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Merge pull request #3553 from yurydelendik/reduce-scratch-canvases

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Reduce max size for pattern and limit group canvases
This commit is contained in:
Yury Delendik 2013-08-30 18:02:15 -07:00
commit 8a4a6f498f
2 changed files with 43 additions and 38 deletions
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63
src/display/canvas.js
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@ -158,19 +158,24 @@ function addContextCurrentTransform(ctx) {
var CachedCanvases = (function CachedCanvasesClosure() {
var cache = {};
return {
getCanvas: function CachedCanvases_getCanvas(id, width, height) {
var canvas;
getCanvas: function CachedCanvases_getCanvas(id, width, height,
trackTransform) {
var canvasEntry;
if (id in cache) {
canvas = cache[id];
canvas.width = width;
canvas.height = height;
canvasEntry = cache[id];
canvasEntry.canvas.width = width;
canvasEntry.canvas.height = height;
// reset canvas transform for emulated mozCurrentTransform, if needed
canvas.getContext('2d').setTransform(1, 0, 0, 1, 0, 0);
canvasEntry.context.setTransform(1, 0, 0, 1, 0, 0);
} else {
canvas = createScratchCanvas(width, height);
cache[id] = canvas;
var canvas = createScratchCanvas(width, height);
var ctx = canvas.getContext('2d');
if (trackTransform) {
addContextCurrentTransform(ctx);
}
cache[id] = canvasEntry = {canvas: canvas, context: ctx};
}
return canvas;
return canvasEntry;
},
clear: function () {
cache = {};
@ -399,6 +404,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// spec 8.7.2 NOTE 1.
this.baseTransform = null;
this.baseTransformStack = [];
this.groupLevel = 0;
if (canvasCtx) {
addContextCurrentTransform(canvasCtx);
}
@ -745,7 +751,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// for patterns, we transform to pattern space, calculate
// the pattern, call stroke, and restore to user space
ctx.save();
ctx.strokeStyle = strokeColor.getPattern(ctx);
ctx.strokeStyle = strokeColor.getPattern(ctx, this);
ctx.stroke();
ctx.restore();
} else {
@ -769,7 +775,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
if (fillColor && fillColor.hasOwnProperty('type') &&
fillColor.type === 'Pattern') {
ctx.save();
ctx.fillStyle = fillColor.getPattern(ctx);
ctx.fillStyle = fillColor.getPattern(ctx, this);
needRestore = true;
}
@ -1393,7 +1399,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.save();
var pattern = Pattern.shadingFromIR(patternIR);
ctx.fillStyle = pattern.getPattern(ctx);
ctx.fillStyle = pattern.getPattern(ctx, this);
var inv = ctx.mozCurrentTransformInverse;
if (inv) {
@ -1505,9 +1511,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var drawnWidth = Math.max(Math.ceil(bounds[2] - bounds[0]), 1);
var drawnHeight = Math.max(Math.ceil(bounds[3] - bounds[1]), 1);
var scratchCanvas = createScratchCanvas(drawnWidth, drawnHeight);
var groupCtx = scratchCanvas.getContext('2d');
addContextCurrentTransform(groupCtx);
var scratchCanvas = CachedCanvases.getCanvas(
'groupAt' + this.groupLevel, drawnWidth, drawnHeight, true);
var groupCtx = scratchCanvas.context;
// Since we created a new canvas that is just the size of the bounding box
// we have to translate the group ctx.
var offsetX = bounds[0];
@ -1519,7 +1525,6 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// location.
currentCtx.setTransform(1, 0, 0, 1, 0, 0);
currentCtx.translate(offsetX, offsetY);
// The transparency group inherits all off the current graphics state
// except the blend mode, soft mask, and alpha constants.
copyCtxState(currentCtx, groupCtx);
@ -1531,9 +1536,11 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
['CA', 1]
]);
this.groupStack.push(currentCtx);
this.groupLevel++;
},
endGroup: function CanvasGraphics_endGroup(group) {
this.groupLevel--;
var groupCtx = this.ctx;
this.ctx = this.groupStack.pop();
// Turn off image smoothing to avoid sub pixel interpolation which can
@ -1626,7 +1633,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
var maskCtx = maskCanvas.getContext('2d');
var maskCtx = maskCanvas.context;
maskCtx.save();
putBinaryImageData(maskCtx, img);
@ -1636,12 +1643,12 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var fillColor = this.current.fillColor;
maskCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
fillColor.type === 'Pattern') ?
fillColor.getPattern(maskCtx) : fillColor;
fillColor.getPattern(maskCtx, this) : fillColor;
maskCtx.fillRect(0, 0, width, height);
maskCtx.restore();
this.paintInlineImageXObject(maskCanvas);
this.paintInlineImageXObject(maskCanvas.canvas);
},
paintImageMaskXObjectGroup:
@ -1653,7 +1660,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var width = image.width, height = image.height;
var maskCanvas = CachedCanvases.getCanvas('maskCanvas', width, height);
var maskCtx = maskCanvas.getContext('2d');
var maskCtx = maskCanvas.context;
maskCtx.save();
putBinaryImageData(maskCtx, image);
@ -1663,7 +1670,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var fillColor = this.current.fillColor;
maskCtx.fillStyle = (fillColor && fillColor.hasOwnProperty('type') &&
fillColor.type === 'Pattern') ?
fillColor.getPattern(maskCtx) : fillColor;
fillColor.getPattern(maskCtx, this) : fillColor;
maskCtx.fillRect(0, 0, width, height);
maskCtx.restore();
@ -1671,7 +1678,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.save();
ctx.transform.apply(ctx, image.transform);
ctx.scale(1, -1);
ctx.drawImage(maskCanvas, 0, 0, width, height,
ctx.drawImage(maskCanvas.canvas, 0, 0, width, height,
0, -1, 1, 1);
ctx.restore();
}
@ -1706,9 +1713,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
imgToPaint = imgData;
} else {
var tmpCanvas = CachedCanvases.getCanvas('inlineImage', width, height);
var tmpCtx = tmpCanvas.getContext('2d');
var tmpCtx = tmpCanvas.context;
putBinaryImageData(tmpCtx, imgData);
imgToPaint = tmpCanvas;
imgToPaint = tmpCanvas.canvas;
}
var paintWidth = width, paintHeight = height;
@ -1729,11 +1736,11 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
}
var tmpCanvas = CachedCanvases.getCanvas(tmpCanvasId,
newWidth, newHeight);
tmpCtx = tmpCanvas.getContext('2d');
tmpCtx = tmpCanvas.context;
tmpCtx.clearRect(0, 0, newWidth, newHeight);
tmpCtx.drawImage(imgToPaint, 0, 0, paintWidth, paintHeight,
0, 0, newWidth, newHeight);
imgToPaint = tmpCanvas;
imgToPaint = tmpCanvas.canvas;
paintWidth = newWidth;
paintHeight = newHeight;
tmpCanvasId = tmpCanvasId === 'prescale1' ? 'prescale2' : 'prescale1';
@ -1761,7 +1768,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
var h = imgData.height;
var tmpCanvas = CachedCanvases.getCanvas('inlineImage', w, h);
var tmpCtx = tmpCanvas.getContext('2d');
var tmpCtx = tmpCanvas.context;
putBinaryImageData(tmpCtx, imgData);
for (var i = 0, ii = map.length; i < ii; i++) {
@ -1769,7 +1776,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
ctx.save();
ctx.transform.apply(ctx, entry.transform);
ctx.scale(1, -1);
ctx.drawImage(tmpCanvas, entry.x, entry.y, entry.w, entry.h,
ctx.drawImage(tmpCanvas.canvas, entry.x, entry.y, entry.w, entry.h,
0, -1, 1, 1);
if (this.imageLayer) {
var position = this.getCanvasPosition(entry.x, entry.y);

