gecko/gfx/2d/HelpersSkia.h

120 lines
3.2 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/SkCanvas.h"
#include "skia/SkDashPathEffect.h"
#include "mozilla/Assertions.h"
namespace mozilla {
namespace gfx {
static inline SkBitmap::Config
GfxFormatToSkiaConfig(SurfaceFormat format)
{
switch (format)
{
case FORMAT_B8G8R8A8:
return SkBitmap::kARGB_8888_Config;
case FORMAT_B8G8R8X8:
// We probably need to do something here.
return SkBitmap::kARGB_8888_Config;
case FORMAT_R5G6B5:
return SkBitmap::kRGB_565_Config;
case FORMAT_A8:
return SkBitmap::kA8_Config;
}
return SkBitmap::kARGB_8888_Config;
}
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 CAP_BUTT:
return SkPaint::kButt_Cap;
case CAP_ROUND:
return SkPaint::kRound_Cap;
case CAP_SQUARE:
return SkPaint::kSquare_Cap;
}
return SkPaint::kDefault_Cap;
}
static inline SkPaint::Join
JoinStyleToSkiaJoin(JoinStyle aJoin)
{
switch (aJoin)
{
case JOIN_BEVEL:
return SkPaint::kBevel_Join;
case JOIN_ROUND:
return SkPaint::kRound_Join;
case JOIN_MITER:
case JOIN_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]);
}
SkDashPathEffect* dash = new SkDashPathEffect(&pattern.front(),
dashCount,
SkFloatToScalar(aOptions.mDashOffset));
SkSafeUnref(aPaint.setPathEffect(dash));
}
aPaint.setStyle(SkPaint::kStroke_Style);
return true;
}
}
}
#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */