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CLOSED TREE Backed out changeset 652c909b75ad (bug 1290293) Backed out changeset 90a284ea19e3 (bug 1290292) Backed out changeset 8401d12fe936 (bug 1290293) Backed out changeset d87488b69c18 (bug 1290293) Backed out changeset 7368aa665fae (bug 1290293)
381 lines
12 KiB
C++
381 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* DownscalingSurfaceFilter is a SurfaceFilter implementation for use with
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* SurfacePipe which performs Lanczos downscaling.
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*
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* It's in this header file, separated from the other SurfaceFilters, because
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* some preprocessor magic is necessary to ensure that there aren't compilation
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* issues on platforms where Skia is unavailable.
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*/
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#ifndef mozilla_image_DownscalingFilter_h
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#define mozilla_image_DownscalingFilter_h
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#include <algorithm>
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#include <ctime>
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#include <stdint.h>
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#include "mozilla/Maybe.h"
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#include "mozilla/SSE.h"
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#include "mozilla/mips.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/gfx/2D.h"
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#include "gfxPrefs.h"
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#ifdef MOZ_ENABLE_SKIA
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#include "convolver.h"
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#include "image_operations.h"
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#include "skia/include/core/SkTypes.h"
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#endif
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#include "SurfacePipe.h"
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namespace mozilla {
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namespace image {
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//////////////////////////////////////////////////////////////////////////////
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// DownscalingFilter
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//////////////////////////////////////////////////////////////////////////////
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template <typename Next> class DownscalingFilter;
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/**
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* A configuration struct for DownscalingConfig.
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*/
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struct DownscalingConfig
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{
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template <typename Next> using Filter = DownscalingFilter<Next>;
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gfx::IntSize mInputSize; /// The size of the input image. We'll downscale
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/// from this size to the input size of the next
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/// SurfaceFilter in the chain.
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gfx::SurfaceFormat mFormat; /// The pixel format - BGRA or BGRX. (BGRX has
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/// slightly better performance.)
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};
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#ifndef MOZ_ENABLE_SKIA
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/**
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* DownscalingFilter requires Skia. This is a fallback implementation for
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* non-Skia builds that fails when Configure() is called (which will prevent
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* SurfacePipeFactory from returning an instance of it) and crashes if a caller
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* manually constructs an instance and attempts to actually use it. Callers
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* should avoid this by ensuring that they do not request downscaling in
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* non-Skia builds.
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*/
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template <typename Next>
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class DownscalingFilter final : public SurfaceFilter
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{
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public:
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Maybe<SurfaceInvalidRect> TakeInvalidRect() override { return Nothing(); }
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template <typename... Rest>
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nsresult Configure(const DownscalingConfig& aConfig, Rest... aRest)
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{
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return NS_ERROR_FAILURE;
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}
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protected:
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uint8_t* DoResetToFirstRow() override { MOZ_CRASH(); return nullptr; }
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uint8_t* DoAdvanceRow() override { MOZ_CRASH(); return nullptr; }
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};
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#else
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/**
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* DownscalingFilter performs Lanczos downscaling, taking image input data at one size
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* and outputting it rescaled to a different size.
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*
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* The 'Next' template parameter specifies the next filter in the chain.
