy + 1.0f);
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float rmag = 1.0f / mag;
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int n = i * nmPitch + j * 4;
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nmPixels[n] = (unsigned char) (128 + 127 * dx * rmag);
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nmPixels[n + 1] = (unsigned char) (128 + 127 * dy * rmag);
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nmPixels[n + 2] = (unsigned char) (128 + 127 * rmag);
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nmPixels[n + 3] = 255;
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}
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}
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return normalMap;
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}
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Image* LoadImageFromFile(const string& filename)
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{
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ContentType type = DetermineFileType(filename);
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Image* img = NULL;
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clog << _("Loading image from file ") << filename << '\n';
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switch (type)
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{
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case Content_JPEG:
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img = LoadJPEGImage(filename);
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break;
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case Content_BMP:
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img = LoadBMPImage(filename);
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break;
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case Content_PNG:
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img = LoadPNGImage(filename);
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break;
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case Content_DDS:
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case Content_DXT5NormalMap:
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img = LoadDDSImage(filename);
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break;
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default:
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clog << filename << _(": unrecognized or unsupported image file type.\n");
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break;
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}
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return img;
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}
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#ifdef JPEG_SUPPORT
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struct my_error_mgr
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{
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struct jpeg_error_mgr pub; // "public" fields
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jmp_buf setjmp_buffer; // for return to caller
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};
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typedef struct my_error_mgr *my_error_ptr;
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METHODDEF(void) my_error_exit(j_common_ptr cinfo)
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{
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// cinfo->err really points to a my_error_mgr struct, so coerce pointer
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my_error_ptr myerr = (my_error_ptr) cinfo->err;
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// Always display the message.
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// We could postpone this until after returning, if we chose.
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(*cinfo->err->output_message) (cinfo);
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// Return control to the setjmp point
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longjmp(myerr->setjmp_buffer, 1);
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}
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#endif // JPEG_SUPPORT
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Image* LoadJPEGImage(const string& filename, int)
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{
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#ifdef JPEG_SUPPORT
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Image* img = NULL;
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// This struct contains the JPEG decompression parameters and pointers to
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// working space (which is allocated as needed by the JPEG library).
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struct jpeg_decompress_struct cinfo;
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// We use our private extension JPEG error handler.
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// Note that this struct must live as long as the main JPEG parameter
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// struct, to avoid dangling-pointer problems.
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struct my_error_mgr jerr;
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// More stuff
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JSAMPARRAY buffer; // Output row buffer
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int row_stride; // physical row width in output buffer
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long cont;
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// In this example we want to open the input file before doing anything else,
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// so that the setjmp() error recovery below can assume the file is open.
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// VERY IMPORTANT: use "b" option to fopen() if you are on a machine that
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// requires it in order to read binary files.
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FILE *in;
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in = fopen(filename.c_str(), "rb");
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if (in == NULL)
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return NULL;
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// Step 1: allocate and initialize JPEG decompression object
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// We set up the normal JPEG error routines, then override error_exit.
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cinfo.err = jpeg_std_error(&jerr.pub);
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jerr.pub.error_exit = my_error_exit;
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// Establish the setjmp return context for my_error_exit to use.
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if (setjmp(jerr.setjmp_buffer))
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{
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// If we get here, the JPEG code has signaled an error.
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// We need to clean up the JPEG object, close the input file, and return.
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jpeg_destroy_decompress(&cinfo);
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fclose(in);
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if (img != NULL)
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delete img;
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return NULL;
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}
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// Now we can initialize the JPEG decompression object.
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jpeg_create_decompress(&cinfo);
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// Step 2: specify data source (eg, a file)
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jpeg_stdio_src(&cinfo, in);
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// Step 3: read file parameters with jpeg_read_header()
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(void) jpeg_read_header(&cinfo, TRUE);
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// We can ignore the return value from jpeg_read_header since
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// (a) suspension is not possible with the stdio data source, and
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// (b) we passed TRUE to reject a tables-only JPEG file as an error.
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// Step 4: set parameters for decompression
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// In this example, we don't need to change any of the defaults set by
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// jpeg_read_header(), so we do nothing here.
