gecko-dev/gfx/2d/HelpersSkia.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#ifndef MOZILLA_GFX_HELPERSSKIA_H_
#define MOZILLA_GFX_HELPERSSKIA_H_
#include "2D.h"
#include "skia/include/core/SkCanvas.h"
#include "skia/include/effects/SkDashPathEffect.h"
#include "skia/include/core/SkShader.h"
#include "mozilla/Assertions.h"
#include <vector>
#include "nsDebug.h"
namespace mozilla {
namespace gfx {
static inline SkColorType
GfxFormatToSkiaColorType(SurfaceFormat format)
{
switch (format)
{
case SurfaceFormat::B8G8R8A8:
return kBGRA_8888_SkColorType;
case SurfaceFormat::B8G8R8X8:
// We probably need to do something here.
return kBGRA_8888_SkColorType;
case SurfaceFormat::R5G6B5_UINT16:
return kRGB_565_SkColorType;
case SurfaceFormat::A8:
return kAlpha_8_SkColorType;
default:
return kRGBA_8888_SkColorType;
}
}
static inline SurfaceFormat
SkiaColorTypeToGfxFormat(SkColorType aColorType, SkAlphaType aAlphaType = kPremul_SkAlphaType)
{
switch (aColorType)
{
case kBGRA_8888_SkColorType:
return aAlphaType == kOpaque_SkAlphaType ?
SurfaceFormat::B8G8R8X8 : SurfaceFormat::B8G8R8A8;
case kRGB_565_SkColorType:
return SurfaceFormat::R5G6B5_UINT16;
case kAlpha_8_SkColorType:
return SurfaceFormat::A8;
default:
return SurfaceFormat::B8G8R8A8;
}
}
static inline SkAlphaType
GfxFormatToSkiaAlphaType(SurfaceFormat format)
{
switch (format)
{
case SurfaceFormat::B8G8R8X8:
case SurfaceFormat::R5G6B5_UINT16:
return kOpaque_SkAlphaType;
default:
return kPremul_SkAlphaType;
}
}
static inline SkImageInfo
MakeSkiaImageInfo(const IntSize& aSize, SurfaceFormat aFormat)
{
return SkImageInfo::Make(aSize.width, aSize.height,
GfxFormatToSkiaColorType(aFormat),
GfxFormatToSkiaAlphaType(aFormat));
}
static inline void
GfxMatrixToSkiaMatrix(const Matrix& mat, SkMatrix& retval)
{
retval.setAll(SkFloatToScalar(mat._11), SkFloatToScalar(mat._21), SkFloatToScalar(mat._31),
SkFloatToScalar(mat._12), SkFloatToScalar(mat._22), SkFloatToScalar(mat._32),
0, 0, SK_Scalar1);
}
static inline void
GfxMatrixToSkiaMatrix(const Matrix4x4& aMatrix, SkMatrix& aResult)
{
aResult.setAll(SkFloatToScalar(aMatrix._11), SkFloatToScalar(aMatrix._21), SkFloatToScalar(aMatrix._41),
SkFloatToScalar(aMatrix._12), SkFloatToScalar(aMatrix._22), SkFloatToScalar(aMatrix._42),
SkFloatToScalar(aMatrix._14), SkFloatToScalar(aMatrix._24), SkFloatToScalar(aMatrix._44));
}
static inline SkPaint::Cap
CapStyleToSkiaCap(CapStyle aCap)
{
switch (aCap)
{
case CapStyle::BUTT:
return SkPaint::kButt_Cap;
case CapStyle::ROUND:
return SkPaint::kRound_Cap;
case CapStyle::SQUARE:
return SkPaint::kSquare_Cap;
}
return SkPaint::kDefault_Cap;
}
static inline SkPaint::Join
JoinStyleToSkiaJoin(JoinStyle aJoin)
{
switch (aJoin)
{
case JoinStyle::BEVEL:
return SkPaint::kBevel_Join;
case JoinStyle::ROUND:
return SkPaint::kRound_Join;
case JoinStyle::MITER:
case JoinStyle::MITER_OR_BEVEL:
return SkPaint::kMiter_Join;
}
return SkPaint::kDefault_Join;
}
static inline bool
StrokeOptionsToPaint(SkPaint& aPaint, const StrokeOptions &aOptions)
{
// Skia renders 0 width strokes with a width of 1 (and in black),
// so we should just skip the draw call entirely.
