gecko/gfx/2d/HelpersSkia.h

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2012-05-21 04:12:37 -07:00
* 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 "skia/SkShader.h"
#include "mozilla/Assertions.h"
#include <vector>
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;
}
static inline void
ConvertBGRXToBGRA(unsigned char* aData, const IntSize &aSize, int32_t aStride)
{
uint32_t* pixel = reinterpret_cast<uint32_t*>(aData);
for (int row = 0; row < aSize.height; ++row) {
for (int column = 0; column < aSize.width; ++column) {
pixel[column] |= 0xFF000000;
}
pixel += (aStride/4);
}
}
static inline SkXfermode::Mode
GfxOpToSkiaOp(CompositionOp op)
{
switch (op)
{
case OP_OVER:
return SkXfermode::kSrcOver_Mode;
case OP_ADD:
return SkXfermode::kPlus_Mode;
case OP_ATOP:
return SkXfermode::kSrcATop_Mode;
case OP_OUT:
return SkXfermode::kSrcOut_Mode;
case OP_IN:
return SkXfermode::kSrcIn_Mode;
case OP_SOURCE:
return SkXfermode::kSrc_Mode;
case OP_DEST_IN:
return SkXfermode::kDstIn_Mode;
case OP_DEST_OUT:
return SkXfermode::kDstOut_Mode;
case OP_DEST_OVER:
return SkXfermode::kDstOver_Mode;
case OP_DEST_ATOP:
return SkXfermode::kDstATop_Mode;
case OP_XOR:
return SkXfermode::kXor_Mode;
case OP_COUNT:
return SkXfermode::kSrcOver_Mode;
}
return SkXfermode::kSrcOver_Mode;
}
static inline SkColor ColorToSkColor(const Color &color, Float aAlpha)
{
//XXX: do a better job converting to int
return SkColorSetARGB(U8CPU(color.a*aAlpha*255.0), U8CPU(color.r*255.0),
U8CPU(color.g*255.0), U8CPU(color.b*255.0));
}
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 SkShader::TileMode
ExtendModeToTileMode(ExtendMode aMode)
{
switch (aMode)
{
case EXTEND_CLAMP:
return SkShader::kClamp_TileMode;
case EXTEND_REPEAT:
return SkShader::kRepeat_TileMode;
case EXTEND_REFLECT:
return SkShader::kMirror_TileMode;
}
return SkShader::kClamp_TileMode;
}
}
}
#endif /* MOZILLA_GFX_HELPERSSKIA_H_ */