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Use RGB_24BPP form for all images lacking alpha data.

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Nicholas Nethercote 2014-03-03 20:46:42 -08:00
parent ba95e0b07b
commit a2fe30ff38
2 changed files with 44 additions and 29 deletions
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36
src/core/image.js
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@ -383,7 +383,7 @@ var PDFImage = (function PDFImageClosure() {
rgbaBuf[j] = alphaBuf[i];
}
} else {
// Common case: no mask (and no need to allocate the extra buffer).
// No mask.
for (var i = 0, j = 3, ii = width * actualHeight; i < ii; ++i, j += 4) {
rgbaBuf[j] = 255;
}
@ -467,23 +467,35 @@ var PDFImage = (function PDFImageClosure() {
var comps = this.getComponents(imgArray);
var rgbaBuf = new Uint8Array(drawWidth * drawHeight * 4);
// If opacity data is present, use RGBA_32BPP form. Otherwise, use the
// more compact RGB_24BPP form if allowable.
var alpha01, maybeUndoPreblend;
if (!forceRGBA && !this.smask && !this.mask) {
imgData.kind = ImageKind.RGB_24BPP;
imgData.data = new Uint8Array(drawWidth * drawHeight * 3);
alpha01 = 0;
maybeUndoPreblend = false;
} else {
imgData.kind = ImageKind.RGBA_32BPP;
imgData.data = new Uint8Array(drawWidth * drawHeight * 4);
alpha01 = 1;
maybeUndoPreblend = true;
// Handle opacity here since color key masking needs to be performed on
// undecoded values.
this.fillOpacity(rgbaBuf, drawWidth, drawHeight, actualHeight, comps);
// Color key masking (opacity) must be performed before decoding.
this.fillOpacity(imgData.data, drawWidth, drawHeight, actualHeight,
comps);
}
if (this.needsDecode) {
this.decodeBuffer(comps);
}
this.colorSpace.fillRgb(imgData.data, originalWidth, originalHeight,
drawWidth, drawHeight, actualHeight, bpc, comps,
alpha01);
if (maybeUndoPreblend) {
this.undoPreblend(imgData.data, drawWidth, actualHeight);
}
this.colorSpace.fillRgb(rgbaBuf, originalWidth, originalHeight, drawWidth,
drawHeight, actualHeight, bpc, comps);
this.undoPreblend(rgbaBuf, drawWidth, actualHeight);
imgData.kind = ImageKind.RGBA_32BPP;
imgData.data = rgbaBuf;
return imgData;
},
fillGrayBuffer: function PDFImage_fillGrayBuffer(buffer) {