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// Step 5: Start decompressor
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(void) jpeg_start_decompress(&cinfo);
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// We can ignore the return value since suspension is not possible
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// with the stdio data source.
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// We may need to do some setup of our own at this point before reading
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// the data. After jpeg_start_decompress() we have the correct scaled
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// output image dimensions available, as well as the output colormap
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// if we asked for color quantization.
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// In this example, we need to make an output work buffer of the right size.
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// JSAMPLEs per row in output buffer
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row_stride = cinfo.output_width * cinfo.output_components;
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// Make a one-row-high sample array that will go away when done with image
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buffer = (*cinfo.mem->alloc_sarray)
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((j_common_ptr) & cinfo, JPOOL_IMAGE, row_stride, 1);
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// Step 6: while (scan lines remain to be read)
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// jpeg_read_scanlines(...);
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// Here we use the library's state variable cinfo.output_scanline as the
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// loop counter, so that we don't have to keep track ourselves.
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int format = GL_RGB;
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if (cinfo.output_components == 1)
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format = GL_LUMINANCE;
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img = new Image(format, cinfo.image_width, cinfo.image_height);
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// cont = cinfo.output_height - 1;
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cont = 0;
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while (cinfo.output_scanline < cinfo.output_height)
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{
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// jpeg_read_scanlines expects an array of pointers to scanlines.
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// Here the array is only one element long, but you could ask for
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// more than one scanline at a time if that's more convenient.
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(void) jpeg_read_scanlines(&cinfo, buffer, 1);
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// Assume put_scanline_someplace wants a pointer and sample count.
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// put_scanline_someplace(buffer[0], row_stride);
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memcpy(img->getPixelRow(cont), buffer[0], row_stride);
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cont++;
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}
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// Step 7: Finish decompression
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(void) jpeg_finish_decompress(&cinfo);
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// We can ignore the return value since suspension is not possible
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// with the stdio data source.
