340 lines
9.9 KiB
C++
340 lines
9.9 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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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#ifndef MOZILLA_GFX_HELPERSSKIA_H_
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#define MOZILLA_GFX_HELPERSSKIA_H_
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#include "2D.h"
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#include "skia/include/core/SkCanvas.h"
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#include "skia/include/effects/SkDashPathEffect.h"
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#include "skia/include/core/SkShader.h"
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#ifdef USE_SKIA_GPU
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#include "skia/include/gpu/GrTypes.h"
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#endif
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#include "mozilla/Assertions.h"
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#include <vector>
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#include "RefPtrSkia.h"
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namespace mozilla {
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namespace gfx {
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static inline SkColorType
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GfxFormatToSkiaColorType(SurfaceFormat format)
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{
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switch (format)
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{
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case SurfaceFormat::B8G8R8A8:
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return kBGRA_8888_SkColorType;
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case SurfaceFormat::B8G8R8X8:
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// We probably need to do something here.
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return kBGRA_8888_SkColorType;
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case SurfaceFormat::R5G6B5_UINT16:
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return kRGB_565_SkColorType;
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case SurfaceFormat::A8:
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return kAlpha_8_SkColorType;
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default:
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return kRGBA_8888_SkColorType;
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}
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}
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static inline SurfaceFormat
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SkiaColorTypeToGfxFormat(SkColorType type)
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{
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switch (type)
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{
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case kBGRA_8888_SkColorType:
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return SurfaceFormat::B8G8R8A8;
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case kRGB_565_SkColorType:
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return SurfaceFormat::R5G6B5_UINT16;
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case kAlpha_8_SkColorType:
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return SurfaceFormat::A8;
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default:
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return SurfaceFormat::B8G8R8A8;
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}
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}
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#ifdef USE_SKIA_GPU
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static inline GrPixelConfig
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GfxFormatToGrConfig(SurfaceFormat format)
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{
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switch (format)
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{
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case SurfaceFormat::B8G8R8A8:
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return kBGRA_8888_GrPixelConfig;
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case SurfaceFormat::B8G8R8X8:
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// We probably need to do something here.
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return kBGRA_8888_GrPixelConfig;
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case SurfaceFormat::R5G6B5_UINT16:
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return kRGB_565_GrPixelConfig;
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case SurfaceFormat::A8:
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return kAlpha_8_GrPixelConfig;
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default:
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return kRGBA_8888_GrPixelConfig;
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}
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}
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#endif
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static inline void
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GfxMatrixToSkiaMatrix(const Matrix& mat, SkMatrix& retval)
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{
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retval.setAll(SkFloatToScalar(mat._11), SkFloatToScalar(mat._21), SkFloatToScalar(mat._31),
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SkFloatToScalar(mat._12), SkFloatToScalar(mat._22), SkFloatToScalar(mat._32),
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0, 0, SK_Scalar1);
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}
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static inline SkPaint::Cap
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CapStyleToSkiaCap(CapStyle aCap)
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{
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switch (aCap)
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{
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case CapStyle::BUTT:
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return SkPaint::kButt_Cap;
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case CapStyle::ROUND:
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return SkPaint::kRound_Cap;
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case CapStyle::SQUARE:
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return SkPaint::kSquare_Cap;
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}
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return SkPaint::kDefault_Cap;
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}
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static inline SkPaint::Join
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JoinStyleToSkiaJoin(JoinStyle aJoin)
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{
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switch (aJoin)
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{
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case JoinStyle::BEVEL:
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return SkPaint::kBevel_Join;
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case JoinStyle::ROUND:
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return SkPaint::kRound_Join;
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case JoinStyle::MITER:
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case JoinStyle::MITER_OR_BEVEL:
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return SkPaint::kMiter_Join;
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}
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return SkPaint::kDefault_Join;
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}
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static inline bool
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StrokeOptionsToPaint(SkPaint& aPaint, const StrokeOptions &aOptions)
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{
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// Skia renders 0 width strokes with a width of 1 (and in black),
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// so we should just skip the draw call entirely.
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if (!aOptions.mLineWidth) {
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return false;
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}
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aPaint.setStrokeWidth(SkFloatToScalar(aOptions.mLineWidth));
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aPaint.setStrokeMiter(SkFloatToScalar(aOptions.mMiterLimit));
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aPaint.setStrokeCap(CapStyleToSkiaCap(aOptions.mLineCap));
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aPaint.setStrokeJoin(JoinStyleToSkiaJoin(aOptions.mLineJoin));
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if (aOptions.mDashLength > 0) {
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// Skia only supports dash arrays that are multiples of 2.
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uint32_t dashCount;
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if (aOptions.mDashLength % 2 == 0) {
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dashCount = aOptions.mDashLength;
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} else {
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dashCount = aOptions.mDashLength * 2;
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}
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std::vector<SkScalar> pattern;
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pattern.resize(dashCount);
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for (uint32_t i = 0; i < dashCount; i++) {
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pattern[i] = SkFloatToScalar(aOptions.mDashPattern[i % aOptions.mDashLength]);
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// bugs 1002466 & 1214309 - Dash intervals that are (close to) zero
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// are skipped, ignoring other stroke settings. Nudge the dash interval
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// to be just large enough that it is not interpreted as degenerate.
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// Ideally this value would just be SK_ScalarNearlyZero, the smallest
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// reasonable value that is not zero. But error in FP operations may
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// cause dash intervals to result in a value less than this and still
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// be skipped. To give some headroom to allow the value to still come
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// out greater-than-but-still-close-to SK_ScalarNearlyZero, fudge it
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// upward by *33/32.
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if (pattern[i] == 0)
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pattern[i] = SkScalarMulDiv(SK_ScalarNearlyZero, 33, 32);
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}
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SkDashPathEffect* dash = SkDashPathEffect::Create(&pattern.front(),
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dashCount,
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SkFloatToScalar(aOptions.mDashOffset));
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SkSafeUnref(aPaint.setPathEffect(dash));
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}
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aPaint.setStyle(SkPaint::kStroke_Style);
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return true;
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}
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static inline SkXfermode::Mode
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GfxOpToSkiaOp(CompositionOp op)
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{
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switch (op)
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{
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case CompositionOp::OP_OVER:
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return SkXfermode::kSrcOver_Mode;
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case CompositionOp::OP_ADD:
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return SkXfermode::kPlus_Mode;
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case CompositionOp::OP_ATOP:
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return SkXfermode::kSrcATop_Mode;
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case CompositionOp::OP_OUT:
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return SkXfermode::kSrcOut_Mode;
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case CompositionOp::OP_IN:
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return SkXfermode::kSrcIn_Mode;
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case CompositionOp::OP_SOURCE:
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return SkXfermode::kSrc_Mode;
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case CompositionOp::OP_DEST_IN:
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return SkXfermode::kDstIn_Mode;
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case CompositionOp::OP_DEST_OUT:
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return SkXfermode::kDstOut_Mode;
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case CompositionOp::OP_DEST_OVER:
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return SkXfermode::kDstOver_Mode;
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case CompositionOp::OP_DEST_ATOP:
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return SkXfermode::kDstATop_Mode;
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case CompositionOp::OP_XOR:
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return SkXfermode::kXor_Mode;
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case CompositionOp::OP_MULTIPLY:
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return SkXfermode::kMultiply_Mode;
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case CompositionOp::OP_SCREEN:
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return SkXfermode::kScreen_Mode;
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case CompositionOp::OP_OVERLAY:
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return SkXfermode::kOverlay_Mode;
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case CompositionOp::OP_DARKEN:
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return SkXfermode::kDarken_Mode;
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case CompositionOp::OP_LIGHTEN:
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return SkXfermode::kLighten_Mode;
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case CompositionOp::OP_COLOR_DODGE:
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return SkXfermode::kColorDodge_Mode;
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case CompositionOp::OP_COLOR_BURN:
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return SkXfermode::kColorBurn_Mode;
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case CompositionOp::OP_HARD_LIGHT:
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return SkXfermode::kHardLight_Mode;
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case CompositionOp::OP_SOFT_LIGHT:
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return SkXfermode::kSoftLight_Mode;
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case CompositionOp::OP_DIFFERENCE:
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return SkXfermode::kDifference_Mode;
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case CompositionOp::OP_EXCLUSION:
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return SkXfermode::kExclusion_Mode;
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case CompositionOp::OP_HUE:
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return SkXfermode::kHue_Mode;
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case CompositionOp::OP_SATURATION:
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return SkXfermode::kSaturation_Mode;
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case CompositionOp::OP_COLOR:
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return SkXfermode::kColor_Mode;
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case CompositionOp::OP_LUMINOSITY:
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return SkXfermode::kLuminosity_Mode;
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default:
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return SkXfermode::kSrcOver_Mode;
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}
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}
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/* There's quite a bit of inconsistency about
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* whether float colors should be rounded with .5f.
