gecko-dev/layout/base/nsCSSRenderingBorders.h

266 строки
8.7 KiB
C++

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