In some cases, the allocated array into which the data will be read is using getArrayCount() to allocate itself, which should be safe, but some cases use fixed length arrays or compute the array size before reading, which could overflow if the stream is compromised.
To prevent that from happening, I added a check that will verify that the number of bytes to read will not exceed the capacity of the input buffer argument passed to all the read...Array() functions.
I chose to use the byte array for this initial version, so that "size" represents the same value across all read...Array() functions, but I could also use the element count, if it is preferred.
Note : readPointArray and writePointArray are unused, so I could also remove them
BUG=
R=reed@google.com, mtklein@google.com, senorblanco@chromium.org
Author: sugoi@chromium.org
Review URL: https://codereview.chromium.org/37803002
git-svn-id: http://skia.googlecode.com/svn/trunk@12058 2bbb7eff-a529-9590-31e7-b0007b416f81
- SkScaledImageCache:
- Add new FindAndLock/AddAndLock variants that work well with
SkLazyPixelRefs (take width, height, generation_id).
- Add static versions of these new variants.
- SkLazyPixelRef:
- If NULL passed in as SkImageCache* in the constructor, it will
now default to using the static SkScaledImageCache methods to
cache decoded images.
- If (fImageCache==NULL), the default allocator can be changed
with the setAllocator method. If (fImageCache!=NULL), the
SkImageCache handles allocation.
- CachedDecodingPixelRefTest to test the new functionality.
BUG=
R=scroggo@google.com, mtklein@google.com, reed@google.com
Author: halcanary@google.com
Review URL: https://codereview.chromium.org/37343002
git-svn-id: http://skia.googlecode.com/svn/trunk@12006 2bbb7eff-a529-9590-31e7-b0007b416f81
This adds an invalidation listener mechanism to SkPixelRef to let it send this message while still staying ignorant of who's listening.
These messages are tricky to deliver. The SkPixelRefs they originates from and the GrResourceCaches they ultimately end up at may be on different threads; neither class is threadsafe; their object lifetimes are totally independent; it's a many-senders-to-many-receivers relation; and neither codebase should really know about the other.
So I've added a per-message-type global message bus to broadcast messages to threadsafe inboxes. Anyone can post() a message, which will show up in all the inboxes of that type, read whenever the inbox's owner calls poll(). The implementation is _dumb_; it can be improved in several dimensions (inbox size limits, lock-free message delivery) if we find the need.
I took some care to make sure not to send the invalidation message for any SkPixelRef that's sharing a generation ID with another SkPixelRef.
BUG=
R=bsalomon@google.com, scroggo@google.com, reed@google.com
Author: mtklein@google.com
Review URL: https://codereview.chromium.org/26734003
git-svn-id: http://skia.googlecode.com/svn/trunk@11949 2bbb7eff-a529-9590-31e7-b0007b416f81
Adds GrEffect::willUseInputColor() which indicates whether or not the
input color affects the output of the effect. This is needed for
certain Xfermodes, such as kSrc_Mode. For these modes the color filter
will not use the input color.
An effect with GrEffect::willUseInputColor() true will cause all color
or coverage effects before it to be discarded, as their computations
cannot affect the output. In these cases program is marked as having
white input color.
This fixes an assert when Skia is compiled in a mode that prefers
using uniforms instead of attributes for constants. (Flags
GR_GL_USE_NV_PATH_RENDERING or GR_GL_NO_CONSTANT_ATTRIBUTES). Using
attributes hides the problem where the fragment shader does not need
input color for color filters that ignore DST part of the filter. The
assert would be hit when uniform manager tries to bind an uniform which
has been optimized away by the shader compiler.
Adds specific GrGLSLExpr4 and GrGLSLExpr1 classes. This way the GLSL
expressions like "(v - src.a)" can remain somewhat readable in form of
"(v - src.a())". The GrGLSLExpr<typename> template implements the
generic functionality, GrGLSLExprX is the specialization that exposes
the type-safe interface to this functionality.
Also adds operators so that GLSL binary operators of the form
"(float * vecX)" can be expressed in C++. Before only the equivalent
"(vecX * float)" was possible. This reverts the common blending
calculations to more conventional order, such as "(1-a) * c" instead of
"c * (1-a)".
Changes GrGLSLExpr1::OnesStr from 1 to 1.0 in order to preserve the
color filter blending formula string the same (with the exception of
variable name change).
Shaders change in case of input color being needed:
- vec4 filteredColor;
- filteredColor = (((1.0 - uFilterColor.a) * output_Stage0) + uFilterColor);
- fsColorOut = filteredColor;
+ vec4 output_Stage1;
+ { // Stage 1: ModeColorFilterEffect
+ output_Stage1 = (((1.0 - uFilterColor_Stage1.a) * output_Stage0) + uFilterColor_Stage1);
+ }
+ fsColorOut = output_Stage1;
Shaders change in case of input color being not needed:
-uniform vec4 uFilterColor;
-in vec4 vColor;
+uniform vec4 uFilterColor_Stage0;
out vec4 fsColorOut;
void main() {
- vec4 filteredColor;
- filteredColor = uFilterColor;
- fsColorOut = filteredColor;
+ vec4 output_Stage0;
+ { // Stage 0: ModeColorFilterEffect
+ output_Stage0 = uFilterColor_Stage0;
+ }
+ fsColorOut = output_Stage0;
}
R=bsalomon@google.com, robertphillips@google.com, jvanverth@google.com
Author: kkinnunen@nvidia.com
Review URL: https://codereview.chromium.org/25023003
git-svn-id: http://skia.googlecode.com/svn/trunk@11912 2bbb7eff-a529-9590-31e7-b0007b416f81
Add new runtime configuration variable,
images.gif.suppressDecoderWarnings, which suppresses warning and
errors from the GIF library. It defaults to "true", which is current
behavior.
(This setting can be changed by setting the environment variable
skia_images_gif_suppressDecoderWarnings="false".)
Some conditions which were errors before are now warnings:
- If the image width or height is greater than the GIF screen width or
height (respectively) we expand the screen to hold the image.
- If the offset of the image inside the screen would place the
image outside of the screen, we shift the image to fix this.
- If the image lacks a color table, we create a default color table.
- If the image is truncated, then the rest of the image is filled with
the fill color.
In all four cases, if images.gif.suppressDecoderWarnings is set to
false, then a warning message is printed via SkDebugf.
In the event of another kind of error, SkGIFImageDecoder::onDecode()
will still return false. But with this change, if
images.gif.suppressDecoderWarnings is set to false, a description of
the error is printed via SkDebugf.
Also, added a new unit test GifTest, which tests the deconing of both
good GIf files and corrupted files that should now work with this
change. This unit test is disabled on Win32, iOS, and Mac.
BUG=skia:1689
R=scroggo@google.com
Review URL: https://codereview.chromium.org/26743002
git-svn-id: http://skia.googlecode.com/svn/trunk@11734 2bbb7eff-a529-9590-31e7-b0007b416f81
This change address what happens when a jpeg is partially downloaded
before failing. Many browsers will render it anyway: we want Skia to
do the same. The JpegTest takes a perfectly cromulent jpeg file and
only passes into the ImageDecoder the first half of the image. We
then verify that the image decoder returns a valid bitmap of the
correct dimensions.
We also fixed some png library errors, including issue 1691.
Also, suppressed the majority of warnings from using libpng and
libjpeg. By default, most warnings are *not* suppressed in debug mode.
If you have a debug binary and wish to suppress warnings, set the
following environment variables to true
skia_images_png_suppressDecoderWarnings
skia_images_jpeg_suppressDecoderWarnings
or from within a program that links to Skia:
#if defined(SK_DEBUG)
#include "SkRTConf.h"
SK_CONF_SET("images.jpeg.suppressDecoderWarnings", true);
SK_CONF_SET("images.png.suppressDecoderWarnings", true);
#endif
I tested this, before (control) and after these changes (test), on
364,295 skps from the cluster telemetry.
- number of errors+warnings in control = 2804
- number of errors+warnings fixed = 2283
- number of PNG verbosity fixed = 2152
- number of PNG error fixed = 4
- number of PNG segfault fixed = 3
- number of PNG errors changed to warnings = 62
- number of JPG verbosity fixed = 26
- number of JPG error fixed = 91
Not all errors and warning have been fixed.
These numbers were generated using the find_bad_images_in_skps.py
program. This program may be useful going forward for testing
image-decoding libraries on skp files from the cluster telemetry.
find_bad_images_in_skps.py depends on the test_image_decoder program,
which simply executes the SkImageDecoder::DecodeFile function and uses
its exit status to report success or failure.