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// Step 8: Release JPEG decompression object
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// This is an important step since it will release a good deal of memory.
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jpeg_destroy_decompress(&cinfo);
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// After finish_decompress, we can close the input file.
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// Here we postpone it until after no more JPEG errors are possible,
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// so as to simplify the setjmp error logic above. (Actually, I don't
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// think that jpeg_destroy can do an error exit, but why assume anything...
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fclose(in);
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// At this point you may want to check to see whether any corrupt-data
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// warnings occurred (test whether jerr.pub.num_warnings is nonzero).
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return img;
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|
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#elif TARGET_OS_MAC
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|
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Image* img = NULL;
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CGBuffer* cgJpegImage;
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size_t img_w, img_h, img_d;
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cgJpegImage = new CGBuffer(filename.c_str());
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if (cgJpegImage == NULL) {
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char tempcwd[2048];
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getcwd(tempcwd, sizeof(tempcwd));
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DPRINTF(0, "CGBuffer :: Error opening JPEG image file %s/%s\n", tempcwd, filename.c_str());
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delete cgJpegImage;
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return NULL;
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}
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|
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if (!cgJpegImage->LoadJPEG()) {
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char tempcwd[2048];
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getcwd(tempcwd, sizeof(tempcwd));
|
|
DPRINTF(0, "CGBuffer :: Error loading JPEG image file %s/%s\n", tempcwd, filename.c_str());
|
|
delete cgJpegImage;
|
|
return NULL;
|
|
}
|
|
|
|
cgJpegImage->Render();
|
|
|
|
img_w = (size_t) cgJpegImage->image_size.width;
|
|
img_h = (size_t) cgJpegImage->image_size.height;
|
|
img_d = (size_t) ((cgJpegImage->image_depth == 8) ? 1 : 4);
|
|
|
|
// DPRINTF(0,"cgJpegImage :: %d x %d x %d [%d] bpp\n", img_w, img_h, (size_t)cgJpegImage->image_depth, img_d);
|
|
|
|
#ifdef MACOSX_ALPHA_JPEGS
|
|
int format = (img_d == 1) ? GL_LUMINANCE : GL_RGBA;
|
|
#else
|
|
int format = (img_d == 1) ? GL_LUMINANCE : GL_RGB;
|
|
#endif
|
|
img = new Image(format, img_w, img_h);
|
|
if (img == NULL || img->getPixels() == NULL) {
|
|
DPRINTF(0, "Could not create image\n");
|
|
delete cgJpegImage;
|
|
return NULL;
|
|
}
|
|
// following code flips image and skips alpha byte if no alpha support
|
|
unsigned char* bout = (unsigned char*) img->getPixels();
|
|
unsigned char* bin = (unsigned char*) cgJpegImage->buffer->data;
|
|
unsigned int bcount = img_w * img_h * img_d;
|
|
unsigned int i = 0;
|
|
bin += bcount+(img_w*img_d); // start one row past end
|
|
for (i=0; i<bcount; ++i)
|
|
{
|
|
// at end of row, move back two rows
|
|
if ( (i % (img_w * img_d)) == 0 ) bin -= 2*(img_w * img_d);
|
|
|
|
#ifndef MACOSX_ALPHA_JPEGS
|
|
if (( (img_d != 1) && !((i&3)^3) )) // skip extra byte
|
