gecko-dev/gfx/2d/HelpersD2D.h

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/* -*- 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_HELPERSD2D_H_
#define MOZILLA_GFX_HELPERSD2D_H_
#include <d2d1.h>
#include <dwrite.h>
#include "2D.h"
#include "ScaledFontDWrite.h"
namespace mozilla {
namespace gfx {
static inline D2D1_POINT_2F D2DPoint(const Point &aPoint)
{
return D2D1::Point2F(aPoint.x, aPoint.y);
}
static inline D2D1_SIZE_U D2DIntSize(const IntSize &aSize)
{
return D2D1::SizeU(aSize.width, aSize.height);
}
static inline D2D1_RECT_F D2DRect(const Rect &aRect)
{
return D2D1::RectF(aRect.x, aRect.y, aRect.XMost(), aRect.YMost());
}
static inline D2D1_EXTEND_MODE D2DExtend(ExtendMode aExtendMode)
{
D2D1_EXTEND_MODE extend;
switch (aExtendMode) {
case EXTEND_REPEAT:
extend = D2D1_EXTEND_MODE_WRAP;
break;
case EXTEND_REFLECT:
extend = D2D1_EXTEND_MODE_MIRROR;
break;
default:
extend = D2D1_EXTEND_MODE_CLAMP;
}
return extend;
}
static inline D2D1_BITMAP_INTERPOLATION_MODE D2DFilter(const Filter &aFilter)
{
switch (aFilter) {
case FILTER_POINT:
return D2D1_BITMAP_INTERPOLATION_MODE_NEAREST_NEIGHBOR;
default:
return D2D1_BITMAP_INTERPOLATION_MODE_LINEAR;
}
}
static inline D2D1_ANTIALIAS_MODE D2DAAMode(AntialiasMode aMode)
{
switch (aMode) {
case AA_NONE:
return D2D1_ANTIALIAS_MODE_ALIASED;
default:
return D2D1_ANTIALIAS_MODE_PER_PRIMITIVE;
}
}
static inline D2D1_MATRIX_3X2_F D2DMatrix(const Matrix &aTransform)
{
return D2D1::Matrix3x2F(aTransform._11, aTransform._12,
aTransform._21, aTransform._22,
aTransform._31, aTransform._32);
}
static inline D2D1_COLOR_F D2DColor(const Color &aColor)
{
return D2D1::ColorF(aColor.r, aColor.g, aColor.b, aColor.a);
}
static inline IntSize ToIntSize(const D2D1_SIZE_U &aSize)
{
return IntSize(aSize.width, aSize.height);
}
static inline SurfaceFormat ToPixelFormat(const D2D1_PIXEL_FORMAT &aFormat)
{
switch(aFormat.format) {
case DXGI_FORMAT_A8_UNORM:
return FORMAT_A8;
case DXGI_FORMAT_B8G8R8A8_UNORM:
if (aFormat.alphaMode == D2D1_ALPHA_MODE_IGNORE) {
return FORMAT_B8G8R8X8;
} else {
return FORMAT_B8G8R8A8;
}
default:
return FORMAT_B8G8R8A8;
}
}
static inline Rect ToRect(const D2D1_RECT_F &aRect)
{
return Rect(aRect.left, aRect.top, aRect.right - aRect.left, aRect.bottom - aRect.top);
}
static inline DXGI_FORMAT DXGIFormat(SurfaceFormat aFormat)
{
switch (aFormat) {
case FORMAT_B8G8R8A8:
return DXGI_FORMAT_B8G8R8A8_UNORM;
case FORMAT_B8G8R8X8:
return DXGI_FORMAT_B8G8R8A8_UNORM;
case FORMAT_A8:
return DXGI_FORMAT_A8_UNORM;
default:
return DXGI_FORMAT_UNKNOWN;
}
}
static inline D2D1_ALPHA_MODE AlphaMode(SurfaceFormat aFormat)
{
switch (aFormat) {
case FORMAT_B8G8R8X8:
return D2D1_ALPHA_MODE_IGNORE;
default:
return D2D1_ALPHA_MODE_PREMULTIPLIED;
}
}
static inline D2D1_PIXEL_FORMAT D2DPixelFormat(SurfaceFormat aFormat)
{
return D2D1::PixelFormat(DXGIFormat(aFormat), AlphaMode(aFormat));
}
static inline bool IsPatternSupportedByD2D(const Pattern &aPattern)
{
if (aPattern.GetType() != PATTERN_RADIAL_GRADIENT) {
return false;
}
const RadialGradientPattern *pat =
static_cast<const RadialGradientPattern*>(&aPattern);
if (pat->mRadius1 != 0) {
return true;
}
Point diff = pat->mCenter2 - pat->mCenter1;
if (sqrt(diff.x * diff.x + diff.y * diff.y) >= pat->mRadius2) {
// Inner point lies outside the circle.
