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-/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
-/* vim: set shiftwidth=2 tabstop=2 autoindent cindent expandtab: */
-/* Copyright 2014 Mozilla Foundation
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/* globals CanvasGraphics, CachedCanvases, ColorSpace, Util, error, info,
- isArray, makeCssRgb, WebGLUtils */
-
-'use strict';
-
-var ShadingIRs = {};
-
-ShadingIRs.RadialAxial = {
- fromIR: function RadialAxial_fromIR(raw) {
- var type = raw[1];
- var colorStops = raw[2];
- var p0 = raw[3];
- var p1 = raw[4];
- var r0 = raw[5];
- var r1 = raw[6];
- return {
- type: 'Pattern',
- getPattern: function RadialAxial_getPattern(ctx) {
- var grad;
- if (type === 'axial') {
- grad = ctx.createLinearGradient(p0[0], p0[1], p1[0], p1[1]);
- } else if (type === 'radial') {
- grad = ctx.createRadialGradient(p0[0], p0[1], r0, p1[0], p1[1], r1);
- }
-
- for (var i = 0, ii = colorStops.length; i < ii; ++i) {
- var c = colorStops[i];
- grad.addColorStop(c[0], c[1]);
- }
- return grad;
- }
- };
- }
-};
-
-var createMeshCanvas = (function createMeshCanvasClosure() {
- function drawTriangle(data, context, p1, p2, p3, c1, c2, c3) {
- // Very basic Gouraud-shaded triangle rasterization algorithm.
- var coords = context.coords, colors = context.colors;
- var bytes = data.data, rowSize = data.width * 4;
- var tmp;
- if (coords[p1 + 1] > coords[p2 + 1]) {
- tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
- }
- if (coords[p2 + 1] > coords[p3 + 1]) {
- tmp = p2; p2 = p3; p3 = tmp; tmp = c2; c2 = c3; c3 = tmp;
- }
- if (coords[p1 + 1] > coords[p2 + 1]) {
- tmp = p1; p1 = p2; p2 = tmp; tmp = c1; c1 = c2; c2 = tmp;
- }
- var x1 = (coords[p1] + context.offsetX) * context.scaleX;
- var y1 = (coords[p1 + 1] + context.offsetY) * context.scaleY;
- var x2 = (coords[p2] + context.offsetX) * context.scaleX;
- var y2 = (coords[p2 + 1] + context.offsetY) * context.scaleY;
- var x3 = (coords[p3] + context.offsetX) * context.scaleX;
- var y3 = (coords[p3 + 1] + context.offsetY) * context.scaleY;
- if (y1 >= y3) {
- return;
- }
- var c1r = colors[c1], c1g = colors[c1 + 1], c1b = colors[c1 + 2];
- var c2r = colors[c2], c2g = colors[c2 + 1], c2b = colors[c2 + 2];
- var c3r = colors[c3], c3g = colors[c3 + 1], c3b = colors[c3 + 2];
-
- var minY = Math.round(y1), maxY = Math.round(y3);
- var xa, car, cag, cab;
- var xb, cbr, cbg, cbb;
- var k;
- for (var y = minY; y <= maxY; y++) {
- if (y < y2) {
- k = y < y1 ? 0 : y1 === y2 ? 1 : (y1 - y) / (y1 - y2);
- xa = x1 - (x1 - x2) * k;
- car = c1r - (c1r - c2r) * k;
- cag = c1g - (c1g - c2g) * k;
- cab = c1b - (c1b - c2b) * k;
- } else {
- k = y > y3 ? 1 : y2 === y3 ? 0 : (y2 - y) / (y2 - y3);
- xa = x2 - (x2 - x3) * k;
- car = c2r - (c2r - c3r) * k;
- cag = c2g - (c2g - c3g) * k;
- cab = c2b - (c2b - c3b) * k;
- }
- k = y < y1 ? 0 : y > y3 ? 1 : (y1 - y) / (y1 - y3);
- xb = x1 - (x1 - x3) * k;
- cbr = c1r - (c1r - c3r) * k;
- cbg = c1g - (c1g - c3g) * k;
- cbb = c1b - (c1b - c3b) * k;
- var x1_ = Math.round(Math.min(xa, xb));
- var x2_ = Math.round(Math.max(xa, xb));
- var j = rowSize * y + x1_ * 4;
