projects/dwt-win: dwt/internal/image/PngIhdrChunk.d annotate

author	Frank Benoit <benoit@tionex.de>
date	Wed, 23 Jan 2008 12:01:46 +0100
parents
children	9a64a7781bab

rev	line source
2 57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	1 /*******************************************************************************
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	2 * Copyright (c) 2000, 2006 IBM Corporation and others.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	3 * All rights reserved. This program and the accompanying materials
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	4 * are made available under the terms of the Eclipse Public License v1.0
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	5 * which accompanies this distribution, and is available at
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	6 * http://www.eclipse.org/legal/epl-v10.html
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	7 *
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	8 * Contributors:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	9 * IBM Corporation - initial API and implementation
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	10 * Port to the D programming language:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	11 * Frank Benoit <benoit@tionex.de>
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	12 *******************************************************************************/
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	13 module dwt.internal.image.PngIhdrChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	14
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	15
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	16 import dwt.DWT;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	17 import dwt.graphics.PaletteData;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	18 import dwt.graphics.RGB;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	19 import dwt.internal.image.PngFileReadState;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	20 import dwt.internal.image.PngIhdrChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	21 import dwt.internal.image.PngChunk;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	22 import tango.text.convert.Format;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	23
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	24 class PngIhdrChunk : PngChunk {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	25 static const int IHDR_DATA_LENGTH = 13;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	26
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	27 static const int WIDTH_DATA_OFFSET = DATA_OFFSET + 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	28 static const int HEIGHT_DATA_OFFSET = DATA_OFFSET + 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	29 static const int BIT_DEPTH_OFFSET = DATA_OFFSET + 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	30 static const int COLOR_TYPE_OFFSET = DATA_OFFSET + 9;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	31 static const int COMPRESSION_METHOD_OFFSET = DATA_OFFSET + 10;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	32 static const int FILTER_METHOD_OFFSET = DATA_OFFSET + 11;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	33 static const int INTERLACE_METHOD_OFFSET = DATA_OFFSET + 12;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	34
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	35 static const byte COLOR_TYPE_GRAYSCALE = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	36 static const byte COLOR_TYPE_RGB = 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	37 static const byte COLOR_TYPE_PALETTE = 3;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	38 static const byte COLOR_TYPE_GRAYSCALE_WITH_ALPHA = 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	39 static const byte COLOR_TYPE_RGB_WITH_ALPHA = 6;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	40
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	41 static const int INTERLACE_METHOD_NONE = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	42 static const int INTERLACE_METHOD_ADAM7 = 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	43
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	44 static const int FILTER_NONE = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	45 static const int FILTER_SUB = 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	46 static const int FILTER_UP = 2;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	47 static const int FILTER_AVERAGE = 3;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	48 static const int FILTER_PAETH = 4;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	49
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	50 static const byte[] ValidBitDepths = [ cast(byte)1, 2, 4, 8, 16];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	51 static const byte[] ValidColorTypes = [ cast(byte)0, 2, 3, 4, 6];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	52
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	53 int width, height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	54 byte bitDepth, colorType, compressionMethod, filterMethod, interlaceMethod;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	55
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	56 this(int width, int height, byte bitDepth, byte colorType, byte compressionMethod, byte filterMethod, byte interlaceMethod) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	57 super(IHDR_DATA_LENGTH);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	58 setType(TYPE_IHDR);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	59 setWidth(width);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	60 setHeight(height);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	61 setBitDepth(bitDepth);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	62 setColorType(colorType);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	63 setCompressionMethod(compressionMethod);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	64 setFilterMethod(filterMethod);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	65 setInterlaceMethod(interlaceMethod);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	66 setCRC(computeCRC());
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	67 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	68
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	69 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	70 * Construct a PNGChunk using the reference bytes
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	71 * given.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	72 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	73 this(byte[] reference) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	74 super(reference);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	75 if (reference.length <= IHDR_DATA_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	76 width = getInt32(WIDTH_DATA_OFFSET);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	77 height = getInt32(HEIGHT_DATA_OFFSET);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	78 bitDepth = reference[BIT_DEPTH_OFFSET];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	79 colorType = reference[COLOR_TYPE_OFFSET];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	80 compressionMethod = reference[COMPRESSION_METHOD_OFFSET];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	81 filterMethod = reference[FILTER_METHOD_OFFSET];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	82 interlaceMethod = reference[INTERLACE_METHOD_OFFSET];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	83 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	84
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	85 int getChunkType() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	86 return CHUNK_IHDR;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	87 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	88
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	89 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	90 * Get the image's width in pixels.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	91 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	92 int getWidth() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	93 return width;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	94 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	95
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	96 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	97 * Set the image's width in pixels.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	98 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	99 void setWidth(int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	100 setInt32(WIDTH_DATA_OFFSET, value);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	101 width = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	102 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	103
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	104 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	105 * Get the image's height in pixels.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	106 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	107 int getHeight() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	108 return height;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	109 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	110
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	111 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	112 * Set the image's height in pixels.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	113 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	114 void setHeight(int value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	115 setInt32(HEIGHT_DATA_OFFSET, value);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	116 height = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	117 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	118
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	119 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	120 * Get the image's bit depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	121 * This is limited to the values 1, 2, 4, 8, or 16.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	122 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	123 byte getBitDepth() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	124 return bitDepth;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	125 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	126
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	127 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	128 * Set the image's bit depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	129 * This is limited to the values 1, 2, 4, 8, or 16.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	130 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	131 void setBitDepth(byte value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	132 reference[BIT_DEPTH_OFFSET] = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	133 bitDepth = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	134 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	135
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	136 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	137 * Get the image's color type.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	138 * This is limited to the values:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	139 * 0 - Grayscale image.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	140 * 2 - RGB triple.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	141 * 3 - Palette.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	142 * 4 - Grayscale with Alpha channel.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	143 * 6 - RGB with Alpha channel.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	144 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	145 byte getColorType() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	146 return colorType;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	147 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	148
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	149 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	150 * Set the image's color type.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	151 * This is limited to the values:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	152 * 0 - Grayscale image.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	153 * 2 - RGB triple.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	154 * 3 - Palette.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	155 * 4 - Grayscale with Alpha channel.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	156 * 6 - RGB with Alpha channel.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	157 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	158 void setColorType(byte value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	159 reference[COLOR_TYPE_OFFSET] = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	160 colorType = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	161 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	162
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	163 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	164 * Get the image's compression method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	165 * This value must be 0.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	166 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	167 byte getCompressionMethod() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	168 return compressionMethod;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	169 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	170
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	171 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	172 * Set the image's compression method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	173 * This value must be 0.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	174 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	175 void setCompressionMethod(byte value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	176 reference[COMPRESSION_METHOD_OFFSET] = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	177 compressionMethod = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	178 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	179
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	180 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	181 * Get the image's filter method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	182 * This value must be 0.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	183 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	184 byte getFilterMethod() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	185 return filterMethod;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	186 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	187
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	188 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	189 * Set the image's filter method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	190 * This value must be 0.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	191 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	192 void setFilterMethod(byte value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	193 reference[FILTER_METHOD_OFFSET] = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	194 filterMethod = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	195 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	196
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	197 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	198 * Get the image's interlace method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	199 * This value is limited to:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	200 * 0 - No interlacing used.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	201 * 1 - Adam7 interlacing used.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	202 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	203 byte getInterlaceMethod() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	204 return interlaceMethod;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	205 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	206
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	207 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	208 * Set the image's interlace method.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	209 * This value is limited to:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	210 * 0 - No interlacing used.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	211 * 1 - Adam7 interlacing used.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	212 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	213 void setInterlaceMethod(byte value) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	214 reference[INTERLACE_METHOD_OFFSET] = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	215 interlaceMethod = value;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	216 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	217
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	218 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	219 * Answer whether the chunk is a valid IHDR chunk.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	220 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	221 void validate(PngFileReadState readState, PngIhdrChunk headerChunk) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	222 // An IHDR chunk is invalid if any other chunk has
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	223 // been read.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	224 if (readState.readIHDR
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	225 \|\| readState.readPLTE
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	226 \|\| readState.readIDAT
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	227 \|\| readState.readIEND)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	228 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	229 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	230 } else {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	231 readState.readIHDR = true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	232 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	233
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	234 super.validate(readState, headerChunk);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	235
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	236 if (length !is IHDR_DATA_LENGTH) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	237 if (compressionMethod !is 0) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	238 if (interlaceMethod !is INTERLACE_METHOD_NONE &&
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	239 interlaceMethod !is INTERLACE_METHOD_ADAM7) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	240 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	241 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	242
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	243 bool colorTypeIsValid = false;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	244 for (int i = 0; i < ValidColorTypes.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	245 if (ValidColorTypes[i] is colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	246 colorTypeIsValid = true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	247 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	248 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	249 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	250 if (!colorTypeIsValid) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	251
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	252 bool bitDepthIsValid = false;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	253 for (int i = 0; i < ValidBitDepths.length; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	254 if (ValidBitDepths[i] is bitDepth) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	255 bitDepthIsValid = true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	256 break;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	257 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	258 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	259 if (!bitDepthIsValid) DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	260
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	261 if ((colorType is COLOR_TYPE_RGB
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	262 \|\| colorType is COLOR_TYPE_RGB_WITH_ALPHA
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	263 \|\| colorType is COLOR_TYPE_GRAYSCALE_WITH_ALPHA)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	264 && bitDepth < 8)
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	265 {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	266 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	267 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	268