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* We choose to do it to match cairo which also
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* happens to match the Direct3D specs */
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static inline U8CPU ColorFloatToByte(Float color)
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{
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//XXX: do a better job converting to int
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return U8CPU(color*255.f + .5f);
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};
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static inline SkColor ColorToSkColor(const Color &color, Float aAlpha)
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{
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return SkColorSetARGB(ColorFloatToByte(color.a*aAlpha), ColorFloatToByte(color.r),
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ColorFloatToByte(color.g), ColorFloatToByte(color.b));
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}
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static inline SkPoint
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PointToSkPoint(const Point &aPoint)
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{
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return SkPoint::Make(SkFloatToScalar(aPoint.x), SkFloatToScalar(aPoint.y));
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}
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static inline SkRect
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RectToSkRect(const Rect& aRect)
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{
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return SkRect::MakeXYWH(SkFloatToScalar(aRect.x), SkFloatToScalar(aRect.y),
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SkFloatToScalar(aRect.width), SkFloatToScalar(aRect.height));
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}
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static inline SkRect
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IntRectToSkRect(const IntRect& aRect)
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{
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return SkRect::MakeXYWH(SkIntToScalar(aRect.x), SkIntToScalar(aRect.y),
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SkIntToScalar(aRect.width), SkIntToScalar(aRect.height));
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}
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static inline SkIRect
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RectToSkIRect(const Rect& aRect)
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{
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return SkIRect::MakeXYWH(int32_t(aRect.x), int32_t(aRect.y),
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int32_t(aRect.width), int32_t(aRect.height));
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}
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static inline SkIRect
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IntRectToSkIRect(const IntRect& aRect)
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{
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return SkIRect::MakeXYWH(aRect.x, aRect.y, aRect.width, aRect.height);
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}
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static inline Point
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SkPointToPoint(const SkPoint &aPoint)
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{
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return Point(SkScalarToFloat(aPoint.x()), SkScalarToFloat(aPoint.y()));
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}
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static inline Rect
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SkRectToRect(const SkRect &aRect)
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{
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return Rect(SkScalarToFloat(aRect.x()), SkScalarToFloat(aRect.y()),
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SkScalarToFloat(aRect.width()), SkScalarToFloat(aRect.height()));
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}
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static inline SkShader::TileMode
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ExtendModeToTileMode(ExtendMode aMode, Axis aAxis)
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{
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switch (aMode)
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{
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case ExtendMode::CLAMP:
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return SkShader::kClamp_TileMode;
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case ExtendMode::REPEAT:
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return SkShader::kRepeat_TileMode;
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case ExtendMode::REFLECT:
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return SkShader::kMirror_TileMode;
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case ExtendMode::REPEAT_X:
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{
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return aAxis == Axis::X_AXIS
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? SkShader::kRepeat_TileMode
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: SkShader::kClamp_TileMode;
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}
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case ExtendMode::REPEAT_Y:
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{
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return aAxis == Axis::Y_AXIS
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? SkShader::kRepeat_TileMode
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: SkShader::kClamp_TileMode;
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}
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}
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return SkShader::kClamp_TileMode;
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}
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static inline SkPaint::Hinting
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GfxHintingToSkiaHinting(FontHinting aHinting)
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{
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switch (aHinting) {
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case FontHinting::NONE:
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return SkPaint::kNo_Hinting;
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case FontHinting::LIGHT:
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return SkPaint::kSlight_Hinting;
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case FontHinting::NORMAL:
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return SkPaint::kNormal_Hinting;
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case FontHinting::FULL:
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return SkPaint::kFull_Hinting;
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}
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return SkPaint::kNormal_Hinting;
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}
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} // namespace gfx
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} // namespace mozilla
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#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */
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