- for (var x = x1_; x <= x2_; x++) {
- k = (xa - x) / (xa - xb);
- k = k < 0 ? 0 : k > 1 ? 1 : k;
- bytes[j++] = (car - (car - cbr) * k) | 0;
- bytes[j++] = (cag - (cag - cbg) * k) | 0;
- bytes[j++] = (cab - (cab - cbb) * k) | 0;
- bytes[j++] = 255;
- }
- }
- }
-
- function drawFigure(data, figure, context) {
- var ps = figure.coords;
- var cs = figure.colors;
- var i, ii;
- switch (figure.type) {
- case 'lattice':
- var verticesPerRow = figure.verticesPerRow;
- var rows = Math.floor(ps.length / verticesPerRow) - 1;
- var cols = verticesPerRow - 1;
- for (i = 0; i < rows; i++) {
- var q = i * verticesPerRow;
- for (var j = 0; j < cols; j++, q++) {
- drawTriangle(data, context,
- ps[q], ps[q + 1], ps[q + verticesPerRow],
- cs[q], cs[q + 1], cs[q + verticesPerRow]);
- drawTriangle(data, context,
- ps[q + verticesPerRow + 1], ps[q + 1], ps[q + verticesPerRow],
- cs[q + verticesPerRow + 1], cs[q + 1], cs[q + verticesPerRow]);
- }
- }
- break;
- case 'triangles':
- for (i = 0, ii = ps.length; i < ii; i += 3) {
- drawTriangle(data, context,
- ps[i], ps[i + 1], ps[i + 2],
- cs[i], cs[i + 1], cs[i + 2]);
- }
- break;
- default:
- error('illigal figure');
- break;
- }
- }
-
- function createMeshCanvas(bounds, combinesScale, coords, colors, figures,
- backgroundColor) {
- // we will increase scale on some weird factor to let antialiasing take
- // care of "rough" edges
- var EXPECTED_SCALE = 1.1;
- // MAX_PATTERN_SIZE is used to avoid OOM situation.
- var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
-
- var offsetX = Math.floor(bounds[0]);
- var offsetY = Math.floor(bounds[1]);
- var boundsWidth = Math.ceil(bounds[2]) - offsetX;
- var boundsHeight = Math.ceil(bounds[3]) - offsetY;
-
- var width = Math.min(Math.ceil(Math.abs(boundsWidth * combinesScale[0] *
- EXPECTED_SCALE)), MAX_PATTERN_SIZE);
- var height = Math.min(Math.ceil(Math.abs(boundsHeight * combinesScale[1] *
- EXPECTED_SCALE)), MAX_PATTERN_SIZE);
- var scaleX = boundsWidth / width;
- var scaleY = boundsHeight / height;
-
- var context = {
- coords: coords,
- colors: colors,
- offsetX: -offsetX,
- offsetY: -offsetY,
- scaleX: 1 / scaleX,
- scaleY: 1 / scaleY
- };
-
- var canvas, tmpCanvas, i, ii;
- if (WebGLUtils.isEnabled) {
- canvas = WebGLUtils.drawFigures(width, height, backgroundColor,
- figures, context);
-
- // https://bugzilla.mozilla.org/show_bug.cgi?id=972126
- tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
- tmpCanvas.context.drawImage(canvas, 0, 0);
- canvas = tmpCanvas.canvas;
- } else {
- tmpCanvas = CachedCanvases.getCanvas('mesh', width, height, false);
- var tmpCtx = tmpCanvas.context;
-
- var data = tmpCtx.createImageData(width, height);
- if (backgroundColor) {
- var bytes = data.data;
- for (i = 0, ii = bytes.length; i < ii; i += 4) {
- bytes[i] = backgroundColor[0];
- bytes[i + 1] = backgroundColor[1];
- bytes[i + 2] = backgroundColor[2];
- bytes[i + 3] = 255;
- }
- }
- for (i = 0; i < figures.length; i++) {
- drawFigure(data, figures[i], context);
- }
- tmpCtx.putImageData(data, 0, 0);
- canvas = tmpCanvas.canvas;
- }
-
- return {canvas: canvas, offsetX: offsetX, offsetY: offsetY,