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*/
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template <typename Next>
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class DownscalingFilter final : public SurfaceFilter
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{
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public:
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DownscalingFilter()
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: mXFilter(MakeUnique<skia::ConvolutionFilter1D>())
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, mYFilter(MakeUnique<skia::ConvolutionFilter1D>())
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, mWindowCapacity(0)
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, mRowsInWindow(0)
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, mInputRow(0)
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, mOutputRow(0)
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, mHasAlpha(true)
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{
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MOZ_ASSERT(gfxPrefs::ImageDownscaleDuringDecodeEnabled(),
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"Downscaling even though downscale-during-decode is disabled?");
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}
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~DownscalingFilter()
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{
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ReleaseWindow();
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}
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template <typename... Rest>
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nsresult Configure(const DownscalingConfig& aConfig, Rest... aRest)
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{
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nsresult rv = mNext.Configure(aRest...);
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if (NS_FAILED(rv)) {
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return rv;
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}
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if (mNext.IsValidPalettedPipe()) {
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NS_WARNING("Created a downscaler for a paletted surface?");
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return NS_ERROR_INVALID_ARG;
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}
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if (mNext.InputSize() == aConfig.mInputSize) {
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NS_WARNING("Created a downscaler, but not downscaling?");
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return NS_ERROR_INVALID_ARG;
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}
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if (mNext.InputSize().width > aConfig.mInputSize.width) {
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NS_WARNING("Created a downscaler, but width is larger");
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return NS_ERROR_INVALID_ARG;
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}
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if (mNext.InputSize().height > aConfig.mInputSize.height) {
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NS_WARNING("Created a downscaler, but height is larger");
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return NS_ERROR_INVALID_ARG;
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}
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if (aConfig.mInputSize.width <= 0 || aConfig.mInputSize.height <= 0) {
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NS_WARNING("Invalid input size for DownscalingFilter");
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return NS_ERROR_INVALID_ARG;
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}
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mInputSize = aConfig.mInputSize;
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gfx::IntSize outputSize = mNext.InputSize();
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mScale = gfxSize(double(mInputSize.width) / outputSize.width,
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double(mInputSize.height) / outputSize.height);
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mHasAlpha = aConfig.mFormat == gfx::SurfaceFormat::B8G8R8A8;
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ReleaseWindow();
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auto resizeMethod = skia::ImageOperations::RESIZE_LANCZOS3;
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skia::resize::ComputeFilters(resizeMethod,
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mInputSize.width, outputSize.width,
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0, outputSize.width,
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mXFilter.get());
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skia::resize::ComputeFilters(resizeMethod,
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mInputSize.height, outputSize.height,
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0, outputSize.height,
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mYFilter.get());
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// Allocate the buffer, which contains scanlines of the input image.
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mRowBuffer.reset(new (fallible)
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uint8_t[PaddedWidthInBytes(mInputSize.width)]);
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if (MOZ_UNLIKELY(!mRowBuffer)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// Clear the buffer to avoid writing uninitialized memory to the output.
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memset(mRowBuffer.get(), 0, PaddedWidthInBytes(mInputSize.width));
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// Allocate the window, which contains horizontally downscaled scanlines. (We
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// can store scanlines which are already downscaled because our downscaling
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// filter is separable.)
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mWindowCapacity = mYFilter->max_filter();
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mWindow.reset(new (fallible) uint8_t*[mWindowCapacity]);
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if (MOZ_UNLIKELY(!mWindow)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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// Allocate the "window" of recent rows that we keep in memory as input for
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// the downscaling code. We intentionally iterate through the entire array
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// even if an allocation fails, to ensure that all the pointers in it are
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// either valid or nullptr. That in turn ensures that ReleaseWindow() can
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// clean up correctly.
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bool anyAllocationFailed = false;
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const uint32_t windowRowSizeInBytes = PaddedWidthInBytes(outputSize.width);
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for (int32_t i = 0; i < mWindowCapacity; ++i) {
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mWindow[i] = new (fallible) uint8_t[windowRowSizeInBytes];
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anyAllocationFailed = anyAllocationFailed || mWindow[i] == nullptr;
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}
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if (MOZ_UNLIKELY(anyAllocationFailed)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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ConfigureFilter(mInputSize, sizeof(uint32_t));
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return NS_OK;
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}
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Maybe<SurfaceInvalidRect> TakeInvalidRect() override
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{
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Maybe<SurfaceInvalidRect> invalidRect = mNext.TakeInvalidRect();
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if (invalidRect) {
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// Compute the input space invalid rect by scaling.
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invalidRect->mInputSpaceRect.ScaleRoundOut(mScale.width, mScale.height);
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}
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return invalidRect;
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}
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protected:
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uint8_t* DoResetToFirstRow() override
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{
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mNext.ResetToFirstRow();
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mInputRow = 0;
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mOutputRow = 0;
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mRowsInWindow = 0;
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return GetRowPointer();
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}
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uint8_t* DoAdvanceRow() override
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{
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if (mInputRow >= mInputSize.height) {
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NS_WARNING("Advancing DownscalingFilter past the end of the input");
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return nullptr;
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}
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if (mOutputRow >= mNext.InputSize().height) {
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NS_WARNING("Advancing DownscalingFilter past the end of the output");
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return nullptr;
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}
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int32_t filterOffset = 0;
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int32_t filterLength = 0;
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GetFilterOffsetAndLength(mYFilter, mOutputRow,
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&filterOffset, &filterLength);
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int32_t inputRowToRead = filterOffset + mRowsInWindow;
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MOZ_ASSERT(mInputRow <= inputRowToRead, "Reading past end of input");
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if (mInputRow == inputRowToRead) {
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skia::ConvolveHorizontally(mRowBuffer.get(), *mXFilter,
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mWindow[mRowsInWindow++], mHasAlpha,
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supports_sse2() || supports_mmi());
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}
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MOZ_ASSERT(mOutputRow < mNext.InputSize().height,
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"Writing past end of output");
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while (mRowsInWindow == filterLength) {
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DownscaleInputRow();
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if (mOutputRow == mNext.InputSize().height) {
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break; // We're done.
