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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_VCL_INC_SKIA_UTILS_H
#define INCLUDED_VCL_INC_SKIA_UTILS_H
#include <vcl/skia/SkiaHelper.hxx>
#include <tools/gen.hxx>
#include <driverblocklist.hxx>
#include <vcl/bitmap.hxx>
#include <vcl/salgtype.hxx>
#include <premac.h>
#include <SkRegion.h>
#include <SkSurface.h>
#include <tools/sk_app/WindowContext.h>
#include <postmac.h>
namespace SkiaHelper
{
// Get the one shared GrDirectContext instance.
GrDirectContext* getSharedGrDirectContext();
void disableRenderMethod(RenderMethod method);
// Create SkSurface, GPU-backed if possible.
VCL_DLLPUBLIC sk_sp<SkSurface> createSkSurface(int width, int height,
SkColorType type = kN32_SkColorType,
SkAlphaType alpha = kPremul_SkAlphaType);
inline sk_sp<SkSurface> createSkSurface(const Size& size, SkColorType type = kN32_SkColorType,
SkAlphaType alpha = kPremul_SkAlphaType)
{
return createSkSurface(size.Width(), size.Height(), type, alpha);
}
inline sk_sp<SkSurface> createSkSurface(int width, int height, SkAlphaType alpha)
{
return createSkSurface(width, height, kN32_SkColorType, alpha);
}
inline sk_sp<SkSurface> createSkSurface(const Size& size, SkAlphaType alpha)
{
return createSkSurface(size.Width(), size.Height(), kN32_SkColorType, alpha);
}
// Create SkImage, GPU-backed if possible.
VCL_DLLPUBLIC sk_sp<SkImage> createSkImage(const SkBitmap& bitmap);
// Call surface->makeImageSnapshot() and abort on failure.
VCL_DLLPUBLIC sk_sp<SkImage> makeCheckedImageSnapshot(sk_sp<SkSurface> surface);
VCL_DLLPUBLIC sk_sp<SkImage> makeCheckedImageSnapshot(sk_sp<SkSurface> surface,
const SkIRect& bounds);
inline Size imageSize(const sk_sp<SkImage>& image) { return Size(image->width(), image->height()); }
// Must be called in any VCL backend before any Skia functionality is used.
// If not set, Skia will be disabled.
VCL_DLLPUBLIC void
prepareSkia(std::unique_ptr<sk_app::WindowContext> (*createGpuWindowContext)(bool));
// Shared cache of images.
void addCachedImage(const OString& key, sk_sp<SkImage> image);
sk_sp<SkImage> findCachedImage(const OString& key);
void removeCachedImage(sk_sp<SkImage> image);
tools::Long maxImageCacheSize();
// SkSurfaceProps to be used by all Skia surfaces.
VCL_DLLPUBLIC const SkSurfaceProps* surfaceProps();
// Set pixel geometry to be used by SkSurfaceProps.
VCL_DLLPUBLIC void setPixelGeometry(SkPixelGeometry pixelGeometry);
// Normal scaling algorithms have a poor quality when downscaling a lot.
// https://bugs.chromium.org/p/skia/issues/detail?id=11810 suggests to use mipmaps
// in such a case, which is annoying to do explicitly instead of Skia deciding which
// algorithm would be the best, but now with Skia removing SkFilterQuality and requiring
// explicitly being told what algorithm to use this appears to be the best we can do.
// Anything scaled down at least this ratio will use linear+mipmaps.
constexpr int downscaleRatioThreshold = 4;
inline SkSamplingOptions makeSamplingOptions(BmpScaleFlag scaling, const SkMatrix& matrix)
{
switch (scaling)
{
case BmpScaleFlag::BestQuality:
if (matrix.getScaleX() <= 1.0 / downscaleRatioThreshold
|| matrix.getScaleY() <= 1.0 / downscaleRatioThreshold)
return SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear);
return SkSamplingOptions(SkCubicResampler::Mitchell());
case BmpScaleFlag::Default:
return SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kNone);
case BmpScaleFlag::Fast:
return SkSamplingOptions(SkFilterMode::kNearest, SkMipmapMode::kNone);
default:
assert(false);
return SkSamplingOptions();
}
}
inline SkSamplingOptions makeSamplingOptions(BmpScaleFlag scaling, const Size& srcSize,
const Size& destSize)
{
switch (scaling)
{
case BmpScaleFlag::BestQuality:
if (srcSize.Width() / destSize.Width() >= downscaleRatioThreshold
|| srcSize.Height() / destSize.Height() >= downscaleRatioThreshold)
return SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear);
return SkSamplingOptions(SkCubicResampler::Mitchell());
case BmpScaleFlag::Default:
return SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kNone);
case BmpScaleFlag::Fast:
return SkSamplingOptions(SkFilterMode::kNearest, SkMipmapMode::kNone);
default:
assert(false);
return SkSamplingOptions();
}
}
inline SkSamplingOptions makeSamplingOptions(const SalTwoRect& rPosAry)
{
if (rPosAry.mnSrcWidth != rPosAry.mnDestWidth || rPosAry.mnSrcHeight != rPosAry.mnDestHeight)
{
if (rPosAry.mnSrcWidth / rPosAry.mnDestWidth >= downscaleRatioThreshold
|| rPosAry.mnSrcHeight / rPosAry.mnDestHeight >= downscaleRatioThreshold)
return SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear);
return SkSamplingOptions(SkCubicResampler::Mitchell()); // best
}
return SkSamplingOptions(); // none
}
#ifdef DBG_UTIL
void prefillSurface(const sk_sp<SkSurface>& surface);
VCL_DLLPUBLIC void dump(const SkBitmap& bitmap, const char* file);
VCL_DLLPUBLIC void dump(const sk_sp<SkImage>& image, const char* file);
VCL_DLLPUBLIC void dump(const sk_sp<SkSurface>& surface, const char* file);
#endif
VCL_DLLPUBLIC extern uint32_t vendorId;
inline DriverBlocklist::DeviceVendor getVendor()
{
return DriverBlocklist::GetVendorFromId(vendorId);
}
} // namespace SkiaHelper
// For unittests.
namespace SkiaTests
{
VCL_DLLPUBLIC bool matrixNeedsHighQuality(const SkMatrix& matrix);
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const SkRect& rectangle)
{
if (rectangle.isEmpty())
return stream << "EMPTY";
else
return stream << rectangle.width() << 'x' << rectangle.height() << "@(" << rectangle.x()
<< ',' << rectangle.y() << ")";
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const SkIRect& rectangle)
{
if (rectangle.isEmpty())
return stream << "EMPTY";
else
return stream << rectangle.width() << 'x' << rectangle.height() << "@(" << rectangle.x()
<< ',' << rectangle.y() << ")";
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const SkRegion& region)
{
if (region.isEmpty())
return stream << "EMPTY";
stream << "(";
SkRegion::Iterator it(region);
for (int i = 0; !it.done(); it.next(), ++i)
stream << "[" << i << "] " << it.rect();
stream << ")";
return stream;
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const SkMatrix& matrix)
{
return stream << "[" << matrix[0] << " " << matrix[1] << " " << matrix[2] << "]"
<< "[" << matrix[3] << " " << matrix[4] << " " << matrix[5] << "]"
<< "[" << matrix[6] << " " << matrix[7] << " " << matrix[8] << "]";
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const SkImage& image)
{
// G - on GPU
return stream << static_cast<const void*>(&image) << " " << Size(image.width(), image.height())
<< "/" << (SkColorTypeBytesPerPixel(image.imageInfo().colorType()) * 8)
<< (image.isTextureBacked() ? "G" : "");
}
template <typename charT, typename traits>
inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
const sk_sp<SkImage>& image)
{
if (image == nullptr)
return stream << "(null)";
return stream << *image;
}
#endif // INCLUDED_VCL_INC_SKIA_UTILS_H
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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