gecko-dev/gfx/2d/HelpersCairo.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_HELPERSCAIRO_H_
#define MOZILLA_GFX_HELPERSCAIRO_H_
#include "2D.h"
#include "cairo.h"
#include "Logging.h"
namespace mozilla {
namespace gfx {
static inline cairo_operator_t
GfxOpToCairoOp(CompositionOp op)
{
switch (op)
{
case CompositionOp::OP_OVER:
return CAIRO_OPERATOR_OVER;
case CompositionOp::OP_ADD:
return CAIRO_OPERATOR_ADD;
case CompositionOp::OP_ATOP:
return CAIRO_OPERATOR_ATOP;
case CompositionOp::OP_OUT:
return CAIRO_OPERATOR_OUT;
case CompositionOp::OP_IN:
return CAIRO_OPERATOR_IN;
case CompositionOp::OP_SOURCE:
return CAIRO_OPERATOR_SOURCE;
case CompositionOp::OP_DEST_IN:
return CAIRO_OPERATOR_DEST_IN;
case CompositionOp::OP_DEST_OUT:
return CAIRO_OPERATOR_DEST_OUT;
case CompositionOp::OP_DEST_OVER:
return CAIRO_OPERATOR_DEST_OVER;
case CompositionOp::OP_DEST_ATOP:
return CAIRO_OPERATOR_DEST_ATOP;
case CompositionOp::OP_XOR:
return CAIRO_OPERATOR_XOR;
case CompositionOp::OP_MULTIPLY:
return CAIRO_OPERATOR_MULTIPLY;
case CompositionOp::OP_SCREEN:
return CAIRO_OPERATOR_SCREEN;
case CompositionOp::OP_OVERLAY:
return CAIRO_OPERATOR_OVERLAY;
case CompositionOp::OP_DARKEN:
return CAIRO_OPERATOR_DARKEN;
case CompositionOp::OP_LIGHTEN:
return CAIRO_OPERATOR_LIGHTEN;
case CompositionOp::OP_COLOR_DODGE:
return CAIRO_OPERATOR_COLOR_DODGE;
case CompositionOp::OP_COLOR_BURN:
return CAIRO_OPERATOR_COLOR_BURN;
case CompositionOp::OP_HARD_LIGHT:
return CAIRO_OPERATOR_HARD_LIGHT;
case CompositionOp::OP_SOFT_LIGHT:
return CAIRO_OPERATOR_SOFT_LIGHT;
case CompositionOp::OP_DIFFERENCE:
return CAIRO_OPERATOR_DIFFERENCE;
case CompositionOp::OP_EXCLUSION:
return CAIRO_OPERATOR_EXCLUSION;
case CompositionOp::OP_HUE:
return CAIRO_OPERATOR_HSL_HUE;
case CompositionOp::OP_SATURATION:
return CAIRO_OPERATOR_HSL_SATURATION;
case CompositionOp::OP_COLOR:
return CAIRO_OPERATOR_HSL_COLOR;
case CompositionOp::OP_LUMINOSITY:
return CAIRO_OPERATOR_HSL_LUMINOSITY;
case CompositionOp::OP_COUNT:
break;
}
return CAIRO_OPERATOR_OVER;
}
static inline cairo_antialias_t
GfxAntialiasToCairoAntialias(AntialiasMode antialias)
{
switch (antialias)
{
case AntialiasMode::NONE:
return CAIRO_ANTIALIAS_NONE;
case AntialiasMode::GRAY:
return CAIRO_ANTIALIAS_GRAY;
case AntialiasMode::SUBPIXEL:
return CAIRO_ANTIALIAS_SUBPIXEL;
case AntialiasMode::DEFAULT:
return CAIRO_ANTIALIAS_DEFAULT;
}
return CAIRO_ANTIALIAS_DEFAULT;
}
static inline cairo_filter_t
GfxFilterToCairoFilter(Filter filter)
{
switch (filter)
{
case Filter::GOOD:
return CAIRO_FILTER_GOOD;
case Filter::LINEAR:
return CAIRO_FILTER_BILINEAR;
case Filter::POINT:
return CAIRO_FILTER_NEAREST;
}
return CAIRO_FILTER_BILINEAR;
}
static inline cairo_extend_t
GfxExtendToCairoExtend(ExtendMode extend)
{
switch (extend)
{
case ExtendMode::CLAMP:
return CAIRO_EXTEND_PAD;
case ExtendMode::REPEAT:
return CAIRO_EXTEND_REPEAT;
case ExtendMode::REFLECT:
return CAIRO_EXTEND_REFLECT;
}
return CAIRO_EXTEND_PAD;
}
static inline cairo_format_t
GfxFormatToCairoFormat(SurfaceFormat format)
{
switch (format)
{
case SurfaceFormat::B8G8R8A8:
return CAIRO_FORMAT_ARGB32;
case SurfaceFormat::B8G8R8X8:
return CAIRO_FORMAT_RGB24;
case SurfaceFormat::A8:
return CAIRO_FORMAT_A8;
case SurfaceFormat::R5G6B5:
return CAIRO_FORMAT_RGB16_565;
default:
gfxCriticalError() << "Unknown image format " << (int)format;
return CAIRO_FORMAT_ARGB32;
}
}
static inline cairo_content_t
GfxFormatToCairoContent(SurfaceFormat format)
{
switch (format)
{
case SurfaceFormat::B8G8R8A8:
return CAIRO_CONTENT_COLOR_ALPHA;
case SurfaceFormat::B8G8R8X8:
case SurfaceFormat::R5G6B5: //fall through