return true;
}
return false;
}
/**
* This structure is used to pass rectangles to our shader constant. We can use
* this for passing rectangular areas to SetVertexShaderConstant. In the format
* of a 4 component float(x,y,width,height). Our vertex shader can then use
* this to construct rectangular positions from the 0,0-1,1 quad that we source
* it with.
*/
struct ShaderConstantRectD3D10
{
float mX, mY, mWidth, mHeight;
ShaderConstantRectD3D10(float aX, float aY, float aWidth, float aHeight)
: mX(aX), mY(aY), mWidth(aWidth), mHeight(aHeight)
{ }
// For easy passing to SetVertexShaderConstantF.
operator float* () { return &mX; }
};
static inline DWRITE_MATRIX
DWriteMatrixFromMatrix(Matrix &aMatrix)
{
DWRITE_MATRIX mat;
mat.m11 = aMatrix._11;
mat.m12 = aMatrix._12;
mat.m21 = aMatrix._21;
mat.m22 = aMatrix._22;
mat.dx = aMatrix._31;
mat.dy = aMatrix._32;
return mat;
}
class AutoDWriteGlyphRun : public DWRITE_GLYPH_RUN
{
static const unsigned kNumAutoGlyphs = 256;
public:
AutoDWriteGlyphRun() {
glyphCount = 0;
}
~AutoDWriteGlyphRun() {
if (glyphCount > kNumAutoGlyphs) {
delete[] glyphIndices;
delete[] glyphAdvances;
delete[] glyphOffsets;
}
}
void allocate(unsigned aNumGlyphs) {
glyphCount = aNumGlyphs;
if (aNumGlyphs <= kNumAutoGlyphs) {
glyphIndices = &mAutoIndices[0];
glyphAdvances = &mAutoAdvances[0];
glyphOffsets = &mAutoOffsets[0];
} else {
glyphIndices = new UINT16[aNumGlyphs];
glyphAdvances = new FLOAT[aNumGlyphs];
glyphOffsets = new DWRITE_GLYPH_OFFSET[aNumGlyphs];
}
}
private:
DWRITE_GLYPH_OFFSET mAutoOffsets[kNumAutoGlyphs];
FLOAT mAutoAdvances[kNumAutoGlyphs];
UINT16 mAutoIndices[kNumAutoGlyphs];
};
static inline void
DWriteGlyphRunFromGlyphs(const GlyphBuffer &aGlyphs, ScaledFontDWrite *aFont, AutoDWriteGlyphRun *run)
{
run->allocate(aGlyphs.mNumGlyphs);
FLOAT *advances = const_cast<FLOAT*>(run->glyphAdvances);
UINT16 *indices = const_cast<UINT16*>(run->glyphIndices);
DWRITE_GLYPH_OFFSET *offsets = const_cast<DWRITE_GLYPH_OFFSET*>(run->glyphOffsets);
memset(advances, 0, sizeof(FLOAT) * aGlyphs.mNumGlyphs);
for (unsigned int i = 0; i < aGlyphs.mNumGlyphs; i++) {
indices[i] = aGlyphs.mGlyphs[i].mIndex;
offsets[i].advanceOffset = aGlyphs.mGlyphs[i].mPosition.x;
offsets[i].ascenderOffset = -aGlyphs.mGlyphs[i].mPosition.y;
}
run->bidiLevel = 0;
run->fontFace = aFont->mFontFace;
run->fontEmSize = aFont->mSize;
run->glyphCount = aGlyphs.mNumGlyphs;
run->isSideways = FALSE;
}
}
}
#endif /* MOZILLA_GFX_HELPERSD2D_H_ */