// Skia does not handle non-finite line widths.
if (!aOptions.mLineWidth || !IsFinite(aOptions.mLineWidth)) {
return false;
}
aPaint.setStrokeWidth(SkFloatToScalar(aOptions.mLineWidth));
aPaint.setStrokeMiter(SkFloatToScalar(aOptions.mMiterLimit));
aPaint.setStrokeCap(CapStyleToSkiaCap(aOptions.mLineCap));
aPaint.setStrokeJoin(JoinStyleToSkiaJoin(aOptions.mLineJoin));
if (aOptions.mDashLength > 0) {
// Skia only supports dash arrays that are multiples of 2.
uint32_t dashCount;
if (aOptions.mDashLength % 2 == 0) {
dashCount = aOptions.mDashLength;
} else {
dashCount = aOptions.mDashLength * 2;
}
std::vector<SkScalar> pattern;
pattern.resize(dashCount);
for (uint32_t i = 0; i < dashCount; i++) {
pattern[i] = SkFloatToScalar(aOptions.mDashPattern[i % aOptions.mDashLength]);
}
sk_sp<SkPathEffect> dash = SkDashPathEffect::Make(&pattern.front(),
dashCount,
SkFloatToScalar(aOptions.mDashOffset));
aPaint.setPathEffect(dash);
}
aPaint.setStyle(SkPaint::kStroke_Style);
return true;
}
static inline SkBlendMode
GfxOpToSkiaOp(CompositionOp op)
{
switch (op)
{
case CompositionOp::OP_OVER:
return SkBlendMode::kSrcOver;
case CompositionOp::OP_ADD:
return SkBlendMode::kPlus;
case CompositionOp::OP_ATOP:
return SkBlendMode::kSrcATop;
case CompositionOp::OP_OUT:
return SkBlendMode::kSrcOut;
case CompositionOp::OP_IN:
return SkBlendMode::kSrcIn;
case CompositionOp::OP_SOURCE:
return SkBlendMode::kSrc;
case CompositionOp::OP_DEST_IN:
return SkBlendMode::kDstIn;
case CompositionOp::OP_DEST_OUT:
return SkBlendMode::kDstOut;
case CompositionOp::OP_DEST_OVER:
return SkBlendMode::kDstOver;
case CompositionOp::OP_DEST_ATOP:
return SkBlendMode::kDstATop;
case CompositionOp::OP_XOR:
return SkBlendMode::kXor;
case CompositionOp::OP_MULTIPLY:
return SkBlendMode::kMultiply;
case CompositionOp::OP_SCREEN:
return SkBlendMode::kScreen;
case CompositionOp::OP_OVERLAY:
return SkBlendMode::kOverlay;
case CompositionOp::OP_DARKEN:
return SkBlendMode::kDarken;
case CompositionOp::OP_LIGHTEN:
return SkBlendMode::kLighten;
case CompositionOp::OP_COLOR_DODGE:
return SkBlendMode::kColorDodge;
case CompositionOp::OP_COLOR_BURN:
return SkBlendMode::kColorBurn;
case CompositionOp::OP_HARD_LIGHT:
return SkBlendMode::kHardLight;
case CompositionOp::OP_SOFT_LIGHT:
return SkBlendMode::kSoftLight;
case CompositionOp::OP_DIFFERENCE:
return SkBlendMode::kDifference;
case CompositionOp::OP_EXCLUSION:
return SkBlendMode::kExclusion;
case CompositionOp::OP_HUE:
return SkBlendMode::kHue;
case CompositionOp::OP_SATURATION:
return SkBlendMode::kSaturation;
case CompositionOp::OP_COLOR:
return SkBlendMode::kColor;
case CompositionOp::OP_LUMINOSITY:
return SkBlendMode::kLuminosity;
default:
return SkBlendMode::kSrcOver;
}
}
/* There's quite a bit of inconsistency about
* whether float colors should be rounded with .5f.
* We choose to do it to match cairo which also
* happens to match the Direct3D specs */
static inline U8CPU ColorFloatToByte(Float color)
{
//XXX: do a better job converting to int
return U8CPU(color*255.f + .5f);
};
static inline SkColor ColorToSkColor(const Color &color, Float aAlpha)
{
return SkColorSetARGB(ColorFloatToByte(color.a*aAlpha), ColorFloatToByte(color.r),
ColorFloatToByte(color.g), ColorFloatToByte(color.b));
}
static inline SkPoint
PointToSkPoint(const Point &aPoint)
{
return SkPoint::Make(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
}
static inline SkRect
RectToSkRect(const Rect& aRect)
{
return SkRect::MakeXYWH(SkFloatToScalar(aRect.X()), SkFloatToScalar(aRect.Y()),
SkFloatToScalar(aRect.Width()), SkFloatToScalar(aRect.Height()));
}
static inline SkRect
IntRectToSkRect(const IntRect& aRect)
{
return SkRect::MakeXYWH(SkIntToScalar(aRect.X()), SkIntToScalar(aRect.Y()),
SkIntToScalar(aRect.Width()), SkIntToScalar(aRect.Height()));
}
static inline SkIRect
RectToSkIRect(const Rect& aRect)
{
return SkIRect::MakeXYWH(int32_t(aRect.X()), int32_t(aRect.Y()),
int32_t(aRect.Width()), int32_t(aRect.Height()));
}
static inline SkIRect
IntRectToSkIRect(const IntRect& aRect)
{
return SkIRect::MakeXYWH(aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
}
static inline IntRect
SkIRectToIntRect(const SkIRect& aRect)
{
return IntRect(aRect.x(), aRect.y(), aRect.width(), aRect.height());
}
static inline Point
SkPointToPoint(const SkPoint &aPoint)
{
return Point(SkScalarToFloat(aPoint.x()), SkScalarToFloat(aPoint.y()));
}
static inline Rect
SkRectToRect(const SkRect &aRect)
{
return Rect(SkScalarToFloat(aRect.x()), SkScalarToFloat(aRect.y()),
SkScalarToFloat(aRect.width()), SkScalarToFloat(aRect.height()));
}
static inline SkShader::TileMode
ExtendModeToTileMode(ExtendMode aMode, Axis aAxis)
{
switch (aMode)
{
case ExtendMode::CLAMP:
return SkShader::kClamp_TileMode;
case ExtendMode::REPEAT:
return SkShader::kRepeat_TileMode;
case ExtendMode::REFLECT:
return SkShader::kMirror_TileMode;
case ExtendMode::REPEAT_X:
{
return aAxis == Axis::X_AXIS
? SkShader::kRepeat_TileMode
: SkShader::kClamp_TileMode;
}
case ExtendMode::REPEAT_Y:
{
return aAxis == Axis::Y_AXIS
? SkShader::kRepeat_TileMode
: SkShader::kClamp_TileMode;
}
}
return SkShader::kClamp_TileMode;
}
static inline SkPaint::Hinting
GfxHintingToSkiaHinting(FontHinting aHinting)
{
switch (aHinting) {
case FontHinting::NONE:
return SkPaint::kNo_Hinting;
case FontHinting::LIGHT:
return SkPaint::kSlight_Hinting;
case FontHinting::NORMAL:
return SkPaint::kNormal_Hinting;
case FontHinting::FULL:
return SkPaint::kFull_Hinting;
}
return SkPaint::kNormal_Hinting;
}
static inline FillRule GetFillRule(SkPath::FillType aFillType)
{
switch (aFillType)
{
case SkPath::kWinding_FillType:
return FillRule::FILL_WINDING;
case SkPath::kEvenOdd_FillType:
return FillRule::FILL_EVEN_ODD;
case SkPath::kInverseWinding_FillType:
case SkPath::kInverseEvenOdd_FillType:
default:
NS_WARNING("Unsupported fill type\n");
break;
}
return FillRule::FILL_EVEN_ODD;
}
/**
* Returns true if the canvas is backed by pixels. Returns false if the canvas
* wraps an SkPDFDocument, for example.
*
* Note: It is not clear whether the test used to implement this function may
* result in it returning false in some circumstances even when the canvas
* _is_ pixel backed. In other words maybe it is possible for such a canvas to
* have kUnknown_SkPixelGeometry?
*/
static inline bool IsBackedByPixels(const SkCanvas* aCanvas)
{
SkSurfaceProps props(0, kUnknown_SkPixelGeometry);
if (!aCanvas->getProps(&props) ||
props.pixelGeometry() == kUnknown_SkPixelGeometry) {
return false;
}
return true;
}
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */