зеркало из https://github.com/mozilla/gecko-dev.git
266 строки
8.7 KiB
C++
266 строки
8.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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// vim:cindent:ts=2:et:sw=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 NS_CSS_RENDERING_BORDERS_H
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#define NS_CSS_RENDERING_BORDERS_H
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#include "gfxRect.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/gfx/PathHelpers.h"
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#include "mozilla/RefPtr.h"
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#include "nsColor.h"
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#include "nsCOMPtr.h"
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#include "nsStyleConsts.h"
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#include "nsPresContext.h"
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struct nsBorderColors;
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namespace mozilla {
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namespace gfx {
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class GradientStops;
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} // namespace gfx
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} // namespace mozilla
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// define this to enable a bunch of debug dump info
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#undef DEBUG_NEW_BORDERS
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/*
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* Helper class that handles border rendering.
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*
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* aDrawTarget -- the DrawTarget to which the border should be rendered
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* outsideRect -- the rectangle on the outer edge of the border
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*
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* For any parameter where an array of side values is passed in,
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* they are in top, right, bottom, left order.
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*
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* borderStyles -- one border style enum per side
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* borderWidths -- one border width per side
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* borderRadii -- a RectCornerRadii struct describing the w/h for each rounded corner.
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* If the corner doesn't have a border radius, 0,0 should be given for it.
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* borderColors -- one nscolor per side
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* compositeColors -- a pointer to an array of composite color structs, or
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* nullptr if none.
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*
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* skipSides -- a bit mask specifying which sides, if any, to skip
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* backgroundColor -- the background color of the element.
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* Used in calculating colors for 2-tone borders, such as inset and outset
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* gapRect - a rectangle that should be clipped out to leave a gap in a border,
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* or nullptr if none.
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*/
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typedef enum {
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BorderColorStyleNone,
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BorderColorStyleSolid,
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BorderColorStyleLight,
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BorderColorStyleDark
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} BorderColorStyle;
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class nsCSSBorderRenderer final
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{
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typedef mozilla::gfx::ColorPattern ColorPattern;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::Float Float;
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typedef mozilla::gfx::Path Path;
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typedef mozilla::gfx::Rect Rect;
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typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
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public:
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nsCSSBorderRenderer(nsPresContext::nsPresContextType aPresContextType,
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DrawTarget* aDrawTarget,
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Rect& aOuterRect,
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const uint8_t* aBorderStyles,
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const Float* aBorderWidths,
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RectCornerRadii& aBorderRadii,
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const nscolor* aBorderColors,
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nsBorderColors* const* aCompositeColors,
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nscolor aBackgroundColor);
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// draw the entire border
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void DrawBorders();
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// utility function used for background painting as well as borders
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static void ComputeInnerRadii(const RectCornerRadii& aRadii,
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const Float* aBorderSizes,
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RectCornerRadii* aInnerRadiiRet);
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// Given aRadii as the border radii for a rectangle, compute the
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// appropriate radii for another rectangle *outside* that rectangle
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// by increasing the radii, except keeping sharp corners sharp.
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// Used for spread box-shadows
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static void ComputeOuterRadii(const RectCornerRadii& aRadii,
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const Float* aBorderSizes,
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RectCornerRadii* aOuterRadiiRet);
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private:
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RectCornerRadii mBorderCornerDimensions;
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// the PresContext type
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nsPresContext::nsPresContextType mPresContextType;
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// destination DrawTarget
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DrawTarget* mDrawTarget;
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// the rectangle of the outside and the inside of the border
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Rect mOuterRect;
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Rect mInnerRect;
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// the style and size of the border
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const uint8_t* mBorderStyles;
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const Float* mBorderWidths;
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RectCornerRadii mBorderRadii;
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// colors
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const nscolor* mBorderColors;
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nsBorderColors* const* mCompositeColors;
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// the background color
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nscolor mBackgroundColor;
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// calculated values
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bool mOneUnitBorder;
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bool mNoBorderRadius;
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bool mAvoidStroke;
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// For all the sides in the bitmask, would they be rendered
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// in an identical color and style?
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bool AreBorderSideFinalStylesSame(uint8_t aSides);
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// For the given style, is the given corner a solid color?
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bool IsSolidCornerStyle(uint8_t aStyle, mozilla::css::Corner aCorner);
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// For the given solid corner, what color style should be used?
