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391 lines
9.0 KiB
391 lines
9.0 KiB
/* This file is part of the KDE project
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Copyright (C) 2003 Dominik Seichter <domseichter@web.de>
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Copyright (C) 2004 Ignacio Castaño <castano@ludicon.com>
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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 Lesser GNU General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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*/
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/* this code supports:
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* reading:
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* uncompressed and run length encoded indexed, grey and color tga files.
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* image types 1, 2, 3, 9, 10 and 11.
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* only RGB color maps with no more than 256 colors.
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* pixel formats 8, 15, 24 and 32.
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* writing:
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* uncompressed true color tga files
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*/
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#include "tga.h"
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#include <assert.h>
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#include <tqimage.h>
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#include <tqdatastream.h>
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#include <kdebug.h>
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typedef TQ_UINT32 uint;
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typedef TQ_UINT16 ushort;
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typedef TQ_UINT8 uchar;
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namespace { // Private.
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// Header format of saved files.
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uchar targaMagic[12] = { 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
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enum TGAType {
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TGA_TYPE_INDEXED = 1,
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TGA_TYPE_RGB = 2,
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TGA_TYPE_GREY = 3,
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TGA_TYPE_RLE_INDEXED = 9,
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TGA_TYPE_RLE_RGB = 10,
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TGA_TYPE_RLE_GREY = 11
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};
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#define TGA_INTERLEAVE_MASK 0xc0
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#define TGA_INTERLEAVE_NONE 0x00
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#define TGA_INTERLEAVE_2WAY 0x40
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#define TGA_INTERLEAVE_4WAY 0x80
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#define TGA_ORIGIN_MASK 0x30
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#define TGA_ORIGIN_LEFT 0x00
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#define TGA_ORIGIN_RIGHT 0x10
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#define TGA_ORIGIN_LOWER 0x00
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#define TGA_ORIGIN_UPPER 0x20
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/** Tga Header. */
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struct TgaHeader {
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uchar id_length;
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uchar colormap_type;
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uchar image_type;
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ushort colormap_index;
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ushort colormap_length;
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uchar colormap_size;
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ushort x_origin;
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ushort y_origin;
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ushort width;
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ushort height;
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uchar pixel_size;
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uchar flags;
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enum { SIZE = 18 }; // const static int SIZE = 18;
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};
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static TQDataStream & operator>> ( TQDataStream & s, TgaHeader & head )
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{
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s >> head.id_length;
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s >> head.colormap_type;
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s >> head.image_type;
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s >> head.colormap_index;
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s >> head.colormap_length;
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s >> head.colormap_size;
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s >> head.x_origin;
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s >> head.y_origin;
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s >> head.width;
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s >> head.height;
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s >> head.pixel_size;
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s >> head.flags;
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return s;
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}
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static bool IsSupported( const TgaHeader & head )
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{
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if( head.image_type != TGA_TYPE_INDEXED &&
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head.image_type != TGA_TYPE_RGB &&
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head.image_type != TGA_TYPE_GREY &&
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head.image_type != TGA_TYPE_RLE_INDEXED &&
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head.image_type != TGA_TYPE_RLE_RGB &&
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head.image_type != TGA_TYPE_RLE_GREY )
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{
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return false;
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}
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if( head.image_type == TGA_TYPE_INDEXED ||
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head.image_type == TGA_TYPE_RLE_INDEXED )
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{
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if( head.colormap_length > 256 || head.colormap_size != 24 )
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{
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return false;
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}
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}
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if( head.width == 0 || head.height == 0 )
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{
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return false;
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}
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if( head.pixel_size != 8 && head.pixel_size != 16 &&
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head.pixel_size != 24 && head.pixel_size != 32 )
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{
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return false;
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}
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return true;
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}
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struct Color555 {
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ushort b : 5;
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ushort g : 5;
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ushort r : 5;
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};
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struct TgaHeaderInfo {
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bool rle;
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bool pal;
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bool rgb;
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bool grey;
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bool supported;
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TgaHeaderInfo( const TgaHeader & tga ) : rle(false), pal(false), rgb(false), grey(false), supported(true)
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{
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switch( tga.image_type ) {
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case TGA_TYPE_RLE_INDEXED:
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rle = true;
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// no break is intended!
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case TGA_TYPE_INDEXED:
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if( tga.colormap_type!=1 || tga.colormap_size!=24 || tga.colormap_length>256 ) {
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supported = false;
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}
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pal = true;
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break;
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case TGA_TYPE_RLE_RGB:
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rle = true;
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// no break is intended!
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case TGA_TYPE_RGB:
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rgb = true;
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break;
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case TGA_TYPE_RLE_GREY:
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rle = true;
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// no break is intended!
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case TGA_TYPE_GREY:
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grey = true;
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break;
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default:
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// Error, unknown image type.
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supported = false;
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}
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}
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};
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static bool LoadTGA( TQDataStream & s, const TgaHeader & tga, TQImage &img )
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{
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// Create image.
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if( !img.create( tga.width, tga.height, 32 )) {
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return false;
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}
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TgaHeaderInfo info(tga);
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if( !info.supported ) {
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// File not supported.
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kdDebug(399) << "This TGA file is not supported." << endl;
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return false;
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}
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// Bits 0-3 are the numbers of alpha bits (can be zero!)
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const int numAlphaBits = tga.flags & 0xf;
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// However alpha exists only in the 32 bit format.
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if( ( tga.pixel_size == 32 ) && ( tga.flags & 0xf ) ) {
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img.setAlphaBuffer( true );
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}
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uint pixel_size = (tga.pixel_size/8);
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uint size = tga.width * tga.height * pixel_size;
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if (size < 1)
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{
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kdDebug(399) << "This TGA file is broken with size " << size << endl;
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return false;
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}
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// Read palette.
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char palette[768];
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if( info.pal ) {
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// @todo Support palettes in other formats!
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s.readRawBytes( palette, 3 * tga.colormap_length );
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}
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// Allocate image.
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uchar * const image = new uchar[size];
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if( info.rle ) {
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// Decode image.
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char * dst = (char *)image;
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int num = size;
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while (num > 0) {
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// Get packet header.
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uchar c;
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s >> c;
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uint count = (c & 0x7f) + 1;
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num -= count * pixel_size;
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if (c & 0x80) {
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// RLE pixels.
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assert(pixel_size <= 8);
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char pixel[8];
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s.readRawBytes( pixel, pixel_size );
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do {
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memcpy(dst, pixel, pixel_size);
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dst += pixel_size;
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} while (--count);
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}
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else {
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// Raw pixels.
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count *= pixel_size;
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s.readRawBytes( dst, count );
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dst += count;
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}
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}
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}
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else {
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// Read raw image.
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s.readRawBytes( (char *)image, size );
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}
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// Convert image to internal format.
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int y_start, y_step, y_end;
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if( tga.flags & TGA_ORIGIN_UPPER ) {
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y_start = 0;
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y_step = 1;
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y_end = tga.height;
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}
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else {
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y_start = tga.height - 1;
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y_step = -1;
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y_end = -1;
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}
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uchar * src = image;
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for( int y = y_start; y != y_end; y += y_step ) {
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TQRgb * scanline = (TQRgb *) img.scanLine( y );
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if( info.pal ) {
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// Paletted.
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for( int x = 0; x < tga.width; x++ ) {
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uchar idx = *src++;
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scanline[x] = tqRgb( palette[3*idx+2], palette[3*idx+1], palette[3*idx+0] );
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}
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}
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else if( info.grey ) {
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// Greyscale.
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for( int x = 0; x < tga.width; x++ ) {
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scanline[x] = tqRgb( *src, *src, *src );
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src++;
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}
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}
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else {
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// True Color.
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if( tga.pixel_size == 16 ) {
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for( int x = 0; x < tga.width; x++ ) {
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Color555 c = *reinterpret_cast<Color555 *>(src);
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scanline[x] = tqRgb( (c.r << 3) | (c.r >> 2), (c.g << 3) | (c.g >> 2), (c.b << 3) | (c.b >> 2) );
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src += 2;
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}
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}
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else if( tga.pixel_size == 24 ) {
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for( int x = 0; x < tga.width; x++ ) {
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scanline[x] = tqRgb( src[2], src[1], src[0] );
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src += 3;
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}
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}
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else if( tga.pixel_size == 32 ) {
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for( int x = 0; x < tga.width; x++ ) {
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// ### TODO: verify with images having really some alpha data
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const uchar alpha = ( src[3] << ( 8 - numAlphaBits ) );
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scanline[x] = tqRgba( src[2], src[1], src[0], alpha );
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src += 4;
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}
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}
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}
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}
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// Free image.
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delete [] image;
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return true;
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}
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} // namespace
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KDE_EXPORT void kimgio_tga_read( TQImageIO *io )
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{
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//kdDebug(399) << "Loading TGA file!" << endl;
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TQDataStream s( io->ioDevice() );
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s.setByteOrder( TQDataStream::LittleEndian );
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// Read image header.
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TgaHeader tga;
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s >> tga;
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s.device()->at( TgaHeader::SIZE + tga.id_length );
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// Check image file format.
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if( s.atEnd() ) {
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kdDebug(399) << "This TGA file is not valid." << endl;
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io->setImage( TQImage() );
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io->setStatus( -1 );
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return;
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}
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// Check supported file types.
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if( !IsSupported(tga) ) {
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kdDebug(399) << "This TGA file is not supported." << endl;
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io->setImage( TQImage() );
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io->setStatus( -1 );
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return;
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}
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TQImage img;
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bool result = LoadTGA(s, tga, img);
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if( result == false ) {
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kdDebug(399) << "Error loading TGA file." << endl;
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io->setImage( TQImage() );
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io->setStatus( -1 );
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return;
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}
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io->setImage( img );
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io->setStatus( 0 );
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}
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KDE_EXPORT void kimgio_tga_write( TQImageIO *io )
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{
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TQDataStream s( io->ioDevice() );
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s.setByteOrder( TQDataStream::LittleEndian );
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const TQImage img = io->image();
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const bool hasAlpha = img.hasAlphaBuffer();
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for( int i = 0; i < 12; i++ )
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s << targaMagic[i];
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// write header
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s << TQ_UINT16( img.width() ); // width
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s << TQ_UINT16( img.height() ); // height
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s << TQ_UINT8( hasAlpha ? 32 : 24 ); // depth (24 bit RGB + 8 bit alpha)
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s << TQ_UINT8( hasAlpha ? 0x24 : 0x20 ); // top left image (0x20) + 8 bit alpha (0x4)
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for( int y = 0; y < img.height(); y++ )
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for( int x = 0; x < img.width(); x++ ) {
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const TQRgb color = img.pixel( x, y );
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s << TQ_UINT8( tqBlue( color ) );
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s << TQ_UINT8( tqGreen( color ) );
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s << TQ_UINT8( tqRed( color ) );
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if( hasAlpha )
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s << TQ_UINT8( tqAlpha( color ) );
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}
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io->setStatus( 0 );
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}
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