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-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/**
- * A namespace for image filter utilities.
- */
-var filter = {};
-
-/**
- * Create a filter from name and options.
- *
- * @param {string} name Maps to a filter method name.
- * @param {Object} options A map of filter-specific options.
- * @return {function(ImageData,ImageData,number,number)} created function.
- */
-filter.create = function(name, options) {
- var filterFunc = filter[name](options);
- return function() {
- var time = Date.now();
- filterFunc.apply(null, arguments);
- var dst = arguments[0];
- var mPixPerSec = dst.width * dst.height / 1000 / (Date.now() - time);
- ImageUtil.trace.report(name, Math.round(mPixPerSec * 10) / 10 + 'Mps');
- }
-};
-
-/**
- * Apply a filter to a image by splitting it into strips.
- *
- * To be used with large images to avoid freezing up the UI.
- *
- * @param {HTMLCanvasElement} dstCanvas Destination canvas.
- * @param {HTMLCanvasElement} srcCanvas Source canvas.
- * @param {function(ImageData,ImageData,number,number)} filterFunc Filter.
- * @param {function(number, number)} progressCallback Progress callback.
- * @param {number} maxPixelsPerStrip Pixel number to process at once.
- */
-filter.applyByStrips = function(
- dstCanvas, srcCanvas, filterFunc, progressCallback, maxPixelsPerStrip) {
- var dstContext = dstCanvas.getContext('2d');
- var srcContext = srcCanvas.getContext('2d');
- var source = srcContext.getImageData(0, 0, srcCanvas.width, srcCanvas.height);
-
- var stripCount = Math.ceil(srcCanvas.width * srcCanvas.height /
- (maxPixelsPerStrip || 1000000)); // 1 Mpix is a reasonable default.
-
- var strip = srcContext.getImageData(0, 0,
- srcCanvas.width, Math.ceil(srcCanvas.height / stripCount));
-
- var offset = 0;
-
- function filterStrip() {
- // If the strip overlaps the bottom of the source image we cannot shrink it
- // and we cannot fill it partially (since canvas.putImageData always draws
- // the entire buffer).
- // Instead we move the strip up several lines (converting those lines
- // twice is a small price to pay).
- if (offset > source.height - strip.height) {
- offset = source.height - strip.height;
- }
-
- filterFunc(strip, source, 0, offset);
- dstContext.putImageData(strip, 0, offset);
-
- offset += strip.height;
-
- if (offset < source.height) {
- setTimeout(filterStrip, 0);
- } else {
- ImageUtil.trace.reportTimer('filter-commit');
- }
-
- progressCallback(offset, source.height);
- }
-
- ImageUtil.trace.resetTimer('filter-commit');
- filterStrip();
-};
-
-/**
- * Return a color histogram for an image.
- *
- * @param {HTMLCanvasElement|ImageData} source Image data to analyze.
- * @return {{r: Array.<number>, g: Array.<number>, b: Array.<number>}}
- * histogram.
- */
-filter.getHistogram = function(source) {
- var imageData;
- if (source.constructor.name == 'HTMLCanvasElement') {
- imageData = source.getContext('2d').
- getImageData(0, 0, source.width, source.height);
- } else {
- imageData = source;
- }
-
- var r = [];
- var g = [];
- var b = [];
-
- for (var i = 0; i != 256; i++) {
- r.push(0);
- g.push(0);
- b.push(0);
- }
-
- var data = imageData.data;
- var maxIndex = 4 * imageData.width * imageData.height;
- for (var index = 0; index != maxIndex;) {
- r[data[index++]]++;
- g[data[index++]]++;
- b[data[index++]]++;
- index++;
- }
-
- return { r: r, g: g, b: b };
-};
-
-/**
- * Compute the function for every integer value from 0 up to maxArg.
- *
- * Rounds and clips the results to fit the [0..255] range.
- * Useful to speed up pixel manipulations.
- *
- * @param {number} maxArg Maximum argument value (inclusive).
- * @param {function(number): number} func Function to precompute.
- * @return {Uint8Array} Computed results.
- */
-filter.precompute = function(maxArg, func) {
- var results = new Uint8Array(maxArg + 1);
- for (var arg = 0; arg <= maxArg; arg++) {
- results[arg] = Math.max(0, Math.min(0xFF, Math.round(func(arg))));
- }
- return results;
-};
-
-/**
- * Convert pixels by applying conversion tables to each channel individually.
- *
- * @param {Array.<number>} rMap Red channel conversion table.
- * @param {Array.<number>} gMap Green channel conversion table.
- * @param {Array.<number>} bMap Blue channel conversion table.
- * @param {ImageData} dst Destination image data. Can be smaller than the
- * source, must completely fit inside the source.
- * @param {ImageData} src Source image data.
- * @param {number} offsetX Horizontal offset of dst relative to src.
- * @param {number} offsetY Vertical offset of dst relative to src.
- */
-filter.mapPixels = function(rMap, gMap, bMap, dst, src, offsetX, offsetY) {
- var dstData = dst.data;
- var dstWidth = dst.width;
- var dstHeight = dst.height;
-
- var srcData = src.data;
- var srcWidth = src.width;
- var srcHeight = src.height;
-
- if (offsetX < 0 || offsetX + dstWidth > srcWidth ||
- offsetY < 0 || offsetY + dstHeight > srcHeight)
- throw new Error('Invalid offset');
-
- var dstIndex = 0;
- for (var y = 0; y != dstHeight; y++) {
- var srcIndex = (offsetX + (offsetY + y) * srcWidth) * 4;
- for (var x = 0; x != dstWidth; x++) {
- dstData[dstIndex++] = rMap[srcData[srcIndex++]];
- dstData[dstIndex++] = gMap[srcData[srcIndex++]];
- dstData[dstIndex++] = bMap[srcData[srcIndex++]];
- dstIndex++;
- srcIndex++;
- }
- }
-};
-
-/**
- * Number of digits after period(in binary form) to preserve.
- * @type {number}
- */
-filter.FIXED_POINT_SHIFT = 16;
-
-/**
- * Maximum value that can be represented in fixed point without overflow.
- * @type {number}
- */
-filter.MAX_FLOAT_VALUE = 0x7FFFFFFF >> filter.FIXED_POINT_SHIFT;
-
-/**
- * Converts floating point to fixed.
- * @param {number} x Number to convert.
- * @return {number} Converted number.
- */
-filter.floatToFixedPoint = function(x) {
- // Math.round on negative arguments causes V8 to deoptimize the calling
- // function, so we are using >> 0 instead.
- return (x * (1 << filter.FIXED_POINT_SHIFT)) >> 0;
-};
-
-/**
- * Perform an image convolution with a symmetrical 5x5 matrix:
- *
- * 0 0 w3 0 0
- * 0 w2 w1 w2 0
- * w3 w1 w0 w1 w3
- * 0 w2 w1 w2 0
- * 0 0 w3 0 0
- *
- * @param {Array.<number>} weights See the picture above.
- * @param {ImageData} dst Destination image data. Can be smaller than the
- * source, must completely fit inside the source.
- * @param {ImageData} src Source image data.
- * @param {number} offsetX Horizontal offset of dst relative to src.
- * @param {number} offsetY Vertical offset of dst relative to src.
- */
-filter.convolve5x5 = function(weights, dst, src, offsetX, offsetY) {
- var w0 = filter.floatToFixedPoint(weights[0]);
- var w1 = filter.floatToFixedPoint(weights[1]);
- var w2 = filter.floatToFixedPoint(weights[2]);
- var w3 = filter.floatToFixedPoint(weights[3]);
-
- var dstData = dst.data;
- var dstWidth = dst.width;
- var dstHeight = dst.height;
- var dstStride = dstWidth * 4;
-
- var srcData = src.data;
- var srcWidth = src.width;
- var srcHeight = src.height;
- var srcStride = srcWidth * 4;
- var srcStride2 = srcStride * 2;
-
- if (offsetX < 0 || offsetX + dstWidth > srcWidth ||
- offsetY < 0 || offsetY + dstHeight > srcHeight)
- throw new Error('Invalid offset');
-
- // Javascript is not very good at inlining constants.
- // We inline manually and assert that the constant is equal to the variable.
- if (filter.FIXED_POINT_SHIFT != 16)
- throw new Error('Wrong fixed point shift');
-
- var margin = 2;
-
- var startX = Math.max(0, margin - offsetX);
- var endX = Math.min(dstWidth, srcWidth - margin - offsetX);
-
- var startY = Math.max(0, margin - offsetY);
- var endY = Math.min(dstHeight, srcHeight - margin - offsetY);
-
- for (var y = startY; y != endY; y++) {
- var dstIndex = y * dstStride + startX * 4;
- var srcIndex = (y + offsetY) * srcStride + (startX + offsetX) * 4;
-
- for (var x = startX; x != endX; x++) {
- for (var c = 0; c != 3; c++) {
- var sum = w0 * srcData[srcIndex] +
- w1 * (srcData[srcIndex - 4] +
- srcData[srcIndex + 4] +
- srcData[srcIndex - srcStride] +
- srcData[srcIndex + srcStride]) +
- w2 * (srcData[srcIndex - srcStride - 4] +
- srcData[srcIndex + srcStride - 4] +
- srcData[srcIndex - srcStride + 4] +
- srcData[srcIndex + srcStride + 4]) +
- w3 * (srcData[srcIndex - 8] +
- srcData[srcIndex + 8] +
- srcData[srcIndex - srcStride2] +
- srcData[srcIndex + srcStride2]);
- if (sum < 0)
- dstData[dstIndex++] = 0;
- else if (sum > 0xFF0000)
- dstData[dstIndex++] = 0xFF;
- else
- dstData[dstIndex++] = sum >> 16;
- srcIndex++;
- }
- srcIndex++;
- dstIndex++;
- }
- }
-};
-
-/**
- * Compute the average color for the image.
- *
- * @param {ImageData} imageData Image data to analyze.
- * @return {{r: number, g: number, b: number}} average color.
- */
-filter.getAverageColor = function(imageData) {
- var data = imageData.data;
- var width = imageData.width;
- var height = imageData.height;
-
- var total = 0;
- var r = 0;
- var g = 0;
- var b = 0;
-
- var maxIndex = 4 * width * height;
- for (var i = 0; i != maxIndex;) {
- total++;
- r += data[i++];
- g += data[i++];
- b += data[i++];
- i++;
- }
- if (total == 0) return { r: 0, g: 0, b: 0 };
- return { r: r / total, g: g / total, b: b / total };
-};
-
-/**
- * Compute the average color with more weight given to pixes at the center.
- *
- * @param {ImageData} imageData Image data to analyze.
- * @return {{r: number, g: number, b: number}} weighted average color.
- */
-filter.getWeightedAverageColor = function(imageData) {
- var data = imageData.data;
- var width = imageData.width;
- var height = imageData.height;
-
- var total = 0;
- var r = 0;
- var g = 0;
- var b = 0;
-
- var center = Math.floor(width / 2);
- var maxDist = center * Math.sqrt(2);
- maxDist *= 2; // Weaken the effect of distance
-
- var i = 0;
- for (var x = 0; x != width; x++) {
- for (var y = 0; y != height; y++) {
- var dist = Math.sqrt(
- (x - center) * (x - center) + (y - center) * (y - center));
- var weight = (maxDist - dist) / maxDist;
-
- total += weight;
- r += data[i++] * weight;
- g += data[i++] * weight;
- b += data[i++] * weight;
- i++;
- }
- }
- if (total == 0) return { r: 0, g: 0, b: 0 };
- return { r: r / total, g: g / total, b: b / total };
-};
-
-/**
- * Copy part of src image to dst, applying matrix color filter on-the-fly.
- *
- * The copied part of src should completely fit into dst (there is no clipping
- * on either side).
- *
- * @param {Array.<number>} matrix 3x3 color matrix.
- * @param {ImageData} dst Destination image data.
- * @param {ImageData} src Source image data.
- * @param {number} offsetX X offset in source to start processing.
- * @param {number} offsetY Y offset in source to start processing.