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}
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GetFilterOffsetAndLength(mYFilter, mOutputRow,
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&filterOffset, &filterLength);
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}
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mInputRow++;
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return mInputRow < mInputSize.height ? GetRowPointer()
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: nullptr;
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}
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private:
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uint8_t* GetRowPointer() const { return mRowBuffer.get(); }
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static uint32_t PaddedWidthInBytes(uint32_t aLogicalWidth)
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{
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// Convert from width in BGRA/BGRX pixels to width in bytes, padding by 15
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// to handle overreads by the SIMD code inside Skia.
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return aLogicalWidth * sizeof(uint32_t) + 15;
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}
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static void
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GetFilterOffsetAndLength(UniquePtr<skia::ConvolutionFilter1D>& aFilter,
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int32_t aOutputImagePosition,
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int32_t* aFilterOffsetOut,
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int32_t* aFilterLengthOut)
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{
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MOZ_ASSERT(aOutputImagePosition < aFilter->num_values());
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aFilter->FilterForValue(aOutputImagePosition,
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aFilterOffsetOut,
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aFilterLengthOut);
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}
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void DownscaleInputRow()
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{
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typedef skia::ConvolutionFilter1D::Fixed FilterValue;
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MOZ_ASSERT(mOutputRow < mNext.InputSize().height,
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"Writing past end of output");
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int32_t filterOffset = 0;
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int32_t filterLength = 0;
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MOZ_ASSERT(mOutputRow < mYFilter->num_values());
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auto filterValues =
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mYFilter->FilterForValue(mOutputRow, &filterOffset, &filterLength);
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mNext.template WriteUnsafeComputedRow<uint32_t>([&](uint32_t* aRow,
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uint32_t aLength) {
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skia::ConvolveVertically(static_cast<const FilterValue*>(filterValues),
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filterLength, mWindow.get(), mXFilter->num_values(),
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reinterpret_cast<uint8_t*>(aRow), mHasAlpha,
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supports_sse2() || supports_mmi());
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});
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mOutputRow++;
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if (mOutputRow == mNext.InputSize().height) {
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return; // We're done.
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}
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int32_t newFilterOffset = 0;
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int32_t newFilterLength = 0;
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GetFilterOffsetAndLength(mYFilter, mOutputRow,
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&newFilterOffset, &newFilterLength);
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int diff = newFilterOffset - filterOffset;
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MOZ_ASSERT(diff >= 0, "Moving backwards in the filter?");
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// Shift the buffer. We're just moving pointers here, so this is cheap.
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mRowsInWindow -= diff;
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mRowsInWindow = std::max(mRowsInWindow, 0);
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for (int32_t i = 0; i < mRowsInWindow; ++i) {
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std::swap(mWindow[i], mWindow[filterLength - mRowsInWindow + i]);
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}
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}
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void ReleaseWindow()
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{
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if (!mWindow) {
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return;
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}
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for (int32_t i = 0; i < mWindowCapacity; ++i) {
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delete[] mWindow[i];
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}
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mWindow = nullptr;
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mWindowCapacity = 0;
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}
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Next mNext; /// The next SurfaceFilter in the chain.
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gfx::IntSize mInputSize; /// The size of the input image.
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gfxSize mScale; /// The scale factors in each dimension.
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/// Computed from @mInputSize and
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/// the next filter's input size.
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UniquePtr<uint8_t[]> mRowBuffer; /// The buffer into which input is written.
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UniquePtr<uint8_t*[]> mWindow; /// The last few rows which were written.
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UniquePtr<skia::ConvolutionFilter1D> mXFilter; /// The Lanczos filter in X.
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UniquePtr<skia::ConvolutionFilter1D> mYFilter; /// The Lanczos filter in Y.
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int32_t mWindowCapacity; /// How many rows the window contains.
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int32_t mRowsInWindow; /// How many rows we've buffered in the window.
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int32_t mInputRow; /// The current row we're reading. (0-indexed)
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int32_t mOutputRow; /// The current row we're writing. (0-indexed)
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bool mHasAlpha; /// If true, the image has transparency.
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};
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#endif
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_DownscalingFilter_h
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