|
{
|
|
++bin;
|
|
} else
|
|
#endif // !MACOSX_ALPHA_JPEGS
|
|
|
|
*bout++ = *bin++;
|
|
}
|
|
delete cgJpegImage;
|
|
return img;
|
|
|
|
#else
|
|
return NULL;
|
|
#endif // JPEG_SUPPORT
|
|
}
|
|
|
|
|
|
#ifdef PNG_SUPPORT
|
|
void PNGReadData(png_structp png_ptr, png_bytep data, png_size_t length)
|
|
{
|
|
FILE* fp = (FILE*) png_get_io_ptr(png_ptr);
|
|
fread((void*) data, 1, length, fp);
|
|
}
|
|
#endif
|
|
|
|
|
|
Image* LoadPNGImage(const string& filename)
|
|
{
|
|
#ifndef PNG_SUPPORT
|
|
return NULL;
|
|
#else
|
|
char header[8];
|
|
png_structp png_ptr;
|
|
png_infop info_ptr;
|
|
png_uint_32 width, height;
|
|
int bit_depth, color_type, interlace_type;
|
|
FILE* fp = NULL;
|
|
Image* img = NULL;
|
|
png_bytep* row_pointers = NULL;
|
|
|
|
fp = fopen(filename.c_str(), "rb");
|
|
if (fp == NULL)
|
|
{
|
|
clog << _("Error opening image file ") << filename << '\n';
|
|
return NULL;
|
|
}
|
|
|
|
fread(header, 1, sizeof(header), fp);
|
|
if (png_sig_cmp((unsigned char*) header, 0, sizeof(header)))
|
|
{
|
|
clog << _("Error: ") << filename << _(" is not a PNG file.\n");
|
|
fclose(fp);
|
|
return NULL;
|
|
}
|
|
|
|
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
|
|
NULL, NULL, NULL);
|
|
if (png_ptr == NULL)
|
|
{
|
|
fclose(fp);
|
|
return NULL;
|
|
}
|
|
|
|
info_ptr = png_create_info_struct(png_ptr);
|
|
if (info_ptr == NULL)
|
|
{
|
|
fclose(fp);
|
|
png_destroy_read_struct(&png_ptr, (png_infopp) NULL, (png_infopp) NULL);
|
|
return NULL;
|
|
}
|
|
|
|
if (setjmp(png_jmpbuf(png_ptr)))
|
|
{
|
|
fclose(fp);
|
|
if (img != NULL)
|
|
delete img;
|
|
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
|
|
clog << _("Error reading PNG image file ") << filename << '\n';
|
|
return NULL;
|
|
}
|
|
|
|
// png_init_io(png_ptr, fp);
|
|
png_set_read_fn(png_ptr, (void*) fp, PNGReadData);
|
|
png_set_sig_bytes(png_ptr, sizeof(header));
|
|
|
|
png_read_info(png_ptr, info_ptr);
|
|
|
|
png_get_IHDR(png_ptr, info_ptr,
|
|
&width, &height, &bit_depth,
|
|
&color_type, &interlace_type,
|
|
NULL, NULL);
|
|
|
|
GLenum glformat = GL_RGB;
|
|
switch (color_type)
|
|
{
|
|
case PNG_COLOR_TYPE_GRAY:
|
|
glformat = GL_LUMINANCE;
|
|
break;
|
|
case PNG_COLOR_TYPE_GRAY_ALPHA:
|
|
glformat = GL_LUMINANCE_ALPHA;
|
|
break;
|
|
case PNG_COLOR_TYPE_RGB:
|
|
glformat = GL_RGB;
|
|
break;
|
|
case PNG_COLOR_TYPE_PALETTE:
|
|
case PNG_COLOR_TYPE_RGB_ALPHA:
|
|
glformat = GL_RGBA;
|
|
break;
|
|
default:
|
|
// badness
|
|
break;
|
|
}
|
|
|
|
img = new Image(glformat, width, height);
|
|
if (img == NULL)
|
|
{
|
|
fclose(fp);
|
|
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
|
|
return NULL;
|
|
}
|
|
|
|
// TODO: consider using paletted textures if they're available
|
|
if (color_type == PNG_COLOR_TYPE_PALETTE)
|
|
{
|
|
png_set_palette_to_rgb(png_ptr);
|
|
}
|
|
|
|
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
|
|
{
|
|
png_set_expand_gray_1_2_4_to_8(png_ptr);
|
|
}
|
|
|
|
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
|
|
{
|
|
png_set_tRNS_to_alpha(png_ptr);
|
|
}
|
|
|
|
// TODO: consider passing images with < 8 bits/component to
|
|
// GL without expanding
|
|
if (bit_depth == 16)
|
|
png_set_strip_16(png_ptr);
|
|
else if (bit_depth < 8)
|
|
png_set_packing(png_ptr);
|
|
|
|
row_pointers = new png_bytep[height];
|
|
for (unsigned int i = 0; i < height; i++)
|
|
row_pointers[i] = (png_bytep) img->getPixelRow(i);
|
|
|
|
png_read_image(png_ptr, row_pointers);
|
|
|
|
delete[] row_pointers;
|
|
|
|
png_read_end(png_ptr, NULL);
|
|
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
|
|
|
|
fclose(fp);
|
|
|
|
return img;
|
|
#endif
|
|
}
|
|
|
|
|
|
// BMP file definitions--can't use windows.h because we might not be
|
|
// built on Windows!
|
|
typedef struct
|
|
{
|
|
unsigned char b;
|
|
unsigned char m;
|
|
unsigned int size;
|
|
unsigned int reserved;
|
|
unsigned int offset;
|
|
} BMPFileHeader;
|
|
|
|