- */
-filter.colorMatrix3x3 = function(matrix, dst, src, offsetX, offsetY) {
- var c11 = filter.floatToFixedPoint(matrix[0]);
- var c12 = filter.floatToFixedPoint(matrix[1]);
- var c13 = filter.floatToFixedPoint(matrix[2]);
- var c21 = filter.floatToFixedPoint(matrix[3]);
- var c22 = filter.floatToFixedPoint(matrix[4]);
- var c23 = filter.floatToFixedPoint(matrix[5]);
- var c31 = filter.floatToFixedPoint(matrix[6]);
- var c32 = filter.floatToFixedPoint(matrix[7]);
- var c33 = filter.floatToFixedPoint(matrix[8]);
-
- var dstData = dst.data;
- var dstWidth = dst.width;
- var dstHeight = dst.height;
-
- var srcData = src.data;
- var srcWidth = src.width;
- var srcHeight = src.height;
-
- if (offsetX < 0 || offsetX + dstWidth > srcWidth ||
- offsetY < 0 || offsetY + dstHeight > srcHeight)
- throw new Error('Invalid offset');
-
- // Javascript is not very good at inlining constants.
- // We inline manually and assert that the constant is equal to the variable.
- if (filter.FIXED_POINT_SHIFT != 16)
- throw new Error('Wrong fixed point shift');
-
- var dstIndex = 0;
- for (var y = 0; y != dstHeight; y++) {
- var srcIndex = (offsetX + (offsetY + y) * srcWidth) * 4;
- for (var x = 0; x != dstWidth; x++) {
- var r = srcData[srcIndex++];
- var g = srcData[srcIndex++];
- var b = srcData[srcIndex++];
- srcIndex++;
-
- var rNew = r * c11 + g * c12 + b * c13;
- var gNew = r * c21 + g * c22 + b * c23;
- var bNew = r * c31 + g * c32 + b * c33;
-
- if (rNew < 0) {
- dstData[dstIndex++] = 0;
- } else if (rNew > 0xFF0000) {
- dstData[dstIndex++] = 0xFF;
- } else {
- dstData[dstIndex++] = rNew >> 16;
- }
-
- if (gNew < 0) {
- dstData[dstIndex++] = 0;
- } else if (gNew > 0xFF0000) {
- dstData[dstIndex++] = 0xFF;
- } else {
- dstData[dstIndex++] = gNew >> 16;
- }
-
- if (bNew < 0) {
- dstData[dstIndex++] = 0;
- } else if (bNew > 0xFF0000) {
- dstData[dstIndex++] = 0xFF;
- } else {
- dstData[dstIndex++] = bNew >> 16;
- }
-
- dstIndex++;
- }
- }
-};
-
-/**
- * Return a convolution filter function bound to specific weights.
- *
- * @param {Array.<number>} weights Weights for the convolution matrix
- * (not normalized).
- * @return {function(ImageData,ImageData,number,number)} Convolution filter.
- */
-filter.createConvolutionFilter = function(weights) {
- // Normalize the weights to sum to 1.
- var total = 0;
- for (var i = 0; i != weights.length; i++) {
- total += weights[i] * (i ? 4 : 1);
- }
-
- var normalized = [];
- for (i = 0; i != weights.length; i++) {
- normalized.push(weights[i] / total);
- }
- for (; i < 4; i++) {
- normalized.push(0);
- }
-
- var maxWeightedSum = 0xFF *
- Math.abs(normalized[0]) +
- Math.abs(normalized[1]) * 4 +
- Math.abs(normalized[2]) * 4 +
- Math.abs(normalized[3]) * 4;
- if (maxWeightedSum > filter.MAX_FLOAT_VALUE)
- throw new Error('convolve5x5 cannot convert the weights to fixed point');
-
- return filter.convolve5x5.bind(null, normalized);
-};
-
-/**
- * Creates matrix filter.
- * @param {Array.<number>} matrix Color transformation matrix.
- * @return {function(ImageData,ImageData,number,number)} Matrix filter.
- */
-filter.createColorMatrixFilter = function(matrix) {
- for (var r = 0; r != 3; r++) {
- var maxRowSum = 0;
- for (var c = 0; c != 3; c++) {
- maxRowSum += 0xFF * Math.abs(matrix[r * 3 + c]);
- }
- if (maxRowSum > filter.MAX_FLOAT_VALUE)
- throw new Error(
- 'colorMatrix3x3 cannot convert the matrix to fixed point');
- }
- return filter.colorMatrix3x3.bind(null, matrix);
-};
-
-/**
- * Return a blur filter.
- * @param {Object} options Blur options.
- * @return {function(ImageData,ImageData,number,number)} Blur filter.
- */
-filter.blur = function(options) {
- if (options.radius == 1)
- return filter.createConvolutionFilter(
- [1, options.strength]);
- else if (options.radius == 2)
- return filter.createConvolutionFilter(
- [1, options.strength, options.strength]);
- else
- return filter.createConvolutionFilter(
- [1, options.strength, options.strength, options.strength]);
-};
-
-/**
- * Return a sharpen filter.
- * @param {Object} options Sharpen options.
- * @return {function(ImageData,ImageData,number,number)} Sharpen filter.
- */
-filter.sharpen = function(options) {
- if (options.radius == 1)
- return filter.createConvolutionFilter(
- [5, -options.strength]);
- else if (options.radius == 2)
- return filter.createConvolutionFilter(
- [10, -options.strength, -options.strength]);
- else
- return filter.createConvolutionFilter(
- [15, -options.strength, -options.strength, -options.strength]);
-};
-
-/**
- * Return an exposure filter.
- * @param {Object} options exposure options.
- * @return {function(ImageData,ImageData,number,number)} Exposure filter.
- */
-filter.exposure = function(options) {
- var pixelMap = filter.precompute(
- 255,
- function(value) {
- if (options.brightness > 0) {
- value *= (1 + options.brightness);
- } else {
- value += (0xFF - value) * options.brightness;
- }
- return 0x80 +
- (value - 0x80) * Math.tan((options.contrast + 1) * Math.PI / 4);
- });
-
- return filter.mapPixels.bind(null, pixelMap, pixelMap, pixelMap);
-};
-
-/**
- * Return a color autofix filter.
- * @param {Object} options Histogram for autofix.
- * @return {function(ImageData,ImageData,number,number)} Autofix filter.
- */
-filter.autofix = function(options) {
- return filter.mapPixels.bind(null,
- filter.autofix.stretchColors(options.histogram.r),
- filter.autofix.stretchColors(options.histogram.g),
- filter.autofix.stretchColors(options.histogram.b));
-};
-
-/**
- * Return a conversion table that stretches the range of colors used
- * in the image to 0..255.
- * @param {Array.<number>} channelHistogram Histogram to calculate range.
- * @return {Uint8Array} Color mapping array.
- */
-filter.autofix.stretchColors = function(channelHistogram) {
- var range = filter.autofix.getRange(channelHistogram);
- return filter.precompute(
- 255,
- function(x) {
- return (x - range.first) / (range.last - range.first) * 255;
- }
- );
-};
-
-/**
- * Return a range that encloses non-zero elements values in a histogram array.
- * @param {Array.<number>} channelHistogram Histogram to analyze.
- * @return {{first: number, last: number}} Channel range in histogram.
- */
-filter.autofix.getRange = function(channelHistogram) {
- var first = 0;
- while (first < channelHistogram.length && channelHistogram[first] == 0)
- first++;
-
- var last = channelHistogram.length - 1;
- while (last >= 0 && channelHistogram[last] == 0)
- last--;
-
- if (first >= last) // Stretching does not make sense
- return {first: 0, last: channelHistogram.length - 1};
- else
- return {first: first, last: last};
-};
-
-/**
- * Minimum channel offset that makes visual difference. If autofix calculated
- * offset is less than SENSITIVITY, probably autofix is not needed.
- * Reasonable empirical value.
- * @type {number}
- */
-filter.autofix.SENSITIVITY = 8;
-
-/**
- * @param {Array.<number>} channelHistogram Histogram to analyze.
- * @return {boolean} True if stretching this range to 0..255 would make
- * a visible difference.
- */
-filter.autofix.needsStretching = function(channelHistogram) {
- var range = filter.autofix.getRange(channelHistogram);
- return (range.first >= filter.autofix.SENSITIVITY ||
- range.last <= 255 - filter.autofix.SENSITIVITY);
-};
-
-/**
- * @param {{r: Array.<number>, g: Array.<number>, b: Array.<number>}} histogram
- * @return {boolean} True if the autofix would make a visible difference.
- */
-filter.autofix.isApplicable = function(histogram) {
- return filter.autofix.needsStretching(histogram.r) ||
- filter.autofix.needsStretching(histogram.g) ||
- filter.autofix.needsStretching(histogram.b);
-};
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-07 13:33:50 +0000