- scaleX: scaleX, scaleY: scaleY};
- }
- return createMeshCanvas;
-})();
-
-ShadingIRs.Mesh = {
- fromIR: function Mesh_fromIR(raw) {
- //var type = raw[1];
- var coords = raw[2];
- var colors = raw[3];
- var figures = raw[4];
- var bounds = raw[5];
- var matrix = raw[6];
- //var bbox = raw[7];
- var background = raw[8];
- return {
- type: 'Pattern',
- getPattern: function Mesh_getPattern(ctx, owner, shadingFill) {
- var scale;
- if (shadingFill) {
- scale = Util.singularValueDecompose2dScale(ctx.mozCurrentTransform);
- } else {
- // Obtain scale from matrix and current transformation matrix.
- scale = Util.singularValueDecompose2dScale(owner.baseTransform);
- if (matrix) {
- var matrixScale = Util.singularValueDecompose2dScale(matrix);
- scale = [scale[0] * matrixScale[0],
- scale[1] * matrixScale[1]];
- }
- }
-
-
- // Rasterizing on the main thread since sending/queue large canvases
- // might cause OOM.
- var temporaryPatternCanvas = createMeshCanvas(bounds, scale, coords,
- colors, figures, shadingFill ? null : background);
-
- if (!shadingFill) {
- ctx.setTransform.apply(ctx, owner.baseTransform);
- if (matrix) {
- ctx.transform.apply(ctx, matrix);
- }
- }
-
- ctx.translate(temporaryPatternCanvas.offsetX,
- temporaryPatternCanvas.offsetY);
- ctx.scale(temporaryPatternCanvas.scaleX,
- temporaryPatternCanvas.scaleY);
-
- return ctx.createPattern(temporaryPatternCanvas.canvas, 'no-repeat');
- }
- };
- }
-};
-
-ShadingIRs.Dummy = {
- fromIR: function Dummy_fromIR() {
- return {
- type: 'Pattern',
- getPattern: function Dummy_fromIR_getPattern() {
- return 'hotpink';
- }
- };
- }
-};
-
-function getShadingPatternFromIR(raw) {
- var shadingIR = ShadingIRs[raw[0]];
- if (!shadingIR) {
- error('Unknown IR type: ' + raw[0]);
- }
- return shadingIR.fromIR(raw);
-}
-
-var TilingPattern = (function TilingPatternClosure() {
- var PaintType = {
- COLORED: 1,
- UNCOLORED: 2
- };
-
- var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
-
- function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
- this.operatorList = IR[2];
- this.matrix = IR[3] || [1, 0, 0, 1, 0, 0];
- this.bbox = IR[4];
- this.xstep = IR[5];
- this.ystep = IR[6];
- this.paintType = IR[7];
- this.tilingType = IR[8];
- this.color = color;
- this.objs = objs;
- this.commonObjs = commonObjs;
- this.baseTransform = baseTransform;
- this.type = 'Pattern';
- this.ctx = ctx;
- }
-
- TilingPattern.prototype = {
- createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
- var operatorList = this.operatorList;
- var bbox = this.bbox;
- var xstep = this.xstep;
- var ystep = this.ystep;
- var paintType = this.paintType;
- var tilingType = this.tilingType;
- var color = this.color;
- var objs = this.objs;
- var commonObjs = this.commonObjs;
-
- info('TilingType: ' + tilingType);
-
- var x0 = bbox[0], y0 = bbox[1], x1 = bbox[2], y1 = bbox[3];
-
- var topLeft = [x0, y0];
- // we want the canvas to be as large as the step size
- var botRight = [x0 + xstep, y0 + ystep];
-
- var width = botRight[0] - topLeft[0];
- var height = botRight[1] - topLeft[1];
-
- // Obtain scale from matrix and current transformation matrix.
