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