tenfourfox/gfx/2d/HelpersSkia.h
Cameron Kaiser c9b2922b70 hello FPR
2017-04-19 00:56:45 -07:00

340 lines
9.9 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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"
#ifdef USE_SKIA_GPU
#include "skia/include/gpu/GrTypes.h"
#endif
#include "mozilla/Assertions.h"
#include <vector>
#include "RefPtrSkia.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 type)
{
switch (type)
{
case kBGRA_8888_SkColorType:
return SurfaceFormat::B8G8R8A8;
case kRGB_565_SkColorType:
return SurfaceFormat::R5G6B5_UINT16;
case kAlpha_8_SkColorType:
return SurfaceFormat::A8;
default:
return SurfaceFormat::B8G8R8A8;
}
}
#ifdef USE_SKIA_GPU
static inline GrPixelConfig
GfxFormatToGrConfig(SurfaceFormat format)
{
switch (format)
{
case SurfaceFormat::B8G8R8A8:
return kBGRA_8888_GrPixelConfig;
case SurfaceFormat::B8G8R8X8:
// We probably need to do something here.
return kBGRA_8888_GrPixelConfig;
case SurfaceFormat::R5G6B5_UINT16:
return kRGB_565_GrPixelConfig;
case SurfaceFormat::A8:
return kAlpha_8_GrPixelConfig;
default:
return kRGBA_8888_GrPixelConfig;
}
}
#endif
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 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.
if (!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]);
// bugs 1002466 & 1214309 - Dash intervals that are (close to) zero
// are skipped, ignoring other stroke settings. Nudge the dash interval
// to be just large enough that it is not interpreted as degenerate.
// Ideally this value would just be SK_ScalarNearlyZero, the smallest
// reasonable value that is not zero. But error in FP operations may
// cause dash intervals to result in a value less than this and still
// be skipped. To give some headroom to allow the value to still come
// out greater-than-but-still-close-to SK_ScalarNearlyZero, fudge it
// upward by *33/32.
if (pattern[i] == 0)
pattern[i] = SkScalarMulDiv(SK_ScalarNearlyZero, 33, 32);
}
SkDashPathEffect* dash = SkDashPathEffect::Create(&pattern.front(),
dashCount,
SkFloatToScalar(aOptions.mDashOffset));
SkSafeUnref(aPaint.setPathEffect(dash));
}
aPaint.setStyle(SkPaint::kStroke_Style);
return true;
}
static inline SkXfermode::Mode
GfxOpToSkiaOp(CompositionOp op)
{
switch (op)
{
case CompositionOp::OP_OVER:
return SkXfermode::kSrcOver_Mode;
case CompositionOp::OP_ADD:
return SkXfermode::kPlus_Mode;
case CompositionOp::OP_ATOP:
return SkXfermode::kSrcATop_Mode;
case CompositionOp::OP_OUT:
return SkXfermode::kSrcOut_Mode;
case CompositionOp::OP_IN:
return SkXfermode::kSrcIn_Mode;
case CompositionOp::OP_SOURCE:
return SkXfermode::kSrc_Mode;
case CompositionOp::OP_DEST_IN:
return SkXfermode::kDstIn_Mode;
case CompositionOp::OP_DEST_OUT:
return SkXfermode::kDstOut_Mode;
case CompositionOp::OP_DEST_OVER:
return SkXfermode::kDstOver_Mode;
case CompositionOp::OP_DEST_ATOP:
return SkXfermode::kDstATop_Mode;
case CompositionOp::OP_XOR:
return SkXfermode::kXor_Mode;
case CompositionOp::OP_MULTIPLY:
return SkXfermode::kMultiply_Mode;
case CompositionOp::OP_SCREEN:
return SkXfermode::kScreen_Mode;
case CompositionOp::OP_OVERLAY:
return SkXfermode::kOverlay_Mode;
case CompositionOp::OP_DARKEN:
return SkXfermode::kDarken_Mode;
case CompositionOp::OP_LIGHTEN:
return SkXfermode::kLighten_Mode;
case CompositionOp::OP_COLOR_DODGE:
return SkXfermode::kColorDodge_Mode;
case CompositionOp::OP_COLOR_BURN:
return SkXfermode::kColorBurn_Mode;
case CompositionOp::OP_HARD_LIGHT:
return SkXfermode::kHardLight_Mode;
case CompositionOp::OP_SOFT_LIGHT:
return SkXfermode::kSoftLight_Mode;
case CompositionOp::OP_DIFFERENCE:
return SkXfermode::kDifference_Mode;
case CompositionOp::OP_EXCLUSION:
return SkXfermode::kExclusion_Mode;
case CompositionOp::OP_HUE:
return SkXfermode::kHue_Mode;
case CompositionOp::OP_SATURATION:
return SkXfermode::kSaturation_Mode;
case CompositionOp::OP_COLOR:
return SkXfermode::kColor_Mode;
case CompositionOp::OP_LUMINOSITY:
return SkXfermode::kLuminosity_Mode;
default:
return SkXfermode::kSrcOver_Mode;
}
}
/* 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 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;
}
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */