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Implement perspective for bitmaps in pdf.

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R=vandebo@chromium.org

Review URL: https://codereview.chromium.org/27236007

git-svn-id: http://skia.googlecode.com/svn/trunk@11822 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
edisonn@google.com 2013-10-16 18:32:35 +00:00
parent 846872f75b
commit 9cf0cb169b
1 changed files with 84 additions and 7 deletions
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91
src/pdf/SkPDFDevice.cpp
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@ -2028,23 +2028,100 @@ int SkPDFDevice::getFontResourceIndex(SkTypeface* typeface, uint16_t glyphID) {
return resourceIndex;
}
void SkPDFDevice::internalDrawBitmap(const SkMatrix& matrix,
void SkPDFDevice::internalDrawBitmap(const SkMatrix& origMatrix,
const SkClipStack* clipStack,
const SkRegion& clipRegion,
const SkBitmap& bitmap,
const SkRegion& origClipRegion,
const SkBitmap& origBitmap,
const SkIRect* srcRect,
const SkPaint& paint) {
// TODO(edisonn): Perspective matrix support implemented here
SkMatrix matrix = origMatrix;
SkRegion perspectiveBounds;
const SkRegion* clipRegion = &origClipRegion;
SkBitmap perspectiveBitmap;
const SkBitmap* bitmap = &origBitmap;
SkBitmap tmpSubsetBitmap;
// Rasterize the bitmap using perspective in a new bitmap.
if (origMatrix.hasPerspective()) {
SkBitmap* subsetBitmap;
if (srcRect) {
if (!origBitmap.extractSubset(&tmpSubsetBitmap, *srcRect)) {
return;
}
subsetBitmap = &tmpSubsetBitmap;
} else {
subsetBitmap = &tmpSubsetBitmap;
*subsetBitmap = origBitmap;
}
srcRect = NULL;
// Transform the bitmap in the new space.
SkPath perspectiveOutline;
perspectiveOutline.addRect(
SkRect::MakeWH(SkIntToScalar(subsetBitmap->width()),
SkIntToScalar(subsetBitmap->height())));
perspectiveOutline.transform(origMatrix);
// TODO(edisonn): perf - use current clip too.
// Retrieve the bounds of the new shape.
SkRect bounds = perspectiveOutline.getBounds();
// TODO(edisonn): add DPI settings. Currently 1 pixel/point, which does
// not look great, but it is not producing large PDFs.
// TODO(edisonn): A better approach would be to use a bitmap shader
// (in clamp mode) and draw a rect over the entire bounding box. Then
// intersect perspectiveOutline to the clip. That will avoid introducing
// alpha to the image while still giving good behavior at the edge of
// the image. Avoiding alpha will reduce the pdf size and generation
// CPU time some.
perspectiveBitmap.setConfig(SkBitmap::kARGB_8888_Config,
SkScalarCeilToInt(bounds.width()),
SkScalarCeilToInt(bounds.height()));
perspectiveBitmap.allocPixels();
perspectiveBitmap.eraseColor(SK_ColorTRANSPARENT);
SkBitmapDevice device(perspectiveBitmap);
SkCanvas canvas(&device);
SkScalar deltaX = bounds.left();
SkScalar deltaY = bounds.top();
SkMatrix offsetMatrix = origMatrix;
offsetMatrix.postTranslate(-deltaX, -deltaY);
// Translate the draw in the new canvas, so we perfectly fit the
// shape in the bitmap.
canvas.setMatrix(offsetMatrix);
canvas.drawBitmap(*subsetBitmap, SkIntToScalar(0), SkIntToScalar(0));
// Make sure the final bits are in the bitmap.
canvas.flush();
// In the new space, we use the identity matrix translated.
matrix.setTranslate(deltaX, deltaY);
perspectiveBounds.setRect(
SkIRect::MakeXYWH(SkScalarFloorToInt(bounds.x()),
SkScalarFloorToInt(bounds.y()),
SkScalarCeilToInt(bounds.width()),
SkScalarCeilToInt(bounds.height())));
clipRegion = &perspectiveBounds;
srcRect = NULL;
bitmap = &perspectiveBitmap;
}
SkMatrix scaled;
// Adjust for origin flip.
scaled.setScale(SK_Scalar1, -SK_Scalar1);
scaled.postTranslate(0, SK_Scalar1);
// Scale the image up from 1x1 to WxH.
SkIRect subset = SkIRect::MakeWH(bitmap.width(), bitmap.height());
SkIRect subset = SkIRect::MakeWH(bitmap->width(), bitmap->height());
scaled.postScale(SkIntToScalar(subset.width()),
SkIntToScalar(subset.height()));
scaled.postConcat(matrix);
ScopedContentEntry content(this, clipStack, clipRegion, scaled, paint);
ScopedContentEntry content(this, clipStack, *clipRegion, scaled, paint);
if (!content.entry()) {
return;
}
@ -2053,7 +2130,7 @@ void SkPDFDevice::internalDrawBitmap(const SkMatrix& matrix,
return;
}
SkPDFImage* image = SkPDFImage::CreateImage(bitmap, subset, fEncoder);
SkPDFImage* image = SkPDFImage::CreateImage(*bitmap, subset, fEncoder);
if (!image) {
return;
}