Implement a bicubic resampling image filter, with raster and GPU backends.
In order to get this to work on the GPU side, I had to modify the width and height of the drawn texture in drawSprite() and drawDevice() to use the filtered texture's dimensions, instead of the source texture. (This wasn't a problem before since all other image filters produce results the same dimensions as their input texture.)
For now, this implementation only does axis-aligned scaling (same as the Lanczos-3 implementation in Chrome). It's also done for correctness and clarity, not speed, so there are lots of opportunities for speedups.
Committed: https://code.google.com/p/skia/source/detail?r=7275
Review URL: https://codereview.appspot.com/7033049
git-svn-id: http://skia.googlecode.com/svn/trunk@7287 2bbb7eff-a529-9590-31e7-b0007b416f81
In order to get this to work on the GPU side, I had to modify the width and height of the drawn texture in drawSprite() and drawDevice() to use the filtered texture's dimensions, instead of the source texture. (This wasn't a problem before since all other image filters produce results the same dimensions as their input texture.)
For now, this implementation only does axis-aligned scaling (same as the Lanczos-3 implementation in Chrome). It's also done for correctness and clarity, not speed, so there are lots of opportunities for speedups.
Review URL: https://codereview.appspot.com/7033049
git-svn-id: http://skia.googlecode.com/svn/trunk@7275 2bbb7eff-a529-9590-31e7-b0007b416f81
Add a test and a GM for the factory, and a PNG file for it to decode.
The PNG file is copyright-free, obtained from
http://openclipart.org/detail/29213/paper-plane-by-ddoo
In cmykjpeg, do not attempt to decode in the constructor, since it
currently crashes on Mac (if you provide the correct resource path).
Even when we fix this crash there is no need to do it in the
constructor, since we create all of the gms in order to
get their names (to determine whether to run them).
Review URL: https://codereview.appspot.com/6847122
git-svn-id: http://skia.googlecode.com/svn/trunk@6618 2bbb7eff-a529-9590-31e7-b0007b416f81
is templated on the tiling mode for speed: interior pixels are unconditionally
fetched; border pixels apply the appropriate tiling mode before fetching. It
handles target, bias, divisor (as gain), and edge modes (named to be more
skia-like). It does not handle the "preserveAlpha" semantics of
feConvolveMatrix, nor "kernelUnitLength".
git-svn-id: http://skia.googlecode.com/svn/trunk@5592 2bbb7eff-a529-9590-31e7-b0007b416f81
allows the client more control over the scaling. Because of virtual overrides
and wanting to keep the old call-sites up and running, this CL renames the
virtual entry-point to drawBitmapRectToRect, and downgrades drawBitmapRect to
a non-virtual helper function.
The implementation is to use the float-rect for computing the matrix, but still
cons-up an integer rect for the purposes of subsetting the original bitmap. We
do this by calling float_src->roundOut(&int_src) so that we include all
(partially) covered src pixels.
No change needed on SkDevice, since that signature is explicitly passed the
computed matrix.
Review URL: https://codereview.appspot.com/6501140
git-svn-id: http://skia.googlecode.com/svn/trunk@5578 2bbb7eff-a529-9590-31e7-b0007b416f81
Notify the surface when the canvas draws into it, so it can invalidate the
cached image, and (if needed) perform a copy-on-write on the surface if it
was being shared with the image.
Review URL: https://codereview.appspot.com/6441115
git-svn-id: http://skia.googlecode.com/svn/trunk@5306 2bbb7eff-a529-9590-31e7-b0007b416f81
element. This filter has two inputs, since normal blending can't be used. The
GPU side uses two filter stages to accomplish this: one to sample the
background, and one to sample the foreground and blend it.
Review URL: https://codereview.appspot.com/6463081/
git-svn-id: http://skia.googlecode.com/svn/trunk@5231 2bbb7eff-a529-9590-31e7-b0007b416f81
for filters with a single image input. This provides functionality to store,
flatten and unflatten a single SkImageFilter input, as well as to recursively
evaluate it on the CPU or GPU. The following classes were re-parented to
implement DAG connectivity: SkBlurImageFilter, SkDilateImageFilter,
SkErodeImageFilter, SkColorFilterImageFilter. The constructors for each
have been appended with a new parameter, representing the input filter
(default NULL).
This change also implements an arbitrary SkBitmap input source for filtering,
SkBitmapSource.
NOTE: This CL will require gyp file changes when rolling past this revision.
Review URL: https://codereview.appspot.com/6462071/
git-svn-id: http://skia.googlecode.com/svn/trunk@5170 2bbb7eff-a529-9590-31e7-b0007b416f81
