218 lines
5.9 KiB
C++
218 lines
5.9 KiB
C++
// dds.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 <iostream>
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#include <fstream>
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#include <algorithm>
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#include <celutil/debug.h>
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#include <celutil/bytes.h>
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#include <celengine/image.h>
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#include "glsupport.h"
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using namespace celestia;
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using namespace std;
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struct DDPixelFormat
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{
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uint32_t size;
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uint32_t flags;
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uint32_t fourCC;
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uint32_t bpp;
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uint32_t redMask;
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uint32_t greenMask;
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uint32_t blueMask;
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uint32_t alphaMask;
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};
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struct DDSCaps
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{
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uint32_t caps;
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uint32_t caps2;
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uint32_t caps3;
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uint32_t caps4;
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};
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struct DDColorKey
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{
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uint32_t lowVal;
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uint32_t highVal;
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};
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struct DDSurfaceDesc
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{
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uint32_t size;
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uint32_t flags;
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uint32_t height;
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uint32_t width;
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uint32_t pitch;
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uint32_t depth;
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uint32_t mipMapLevels;
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uint32_t alphaBitDepth;
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uint32_t reserved;
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uint32_t surface;
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DDColorKey ckDestOverlay;
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DDColorKey ckDestBlt;
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DDColorKey ckSrcOverlay;
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DDColorKey ckSrcBlt;
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DDPixelFormat format;
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DDSCaps caps;
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uint32_t textureStage;
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};
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static uint32_t FourCC(const char* s)
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{
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return (((uint32_t) s[3] << 24) |
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((uint32_t) s[2] << 16) |
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((uint32_t) s[1] << 8) |
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(uint32_t) s[0]);
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}
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#define DDPF_RGB 0x40
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#define DDPF_FOURCC 0x04
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Image* LoadDDSImage(const fs::path& filename)
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{
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ifstream in(filename.string(), ios::in | ios::binary);
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if (!in.good())
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{
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DPRINTF(LOG_LEVEL_ERROR, "Error opening DDS texture file %s.\n", filename);
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return nullptr;
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}
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char header[4];
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in.read(header, sizeof header);
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if (header[0] != 'D' || header[1] != 'D' ||
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header[2] != 'S' || header[3] != ' ')
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{
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DPRINTF(LOG_LEVEL_ERROR, "DDS texture file %s has bad header.\n", filename);
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return nullptr;
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}
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DDSurfaceDesc ddsd;
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in.read(reinterpret_cast<char*>(&ddsd), sizeof ddsd);
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LE_TO_CPU_INT32(ddsd.size, ddsd.size);
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LE_TO_CPU_INT32(ddsd.pitch, ddsd.pitch);
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LE_TO_CPU_INT32(ddsd.width, ddsd.width);
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LE_TO_CPU_INT32(ddsd.height, ddsd.height);
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LE_TO_CPU_INT32(ddsd.mipMapLevels, ddsd.mipMapLevels);
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LE_TO_CPU_INT32(ddsd.format.flags, ddsd.format.flags);
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LE_TO_CPU_INT32(ddsd.format.redMask, ddsd.format.redMask);
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LE_TO_CPU_INT32(ddsd.format.greenMask, ddsd.format.greenMask);
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LE_TO_CPU_INT32(ddsd.format.blueMask, ddsd.format.blueMask);
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LE_TO_CPU_INT32(ddsd.format.alphaMask, ddsd.format.alphaMask);
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LE_TO_CPU_INT32(ddsd.format.bpp, ddsd.format.bpp);
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LE_TO_CPU_INT32(ddsd.format.fourCC, ddsd.format.fourCC);
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int format = -1;
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if (ddsd.format.fourCC != 0)
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{
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if (ddsd.format.fourCC == FourCC("DXT1"))
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{
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format = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
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}
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else if (ddsd.format.fourCC == FourCC("DXT3"))
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{
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format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
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}
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else if (ddsd.format.fourCC == FourCC("DXT5"))
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{
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format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
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}
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else
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{
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cerr << "Unknown FourCC in DDS file: " << ddsd.format.fourCC;
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}
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}
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else
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{
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clog << "DDS Format: " << ddsd.format.fourCC << '\n';
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if (ddsd.format.bpp == 32)
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{
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if (ddsd.format.redMask == 0x00ff0000 &&
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ddsd.format.greenMask == 0x0000ff00 &&
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ddsd.format.blueMask == 0x000000ff &&
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ddsd.format.alphaMask == 0xff000000)
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{
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format = GL_BGRA_EXT;
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}
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else if (ddsd.format.redMask == 0x000000ff &&
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ddsd.format.greenMask == 0x0000ff00 &&
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ddsd.format.blueMask == 0x00ff0000 &&
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ddsd.format.alphaMask == 0xff000000)
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{
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format = GL_RGBA;
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}
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}
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else if (ddsd.format.bpp == 24)
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{
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if (ddsd.format.redMask == 0x00ff0000 &&
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ddsd.format.greenMask == 0x0000ff00 &&
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ddsd.format.blueMask == 0x000000ff)
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{
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format = GL_BGR_EXT;
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}
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else if (ddsd.format.redMask == 0x000000ff &&
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ddsd.format.greenMask == 0x0000ff00 &&
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ddsd.format.blueMask == 0x00ff0000)
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{
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format = GL_RGB;
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}
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}
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}
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if (format == -1)
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{
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DPRINTF(LOG_LEVEL_ERROR, "Unsupported format for DDS texture file %s.\n", filename);
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return nullptr;
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}
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// If we have a compressed format, give up if S3 texture compression
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// isn't supported
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if (format == GL_COMPRESSED_RGBA_S3TC_DXT1_EXT ||
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format == GL_COMPRESSED_RGBA_S3TC_DXT3_EXT ||
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format == GL_COMPRESSED_RGBA_S3TC_DXT5_EXT)
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{
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if (!gl::EXT_texture_compression_s3tc)
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return nullptr;
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}
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// TODO: Verify that the reported texture size matches the amount of
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// data expected.
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Image* img = new Image(format,
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(int) ddsd.width,
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(int) ddsd.height,
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max(ddsd.mipMapLevels, 1u));
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in.read(reinterpret_cast<char*>(img->getPixels()), img->getSize());
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if (!in.eof() && !in.good())
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{
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DPRINTF(LOG_LEVEL_ERROR, "Failed reading data from DDS texture file %s.\n", filename);
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delete img;
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return nullptr;
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}
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#if 0
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cout << "sizeof(ddsd) = " << sizeof(ddsd) << '\n';
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cout << "dimensions: " << ddsd.width << 'x' << ddsd.height << '\n';
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cout << "mipmap levels: " << ddsd.mipMapLevels << '\n';
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cout << "fourCC: " << ddsd.format.fourCC << '\n';
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cout << "bpp: " << ddsd.format.bpp << '\n';
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#endif
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return img;
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}
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