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refactored background rendering

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This commit is contained in:
Niklas von Hertzen 2012-12-30 15:38:17 +02:00
parent 74e93cbb93
commit 1357057cbf
1 changed files with 46 additions and 43 deletions
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89
src/Parse.js
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@ -687,44 +687,44 @@ _html2canvas.Parse = function (images, options) {
}
}
function renderBackgroundNoRepeat(ctx, image, backgroundPosition, bounds) {
var bgw = bounds.width - backgroundPosition.left,
bgh = bounds.height - backgroundPosition.top,
function renderBackgroundNoRepeat(ctx, image, backgroundPosition, x, y, w, h) {
var bgdw = w - backgroundPosition.left,
bgdh = h - backgroundPosition.top,
bgsx = backgroundPosition.left,
bgsy = backgroundPosition.top,
bgdx = backgroundPosition.left + bounds.left,
bgdy = backgroundPosition.top + bounds.top;
bgdx = backgroundPosition.left + x,
bgdy = backgroundPosition.top + y;
if (bgsx<0){
bgsx = Math.abs(bgsx);
bgdx += bgsx;
bgw = Math.min(bounds.width,image.width-bgsx);
bgdw = Math.min(w,image.width-bgsx);
} else {
bgw = Math.min(bgw,image.width);
bgdw = Math.min(bgdw,image.width);
bgsx = 0;
}
if (bgsy < 0){
bgsy = Math.abs(bgsy);
bgdy += bgsy;
bgh = Math.min(bounds.height, image.height - bgsy);
}else{
bgh = Math.min(bgh, image.height);
bgdh = Math.min(h, image.height - bgsy);
} else {
bgdh = Math.min(bgdh, image.height);
bgsy = 0;
}
if (bgh>0 && bgw > 0){
if (bgdh > 0 && bgdw > 0){
drawImage(
ctx,
image,
bgsx, // source X : 0
bgsy, // source Y : 1695
bgw, // source Width : 18
bgh, // source Height : 1677
bgdx, // destination X :906
bgdy, // destination Y : 1020
bgw, // destination width : 18
bgh // destination height : 1677
bgsx,
bgsy,
bgdw,
bgdh,
bgdx,
bgdy,
bgdw,
bgdh
);
}
}
@ -766,12 +766,32 @@ _html2canvas.Parse = function (images, options) {
);
}
function renderBackground(el, bounds, ctx) {
function renderBackgroundRepeating(el, bounds, ctx, image) {
var backgroundPosition = _html2canvas.Util.BackgroundPosition(el, bounds, image),
backgroundRepeat = getCSS(el, "backgroundRepeat").split(",")[0];
switch (backgroundRepeat) {
case "repeat-x":
renderBackgroundRepeatX(ctx, image, backgroundPosition, bounds.left, bounds.top, bounds.width, bounds.height);
break;
case "repeat-y":
renderBackgroundRepeatY(ctx, image, backgroundPosition, bounds.left, bounds.top, bounds.width, bounds.height);
break;
case "no-repeat":
renderBackgroundNoRepeat(ctx, image, backgroundPosition, bounds.left, bounds.top, bounds.width, bounds.height);
break;
default:
renderBackgroundRepeat(ctx, image, backgroundPosition, bounds);
break;
}
}
function renderBackgroundImage(element, bounds, ctx) {
// TODO add support for multi background-images
var backgroundImage = getCSS(el, "backgroundImage"),
background_repeat = getCSS(el, "backgroundRepeat").split(",")[0],
image,
bgp;
var backgroundImage = getCSS(element, "backgroundImage"),
image;
if (!/data:image\/.*;base64,/i.test(backgroundImage) && !/^(-webkit|-moz|linear-gradient|-o-)/.test(backgroundImage)) {
backgroundImage = backgroundImage.split(",")[0];
@ -782,24 +802,7 @@ _html2canvas.Parse = function (images, options) {
// TODO add support for background-origin
if (image) {
bgp = _html2canvas.Util.BackgroundPosition(el, bounds, image);
switch (background_repeat) {
case "repeat-x":
renderBackgroundRepeatX(ctx, image, bgp, bounds.left, bounds.top, bounds.width, bounds.height);
break;
case "repeat-y":
renderBackgroundRepeatY(ctx, image, bgp, bounds.left, bounds.top, bounds.width, bounds.height);
break;
case "no-repeat":
renderBackgroundNoRepeat(ctx, image, bgp, bounds);
break;
default:
renderBackgroundRepeat(ctx, image, bgp, bounds);
break;
}
renderBackgroundRepeating(element, bounds, ctx, image);
} else {
h2clog("html2canvas: Error loading background:" + backgroundImage);
}
@ -861,7 +864,7 @@ _html2canvas.Parse = function (images, options) {
if (backgroundBounds.height > 0 && backgroundBounds.width > 0){
renderBackgroundColor(ctx, backgroundBounds, bgcolor);
renderBackground(element, backgroundBounds, ctx);
renderBackgroundImage(element, backgroundBounds, ctx);
}
switch(element.nodeName){