return CAIRO_CONTENT_COLOR;
case SurfaceFormat::A8:
return CAIRO_CONTENT_ALPHA;
default:
gfxCriticalError() << "Unknown image content format " << (int)format;
return CAIRO_CONTENT_COLOR_ALPHA;
}
}
static inline cairo_line_join_t
GfxLineJoinToCairoLineJoin(JoinStyle style)
{
switch (style)
{
case JoinStyle::BEVEL:
return CAIRO_LINE_JOIN_BEVEL;
case JoinStyle::ROUND:
return CAIRO_LINE_JOIN_ROUND;
case JoinStyle::MITER:
return CAIRO_LINE_JOIN_MITER;
case JoinStyle::MITER_OR_BEVEL:
return CAIRO_LINE_JOIN_MITER;
}
return CAIRO_LINE_JOIN_MITER;
}
static inline cairo_line_cap_t
GfxLineCapToCairoLineCap(CapStyle style)
{
switch (style)
{
case CapStyle::BUTT:
return CAIRO_LINE_CAP_BUTT;
case CapStyle::ROUND:
return CAIRO_LINE_CAP_ROUND;
case CapStyle::SQUARE:
return CAIRO_LINE_CAP_SQUARE;
}
return CAIRO_LINE_CAP_BUTT;
}
static inline SurfaceFormat
CairoContentToGfxFormat(cairo_content_t content)
{
switch (content)
{
case CAIRO_CONTENT_COLOR_ALPHA:
return SurfaceFormat::B8G8R8A8;
case CAIRO_CONTENT_COLOR:
// BEWARE! format may be 565
return SurfaceFormat::B8G8R8X8;
case CAIRO_CONTENT_ALPHA:
return SurfaceFormat::A8;
}
return SurfaceFormat::B8G8R8A8;
}
static inline SurfaceFormat
CairoFormatToGfxFormat(cairo_format_t format)
{
switch (format) {
case CAIRO_FORMAT_ARGB32:
return SurfaceFormat::B8G8R8A8;
case CAIRO_FORMAT_RGB24:
return SurfaceFormat::B8G8R8X8;
case CAIRO_FORMAT_A8:
return SurfaceFormat::A8;
case CAIRO_FORMAT_RGB16_565:
return SurfaceFormat::R5G6B5;
default:
gfxCriticalError() << "Unknown cairo format " << format;
return SurfaceFormat::UNKNOWN;
}
}
SurfaceFormat GfxFormatForCairoSurface(cairo_surface_t* surface);
static inline void
GfxMatrixToCairoMatrix(const Matrix& mat, cairo_matrix_t& retval)
{
cairo_matrix_init(&retval, mat._11, mat._12, mat._21, mat._22, mat._31, mat._32);
}
static inline void
SetCairoStrokeOptions(cairo_t* aCtx, const StrokeOptions& aStrokeOptions)
{
cairo_set_line_width(aCtx, aStrokeOptions.mLineWidth);
cairo_set_miter_limit(aCtx, aStrokeOptions.mMiterLimit);
if (aStrokeOptions.mDashPattern) {
// Convert array of floats to array of doubles
std::vector<double> dashes(aStrokeOptions.mDashLength);
bool nonZero = false;
for (size_t i = 0; i < aStrokeOptions.mDashLength; ++i) {
if (aStrokeOptions.mDashPattern[i] != 0) {
nonZero = true;
}
dashes[i] = aStrokeOptions.mDashPattern[i];
}
// Avoid all-zero patterns that would trigger the CAIRO_STATUS_INVALID_DASH context error state.
if (nonZero) {
cairo_set_dash(aCtx, &dashes[0], aStrokeOptions.mDashLength,
aStrokeOptions.mDashOffset);
}
}
cairo_set_line_join(aCtx, GfxLineJoinToCairoLineJoin(aStrokeOptions.mLineJoin));
cairo_set_line_cap(aCtx, GfxLineCapToCairoLineCap(aStrokeOptions.mLineCap));
}
static inline cairo_fill_rule_t
GfxFillRuleToCairoFillRule(FillRule rule)
{
switch (rule)
{
case FillRule::FILL_WINDING:
return CAIRO_FILL_RULE_WINDING;
case FillRule::FILL_EVEN_ODD:
return CAIRO_FILL_RULE_EVEN_ODD;
}
return CAIRO_FILL_RULE_WINDING;
}
// RAII class for temporarily changing the cairo matrix transform. It will use
// the given matrix transform while it is in scope. When it goes out of scope
// it will put the cairo context back the way it was.
class CairoTempMatrix
{
public:
CairoTempMatrix(cairo_t* aCtx, const Matrix& aMatrix)
: mCtx(aCtx)
{
cairo_get_matrix(aCtx, &mSaveMatrix);
cairo_matrix_t matrix;
GfxMatrixToCairoMatrix(aMatrix, matrix);
cairo_set_matrix(aCtx, &matrix);
}
~CairoTempMatrix()
{
cairo_set_matrix(mCtx, &mSaveMatrix);
}
private:
cairo_t* mCtx;
cairo_matrix_t mSaveMatrix;
};
} // namespace gfx
} // namespace mozilla
#endif /* MOZILLA_GFX_HELPERSCAIRO_H_ */