- var matrixScale = Util.singularValueDecompose2dScale(this.matrix);
- var curMatrixScale = Util.singularValueDecompose2dScale(
- this.baseTransform);
- var combinedScale = [matrixScale[0] * curMatrixScale[0],
- matrixScale[1] * curMatrixScale[1]];
-
- // MAX_PATTERN_SIZE is used to avoid OOM situation.
- // Use width and height values that are as close as possible to the end
- // result when the pattern is used. Too low value makes the pattern look
- // blurry. Too large value makes it look too crispy.
- width = Math.min(Math.ceil(Math.abs(width * combinedScale[0])),
- MAX_PATTERN_SIZE);
-
- height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
- MAX_PATTERN_SIZE);
-
- var tmpCanvas = CachedCanvases.getCanvas('pattern', width, height, true);
- var tmpCtx = tmpCanvas.context;
- var graphics = new CanvasGraphics(tmpCtx, commonObjs, objs);
- graphics.groupLevel = owner.groupLevel;
-
- this.setFillAndStrokeStyleToContext(tmpCtx, paintType, color);
-
- this.setScale(width, height, xstep, ystep);
- this.transformToScale(graphics);
-
- // transform coordinates to pattern space
- var tmpTranslate = [1, 0, 0, 1, -topLeft[0], -topLeft[1]];
- graphics.transform.apply(graphics, tmpTranslate);
-
- this.clipBbox(graphics, bbox, x0, y0, x1, y1);
-
- graphics.executeOperatorList(operatorList);
- return tmpCanvas.canvas;
- },
-
- setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
- this.scale = [width / xstep, height / ystep];
- },
-
- transformToScale: function TilingPattern_transformToScale(graphics) {
- var scale = this.scale;
- var tmpScale = [scale[0], 0, 0, scale[1], 0, 0];
- graphics.transform.apply(graphics, tmpScale);
- },
-
- scaleToContext: function TilingPattern_scaleToContext() {
- var scale = this.scale;
- this.ctx.scale(1 / scale[0], 1 / scale[1]);
- },
-
- clipBbox: function clipBbox(graphics, bbox, x0, y0, x1, y1) {
- if (bbox && isArray(bbox) && bbox.length === 4) {
- var bboxWidth = x1 - x0;
- var bboxHeight = y1 - y0;
- graphics.ctx.rect(x0, y0, bboxWidth, bboxHeight);
- graphics.clip();
- graphics.endPath();
- }
- },
-
- setFillAndStrokeStyleToContext:
- function setFillAndStrokeStyleToContext(context, paintType, color) {
- switch (paintType) {
- case PaintType.COLORED:
- var ctx = this.ctx;
- context.fillStyle = ctx.fillStyle;
- context.strokeStyle = ctx.strokeStyle;
- break;
- case PaintType.UNCOLORED:
- var cssColor = Util.makeCssRgb(color[0], color[1], color[2]);
- context.fillStyle = cssColor;
- context.strokeStyle = cssColor;
- break;
- default:
- error('Unsupported paint type: ' + paintType);
- }
- },
-
- getPattern: function TilingPattern_getPattern(ctx, owner) {
- var temporaryPatternCanvas = this.createPatternCanvas(owner);
-
- ctx = this.ctx;
- ctx.setTransform.apply(ctx, this.baseTransform);
- ctx.transform.apply(ctx, this.matrix);
- this.scaleToContext();
-
- return ctx.createPattern(temporaryPatternCanvas, 'repeat');
- }
- };
-
- return TilingPattern;
-})();