Sakurai/pdf.js
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Set max size for the group

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This commit is contained in:
Yury Delendik 2014-02-13 07:01:45 -06:00
parent 3e17021f8d
commit 5262e6f84f
1 changed files with 22 additions and 6 deletions
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28
src/display/canvas.js
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@ -26,6 +26,7 @@
// Minimal font size that would be used during canvas fillText operations.
var MIN_FONT_SIZE = 16;
var MAX_GROUP_SIZE = 4096;
var COMPILE_TYPE3_GLYPHS = true;
@ -663,8 +664,9 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
maskCtx.putImageData(layerData, 0, row);
}
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.drawImage(mask, smask.offsetX, smask.offsetY);
ctx.setTransform(smask.scaleX, 0, 0, smask.scaleY,
smask.offsetX, smask.offsetY);
ctx.drawImage(mask, 0, 0);
}
var LINE_CAP_STYLES = ['butt', 'round', 'square'];
@ -904,6 +906,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
this.ctx.save();
var groupCtx = scratchCanvas.context;
groupCtx.scale(1 / activeSMask.scaleX, 1 / activeSMask.scaleY);
groupCtx.translate(-activeSMask.offsetX, -activeSMask.offsetY);
groupCtx.transform.apply(groupCtx, currentTransform);
@ -1792,8 +1795,19 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
bounds = Util.intersect(bounds, canvasBounds) || [0, 0, 0, 0];
// Use ceil in case we're between sizes so we don't create canvas that is
// too small and make the canvas at least 1x1 pixels.
var drawnWidth = Math.max(Math.ceil(bounds[2] - bounds[0]), 1);
var drawnHeight = Math.max(Math.ceil(bounds[3] - bounds[1]), 1);
var offsetX = Math.floor(bounds[0]);
var offsetY = Math.floor(bounds[1]);
var drawnWidth = Math.max(Math.ceil(bounds[2]) - offsetX, 1);
var drawnHeight = Math.max(Math.ceil(bounds[3]) - offsetY, 1);
var scaleX = 1, scaleY = 1;
if (drawnWidth > MAX_GROUP_SIZE) {
scaleX = drawnWidth / MAX_GROUP_SIZE;
drawnWidth = MAX_GROUP_SIZE;
}
if (drawnHeight > MAX_GROUP_SIZE) {
scaleY = drawnHeight / MAX_GROUP_SIZE;
drawnHeight = MAX_GROUP_SIZE;
}
var cacheId = 'groupAt' + this.groupLevel;
if (group.smask) {
@ -1806,8 +1820,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// 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];
var offsetY = bounds[1];
groupCtx.scale(1 / scaleX, 1 / scaleY);
groupCtx.translate(-offsetX, -offsetY);
groupCtx.transform.apply(groupCtx, currentTransform);
@ -1818,6 +1831,8 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
context: groupCtx,
offsetX: offsetX,
offsetY: offsetY,
scaleX: scaleX,
scaleY: scaleY,
subtype: group.smask.subtype,
backdrop: group.smask.backdrop,
colorSpace: group.colorSpace && ColorSpace.fromIR(group.colorSpace)
@ -1827,6 +1842,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
// right location.
currentCtx.setTransform(1, 0, 0, 1, 0, 0);
currentCtx.translate(offsetX, offsetY);
currentCtx.scale(scaleX, scaleY);
}
// The transparency group inherits all off the current graphics state
// except the blend mode, soft mask, and alpha constants.