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BorderColorStyle BorderColorStyleForSolidCorner(uint8_t aStyle, mozilla::css::Corner aCorner);
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//
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// Path generation functions
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//
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// Get the Rect for drawing the given corner
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Rect GetCornerRect(mozilla::css::Corner aCorner);
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// add the path for drawing the given side without any adjacent corners to the context
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Rect GetSideClipWithoutCornersRect(mozilla::css::Side aSide);
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// Create a clip path for the wedge that this side of
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// the border should take up. This is only called
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// when we're drawing separate border sides, so we know
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// that ADD compositing is taking place.
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//
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// This code needs to make sure that the individual pieces
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// don't ever (mathematically) overlap; the pixel overlap
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// is taken care of by the ADD compositing.
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already_AddRefed<Path> GetSideClipSubPath(mozilla::css::Side aSide);
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// Given a set of sides to fill and a color, do so in the fastest way.
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//
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// Stroke tends to be faster for smaller borders because it doesn't go
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// through the tessellator, which has initialization overhead. If
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// we're rendering all sides, we can use stroke at any thickness; we
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// also do TL/BR pairs at 1px thickness using stroke.
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//
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// If we can't stroke, then if it's a TL/BR pair, we use the specific
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// TL/BR paths. Otherwise, we do the full path and fill.
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//
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// Calling code is expected to only set up a clip as necessary; no
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// clip is needed if we can render the entire border in 1 or 2 passes.
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void FillSolidBorder(const Rect& aOuterRect,
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const Rect& aInnerRect,
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const RectCornerRadii& aBorderRadii,
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const Float* aBorderSizes,
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int aSides,
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const ColorPattern& aColor);
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//
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// core rendering
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//
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// draw the border for the given sides, using the style of the first side
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// present in the bitmask
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void DrawBorderSides (int aSides);
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// function used by the above to handle -moz-border-colors
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void DrawBorderSidesCompositeColors(int aSides, const nsBorderColors *compositeColors);
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// draw the given dashed side
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void DrawDashedSide (mozilla::css::Side aSide);
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// Setup the stroke style for a given side
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void SetupStrokeStyle(mozilla::css::Side aSize);
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// Analyze if all border sides have the same width.
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bool AllBordersSameWidth();
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// Analyze if all borders are 'solid' this also considers hidden or 'none'
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// borders because they can be considered 'solid' borders of 0 width and
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// with no color effect.
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bool AllBordersSolid(bool *aHasCompositeColors);
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// Draw a solid color border that is uniformly the same width.
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void DrawSingleWidthSolidBorder();
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// Draw any border which is solid on all sides and does not use
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// CompositeColors.
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void DrawNoCompositeColorSolidBorder();
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// Draw a solid border that has no border radius (i.e. is rectangular) and
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// uses CompositeColors.
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void DrawRectangularCompositeColors();
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};
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namespace mozilla {
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#ifdef DEBUG_NEW_BORDERS
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#include <stdarg.h>
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static inline void PrintAsString(const mozilla::gfx::Point& p) {
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fprintf (stderr, "[%f,%f]", p.x, p.y);
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}
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static inline void PrintAsString(const mozilla::gfx::Size& s) {
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fprintf (stderr, "[%f %f]", s.width, s.height);
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}
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static inline void PrintAsString(const mozilla::gfx::Rect& r) {
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fprintf (stderr, "[%f %f %f %f]", r.X(), r.Y(), r.Width(), r.Height());
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}
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static inline void PrintAsString(const mozilla::gfx::Float f) {
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fprintf (stderr, "%f", f);
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}
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static inline void PrintAsString(const char *s) {
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fprintf (stderr, "%s", s);
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}
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static inline void PrintAsStringNewline(const char *s = nullptr) {
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if (s)
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fprintf (stderr, "%s", s);
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fprintf (stderr, "\n");
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fflush (stderr);
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}
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static inline void PrintAsFormatString(const char *fmt, ...) {
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va_list vl;
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va_start(vl, fmt);
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vfprintf (stderr, fmt, vl);
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va_end(vl);
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}
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#else
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static inline void PrintAsString(const mozilla::gfx::Point& p) {}
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static inline void PrintAsString(const mozilla::gfx::Size& s) {}
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static inline void PrintAsString(const mozilla::gfx::Rect& r) {}
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static inline void PrintAsString(const mozilla::gfx::Float f) {}
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static inline void PrintAsString(const char *s) {}
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static inline void PrintAsStringNewline(const char *s = nullptr) {}
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static inline void PrintAsFormatString(const char *fmt, ...) {}
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#endif
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} // namespace mozilla
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#endif /* NS_CSS_RENDERING_BORDERS_H */
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