typedef struct
|
|
{
|
|
unsigned int size;
|
|
int width;
|
|
int height;
|
|
unsigned short planes;
|
|
unsigned short bpp;
|
|
unsigned int compression;
|
|
unsigned int imageSize;
|
|
int widthPPM;
|
|
int heightPPM;
|
|
unsigned int colorsUsed;
|
|
unsigned int colorsImportant;
|
|
} BMPImageHeader;
|
|
|
|
|
|
static int readInt(ifstream& in)
|
|
{
|
|
unsigned char b[4];
|
|
in.read(reinterpret_cast<char*>(b), 4);
|
|
return ((int) b[3] << 24) + ((int) b[2] << 16)
|
|
+ ((int) b[1] << 8) + (int) b[0];
|
|
}
|
|
|
|
static short readShort(ifstream& in)
|
|
{
|
|
unsigned char b[2];
|
|
in.read(reinterpret_cast<char*>(b), 2);
|
|
return ((short) b[1] << 8) + (short) b[0];
|
|
}
|
|
|
|
|
|
static Image* LoadBMPImage(ifstream& in)
|
|
{
|
|
BMPFileHeader fileHeader;
|
|
BMPImageHeader imageHeader;
|
|
unsigned char* pixels;
|
|
|
|
in >> fileHeader.b;
|
|
in >> fileHeader.m;
|
|
fileHeader.size = readInt(in);
|
|
fileHeader.reserved = readInt(in);
|
|
fileHeader.offset = readInt(in);
|
|
|
|
if (fileHeader.b != 'B' || fileHeader.m != 'M')
|
|
return NULL;
|
|
|
|
imageHeader.size = readInt(in);
|
|
imageHeader.width = readInt(in);
|
|
imageHeader.height = readInt(in);
|
|
imageHeader.planes = readShort(in);
|
|
imageHeader.bpp = readShort(in);
|
|
imageHeader.compression = readInt(in);
|
|
imageHeader.imageSize = readInt(in);
|
|
imageHeader.widthPPM = readInt(in);
|
|
imageHeader.heightPPM = readInt(in);
|
|
imageHeader.colorsUsed = readInt(in);
|
|
imageHeader.colorsImportant = readInt(in);
|
|
|
|
if (imageHeader.width <= 0 || imageHeader.height <= 0)
|
|
return NULL;
|
|
|
|
// We currently don't support compressed BMPs
|
|
if (imageHeader.compression != 0)
|
|
return NULL;
|
|
// We don't handle 1-, 2-, or 4-bpp images
|
|
if (imageHeader.bpp != 8 && imageHeader.bpp != 24 && imageHeader.bpp != 32)
|
|
return NULL;
|
|
|
|
unsigned char* palette = NULL;
|
|
if (imageHeader.bpp == 8)
|
|
{
|
|
printf("Reading %d color palette\n", imageHeader.colorsUsed);
|
|
palette = new unsigned char[imageHeader.colorsUsed * 4];
|
|
in.read(reinterpret_cast<char*>(palette), imageHeader.colorsUsed * 4);
|
|
}
|
|
|
|
in.seekg(fileHeader.offset, ios::beg);
|
|
|
|
unsigned int bytesPerRow =
|
|
(imageHeader.width * imageHeader.bpp / 8 + 1) & ~1;
|
|
unsigned int imageBytes = bytesPerRow * imageHeader.height;
|
|
|
|
// slurp the image data
|
|
pixels = new unsigned char[imageBytes];
|
|
in.read(reinterpret_cast<char*>(pixels), imageBytes);
|
|
|
|
// check for truncated file
|
|
|
|
Image* img = new Image(GL_RGB, imageHeader.width, imageHeader.height);
|
|
if (img == NULL)
|
|
{
|
|
delete[] pixels;
|
|
return NULL;
|
|
}
|
|
|
|
// Copy the image and perform any necessary conversions
|
|
for (int y = 0; y < imageHeader.height; y++)
|
|
{
|
|
unsigned char* src = &pixels[y * bytesPerRow];
|
|
unsigned char* dst = img->getPixelRow(y);
|
|
|
|
switch (imageHeader.bpp)
|
|
{
|
|
case 8:
|
|
{
|
|
for (int x = 0; x < imageHeader.width; x++)
|
|
{
|
|
unsigned char* color = palette + (*src << 2);
|
|
dst[0] = color[2];
|
|
dst[1] = color[1];
|
|
dst[2] = color[0];
|
|
src++;
|
|
dst += 3;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 24:
|
|
{
|
|
for (int x = 0; x < imageHeader.width; x++)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
src += 3;
|
|
dst += 3;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case 32:
|
|
{
|
|
for (int x = 0; x < imageHeader.width; x++)
|
|
{
|
|
dst[0] = src[2];
|
|
dst[1] = src[1];
|
|
dst[2] = src[0];
|
|
src += 4;
|
|
dst += 3;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
delete[] pixels;
|
|
|
|
return img;
|
|
}
|
|
|
|
|
|
Image* LoadBMPImage(const string& filename)
|
|
{
|
|
ifstream bmpFile(filename.c_str(), ios::in | ios::binary);
|
|
|
|
if (bmpFile.good())
|
|
{
|
|
Image* img = LoadBMPImage(bmpFile);
|
|
bmpFile.close();
|
|
return img;
|
|
}
|
|
else
|
|
{
|
|
return NULL;
|
|
}
|
|
}
|