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	269 if (colorType is COLOR_TYPE_PALETTE && bitDepth > 8) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	270 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	271 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	272 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	273
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	274 char[] getColorTypeString() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	275 switch (colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	276 case COLOR_TYPE_GRAYSCALE: return "Grayscale";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	277 case COLOR_TYPE_RGB: return "RGB";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	278 case COLOR_TYPE_PALETTE: return "Palette";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	279 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA: return "Grayscale with Alpha";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	280 case COLOR_TYPE_RGB_WITH_ALPHA: return "RGB with Alpha";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	281 default: return "Unknown - " ~ cast(char)colorType;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	282 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	283 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	284
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	285 char[] getFilterMethodString() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	286 switch (filterMethod) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	287 case FILTER_NONE: return "None";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	288 case FILTER_SUB: return "Sub";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	289 case FILTER_UP: return "Up";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	290 case FILTER_AVERAGE: return "Average";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	291 case FILTER_PAETH: return "Paeth";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	292 default: return "Unknown";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	293 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	294 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	295
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	296 char[] getInterlaceMethodString() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	297 switch (interlaceMethod) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	298 case INTERLACE_METHOD_NONE: return "Not Interlaced";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	299 case INTERLACE_METHOD_ADAM7: return "Interlaced - ADAM7";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	300 default: return "Unknown";
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	301 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	302 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	303
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	304 override char[] contributeToString() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	305 return Format( "\n\tWidth: {}\n\tHeight: {}\n\tBit Depth: {}\n\tColor Type: {}\n\tCompression Method: {}\n\tFilter Method: {}\n\tInterlace Method: {}",
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	306 width, height, bitDepth, getColorTypeString(), compressionMethod, getFilterMethodString(), getInterlaceMethodString() );
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	307 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	308
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	309 bool getMustHavePalette() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	310 return colorType is COLOR_TYPE_PALETTE;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	311 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	312
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	313 bool getCanHavePalette() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	314 return colorType !is COLOR_TYPE_GRAYSCALE &&
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	315 colorType !is COLOR_TYPE_GRAYSCALE_WITH_ALPHA;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	316 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	317
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	318 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	319 * Answer the pixel size in bits based on the color type
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	320 * and bit depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	321 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	322 int getBitsPerPixel() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	323 switch (colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	324 case COLOR_TYPE_RGB_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	325 return 4 * bitDepth;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	326 case COLOR_TYPE_RGB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	327 return 3 * bitDepth;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	328 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	329 return 2 * bitDepth;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	330 case COLOR_TYPE_GRAYSCALE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	331 case COLOR_TYPE_PALETTE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	332 return bitDepth;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	333 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	334 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	335 return 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	336 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	337 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	338
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	339 /**
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	340 * Answer the pixel size in bits based on the color type
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	341 * and bit depth.
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	342 */
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	343 int getSwtBitsPerPixel() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	344 switch (colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	345 case COLOR_TYPE_RGB_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	346 case COLOR_TYPE_RGB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	347 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	348 return 24;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	349 case COLOR_TYPE_GRAYSCALE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	350 case COLOR_TYPE_PALETTE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	351 return Math.min(bitDepth, 8);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	352 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	353 DWT.error(DWT.ERROR_INVALID_IMAGE);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	354 return 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	355 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	356 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	357
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	358 int getFilterByteOffset() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	359 if (bitDepth < 8) return 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	360 return getBitsPerPixel() / 8;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	361 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	362
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	363 bool usesDirectColor() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	364 switch (colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	365 case COLOR_TYPE_GRAYSCALE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	366 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	367 case COLOR_TYPE_RGB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	368 case COLOR_TYPE_RGB_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	369 return true;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	370 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	371 return false;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	372 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	373 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	374
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	375 PaletteData createGrayscalePalette() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	376 int depth = Math.min(bitDepth, 8);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	377 int max = (1 << depth) - 1;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	378 int delta = 255 / max;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	379 int gray = 0;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	380 RGB[] rgbs = new RGB[max + 1];
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	381 for (int i = 0; i <= max; i++) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	382 rgbs[i] = new RGB(gray, gray, gray);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	383 gray += delta;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	384 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	385 return new PaletteData(rgbs);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	386 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	387
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	388 PaletteData getPaletteData() {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	389 switch (colorType) {
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	390 case COLOR_TYPE_GRAYSCALE:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	391 return createGrayscalePalette();
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	392 case COLOR_TYPE_GRAYSCALE_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	393 case COLOR_TYPE_RGB:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	394 case COLOR_TYPE_RGB_WITH_ALPHA:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	395 return new PaletteData(0xFF0000, 0xFF00, 0xFF);
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	396 default:
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	397 return null;
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	398 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	399 }
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	400
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	401
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	402
57151e2793a2 More common modules from dwt-linux Frank Benoit <benoit@tionex.de> parents: diff changeset	403 }

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57151e2793a2 More common modules from dwt-linux