mirror of
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291 lines
9.5 KiB
C++
291 lines
9.5 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 "nsColor.h"
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class gfxContext;
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class gfxPattern;
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struct gfxRGBA;
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namespace mozilla {
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namespace gfx {
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class GradientStops;
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}
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}
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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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//thickness of dashed line relative to dotted line
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#define DOT_LENGTH 1 //square
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#define DASH_LENGTH 3 //3 times longer than dot
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//some shorthand for side bits
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#define SIDE_BIT_TOP (1 << NS_SIDE_TOP)
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#define SIDE_BIT_RIGHT (1 << NS_SIDE_RIGHT)
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#define SIDE_BIT_BOTTOM (1 << NS_SIDE_BOTTOM)
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#define SIDE_BIT_LEFT (1 << NS_SIDE_LEFT)
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#define SIDE_BITS_ALL (SIDE_BIT_TOP|SIDE_BIT_RIGHT|SIDE_BIT_BOTTOM|SIDE_BIT_LEFT)
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#define C_TL NS_CORNER_TOP_LEFT
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#define C_TR NS_CORNER_TOP_RIGHT
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#define C_BR NS_CORNER_BOTTOM_RIGHT
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#define C_BL NS_CORNER_BOTTOM_LEFT
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/*
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* Helper class that handles border rendering.
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*
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* appUnitsPerPixel -- current value of AUPP
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* destContext -- the gfxContext 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 gfxCornerSizes 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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struct nsCSSBorderRenderer {
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nsCSSBorderRenderer(int32_t aAppUnitsPerPixel,
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gfxContext* aDestContext,
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gfxRect& aOuterRect,
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const uint8_t* aBorderStyles,
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const gfxFloat* aBorderWidths,
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gfxCornerSizes& 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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gfxCornerSizes mBorderCornerDimensions;
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// destination context
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gfxContext* mContext;
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// the rectangle of the outside and the inside of the border
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gfxRect mOuterRect;
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gfxRect 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 gfxFloat* mBorderWidths;
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uint8_t* mSanitizedStyles;
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gfxFloat* mSanitizedWidths;
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gfxCornerSizes mBorderRadii;
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// colors
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const nscolor* mBorderColors;
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nsBorderColors* const* mCompositeColors;
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// core app units per pixel
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int32_t mAUPP;
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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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// add the path for drawing the given corner to the context
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void DoCornerSubPath(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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void DoSideClipWithoutCornersSubPath(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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void DoSideClipSubPath(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 gfxRect& aOuterRect,
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const gfxRect& aInnerRect,
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const gfxCornerSizes& aBorderRadii,
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const gfxFloat *aBorderSizes,
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int aSides,
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const gfxRGBA& 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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// Create a gradient pattern that will handle the color transition for a
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// corner.
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already_AddRefed<gfxPattern> CreateCornerGradient(mozilla::css::Corner aCorner,
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const gfxRGBA &aFirstColor,
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const gfxRGBA &aSecondColor);
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// Azure variant of CreateCornerGradient.
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mozilla::TemporaryRef<mozilla::gfx::GradientStops>
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CreateCornerGradient(mozilla::css::Corner aCorner, const gfxRGBA &aFirstColor,
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const gfxRGBA &aSecondColor, mozilla::gfx::DrawTarget *aDT,
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mozilla::gfx::Point &aPoint1, mozilla::gfx::Point &aPoint2);
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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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// 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 gfxCornerSizes& aRadii,
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const gfxFloat *aBorderSizes,
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gfxCornerSizes *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 gfxCornerSizes& aRadii,
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const gfxFloat *aBorderSizes,
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gfxCornerSizes *aOuterRadiiRet);
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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 S(const gfxPoint& p) {
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fprintf (stderr, "[%f,%f]", p.x, p.y);
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}
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static inline void S(const gfxSize& s) {
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fprintf (stderr, "[%f %f]", s.width, s.height);
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}
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static inline void S(const gfxRect& r) {
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fprintf (stderr, "[%f %f %f %f]", r.pos.x, r.pos.y, r.size.width, r.size.height);
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}
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static inline void S(const gfxFloat f) {
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fprintf (stderr, "%f", f);
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}
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static inline void S(const char *s) {
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fprintf (stderr, "%s", s);
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}
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static inline void SN(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 SF(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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static inline void SX(gfxContext *ctx) {
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gfxPoint p = ctx->CurrentPoint();
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fprintf (stderr, "p: %f %f\n", p.x, p.y);
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return;
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ctx->MoveTo(p + gfxPoint(-2, -2)); ctx->LineTo(p + gfxPoint(2, 2));
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ctx->MoveTo(p + gfxPoint(-2, 2)); ctx->LineTo(p + gfxPoint(2, -2));
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ctx->MoveTo(p);
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}
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#else
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static inline void S(const gfxPoint& p) {}
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static inline void S(const gfxSize& s) {}
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static inline void S(const gfxRect& r) {}
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static inline void S(const gfxFloat f) {}
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static inline void S(const char *s) {}
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static inline void SN(const char *s = nullptr) {}
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static inline void SF(const char *fmt, ...) {}
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static inline void SX(gfxContext *ctx) {}
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#endif
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}
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#endif /* NS_CSS_RENDERING_BORDERS_H */
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