18
src/shared/pattern.js
View File

@ -269,7 +269,7 @@ var TilingPattern = (function TilingPatternClosure() {
UNCOLORED: 2
};
var MAX_PATTERN_SIZE = 8192;
var MAX_PATTERN_SIZE = 3000; // 10in @ 300dpi shall be enough
function TilingPattern(IR, color, ctx, objs, commonObjs, baseTransform) {
this.name = IR[1][0].name;
@ -303,7 +303,7 @@ var TilingPattern = (function TilingPatternClosure() {
};
TilingPattern.prototype = {
createPatternCanvas: function TilinPattern_createPatternCanvas(tmpCanvas) {
createPatternCanvas: function TilinPattern_createPatternCanvas(owner) {
var operatorList = this.operatorList;
var bbox = this.bbox;
var xstep = this.xstep;
@ -343,12 +343,10 @@ var TilingPattern = (function TilingPatternClosure() {
height = Math.min(Math.ceil(Math.abs(height * combinedScale[1])),
MAX_PATTERN_SIZE);
tmpCanvas.width = width;
tmpCanvas.height = height;
// set the new canvas element context as the graphics context
var tmpCtx = tmpCanvas.getContext('2d');
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);
@ -362,6 +360,7 @@ var TilingPattern = (function TilingPatternClosure() {
this.clipBbox(graphics, bbox, x0, y0, x1, y1);
graphics.executeOperatorList(operatorList);
return tmpCanvas.canvas;
},
setScale: function TilingPattern_setScale(width, height, xstep, ystep) {
@ -408,9 +407,8 @@ var TilingPattern = (function TilingPatternClosure() {
}
},
getPattern: function TilingPattern_getPattern() {
var temporaryPatternCanvas = CachedCanvases.getCanvas('pattern');
this.createPatternCanvas(temporaryPatternCanvas);
getPattern: function TilingPattern_getPattern(ctx, owner) {
var temporaryPatternCanvas = this.createPatternCanvas(owner);
var ctx = this.ctx;
ctx.setTransform.apply(ctx, this.baseTransform);