BUG=skia:1649
BUG=skia:1691
BUG=skia:1680
R=scroggo@google.com
Review URL: https://codereview.chromium.org/24449003
git-svn-id: http://skia.googlecode.com/svn/trunk@11597 2bbb7eff-a529-9590-31e7-b0007b416f81
I'm seeing basically no difference between malloc + bzero and calloc on my desktop, but on a Galaxy Nexus calloc is never slower, and significantly faster once the allocation size becomes large, both for allocation and for _reading_.
BUG=skia:1662
R=reed@google.com
Review URL: https://codereview.chromium.org/24251008
git-svn-id: http://skia.googlecode.com/svn/trunk@11414 2bbb7eff-a529-9590-31e7-b0007b416f81
In order to preserve the immutability of SkImageFilters, the crop rect is passed as a constructor parameter. If NULL (the default), the bounds of the input image are used, as before.
This also tightens up the boundary handling for SkImageBlurFilter on the GPU backend. Where we were previously using clamping semantics, we now respect decal semantics (so we don't oversaturate the edges). This brings the GPU and raster backends into closer alignment, but will require some new baselines for the GPU tests.
At a minimum, the following tests will need new baselines: imageblur, imagefiltersbase, imagefilterscropped, spritebitmap.
R=reed@google.com
Committed: https://code.google.com/p/skia/source/detail?r=10251
Review URL: https://codereview.chromium.org/19775006
git-svn-id: http://skia.googlecode.com/svn/trunk@10338 2bbb7eff-a529-9590-31e7-b0007b416f81
Currently they cannot be used directly by Skia, but
the pixels can be used elsewhere.
SkImageDecoder:
Add functions to require unpremultiplied output
and query the presence of the requirement
SkImageDecoder_libpng:
SkImageDecoder_libwebp:
SkImageDecoder_WIC:
Respect the requirement for unpremultiplied output.
TODO: Fix SkImageDecoder_CG.
SkScaledBitmapSampler:
Add procs to skip premultiplication and a boolean
parameter to use those procs.
ImageDecodingTest:
Test unpremultiplied bitmap decoding.
SampleUnpremul:
Add a sample which allows visually comparing between the
unpremultiplied version (copied into a premultiplied bitmap,
since drawing unpremultiplied is not currently supported)
and a premultiplied version of image files.
gm.h:
Add a getter for the resource path, so Samples can use it.
As of patch set 13, https://codereview.chromium.org/16816016/
and https://codereview.chromium.org/16983004/, which were
approved separately.
R=reed@google.com
Review URL: https://codereview.chromium.org/16410009
git-svn-id: http://skia.googlecode.com/svn/trunk@9612 2bbb7eff-a529-9590-31e7-b0007b416f81
SkOSFile:
Added class SkOSPath with functions for
modifying strings representing path names.
OSPathTest.cpp:
Test of the new utilities.
factory.cpp:
Use SkPathJoin.
gmmain and gm_expectations:
Use SkOSPath::SkPathJoin instead of a local version.
skimage_main.cpp:
Use the new location of SkPathJoin and SkBasename.
R=epoger@google.com
Review URL: https://codereview.chromium.org/15747004
git-svn-id: http://skia.googlecode.com/svn/trunk@9277 2bbb7eff-a529-9590-31e7-b0007b416f81
Add an option to SkCanvas to turn on path
ops when combining clips.
Allow Op() to use one of the input paths
as an output path.
Fix a bug in Op() when the minuend is empty
and the subtrahend is not (for difference).
Change the build to allow core to depend on pathops.
Review URL: https://codereview.chromium.org/14474002
git-svn-id: http://skia.googlecode.com/svn/trunk@8855 2bbb7eff-a529-9590-31e7-b0007b416f81
This temporarily disables SK_ENABLE_INST_COUNT
( skbug.com/1219 )
This fixes a linktime error on VS2012 in
PathTest.cpp; -SK_ScalarInfinity should be
SK_ScalarNegativeInfinity instead.
This adds pathops and pathops unit tests to the
main unit tests.
Should this change destabilize anything, it should
be sufficient to comment out the pathops gypi
includes. at test.gyp:18,21.
Review URL: https://codereview.chromium.org/14137010
git-svn-id: http://skia.googlecode.com/svn/trunk@8644 2bbb7eff-a529-9590-31e7-b0007b416f81
