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/*
* Copyright (c) 2006,2007,2008, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "SkiaUtils.h"
#include "ImageBuffer.h"
#include "SharedBuffer.h"
#include "SkCanvas.h"
#include "SkColorPriv.h"
#include "SkMatrix.h"
#include "SkRegion.h"
namespace WebCore {
static const struct CompositOpToXfermodeMode {
uint8_t mCompositOp;
uint8_t m_xfermodeMode;
} gMapCompositOpsToXfermodeModes[] = {
{ CompositeClear, SkXfermode::kClear_Mode },
{ CompositeCopy, SkXfermode::kSrc_Mode },
{ CompositeSourceOver, SkXfermode::kSrcOver_Mode },
{ CompositeSourceIn, SkXfermode::kSrcIn_Mode },
{ CompositeSourceOut, SkXfermode::kSrcOut_Mode },
{ CompositeSourceAtop, SkXfermode::kSrcATop_Mode },
{ CompositeDestinationOver, SkXfermode::kDstOver_Mode },
{ CompositeDestinationIn, SkXfermode::kDstIn_Mode },
{ CompositeDestinationOut, SkXfermode::kDstOut_Mode },
{ CompositeDestinationAtop, SkXfermode::kDstATop_Mode },
{ CompositeXOR, SkXfermode::kXor_Mode },
{ CompositePlusDarker, SkXfermode::kDarken_Mode },
{ CompositePlusLighter, SkXfermode::kPlus_Mode }
};
SkXfermode::Mode WebCoreCompositeToSkiaComposite(CompositeOperator op)
{
const CompositOpToXfermodeMode* table = gMapCompositOpsToXfermodeModes;
for (unsigned i = 0; i < SK_ARRAY_COUNT(gMapCompositOpsToXfermodeModes); i++) {
if (table[i].mCompositOp == op)
return (SkXfermode::Mode)table[i].m_xfermodeMode;
}
SkDEBUGF(("GraphicsContext::setPlatformCompositeOperation unknown CompositeOperator %d\n", op));
return SkXfermode::kSrcOver_Mode; // fall-back
}
static U8CPU InvScaleByte(U8CPU component, uint32_t scale)
{
SkASSERT(component == (uint8_t)component);
return (component * scale + 0x8000) >> 16;
}
SkColor SkPMColorToColor(SkPMColor pm)
{
if (!pm)
return 0;
unsigned a = SkGetPackedA32(pm);
if (!a) {
// A zero alpha value when there are non-zero R, G, or B channels is an
// invalid premultiplied color (since all channels should have been
// multiplied by 0 if a=0).
SkASSERT(false);
// In production, return 0 to protect against division by zero.
return 0;
}
uint32_t scale = (255 << 16) / a;
return SkColorSetARGB(a,
InvScaleByte(SkGetPackedR32(pm), scale),
InvScaleByte(SkGetPackedG32(pm), scale),
InvScaleByte(SkGetPackedB32(pm), scale));
}
Color SkPMColorToWebCoreColor(SkPMColor pm)
{
return SkPMColorToColor(pm);
}
void ClipRectToCanvas(const PlatformContextSkia* context, const SkRect& srcRect, SkRect* destRect)
{
if (!context->getClipBounds(destRect) || !destRect->intersect(srcRect))
destRect->setEmpty();
}
bool SkPathContainsPoint(SkPath* originalPath, const FloatPoint& point, SkPath::FillType ft)
{
SkRect bounds = originalPath->getBounds();
// We can immediately return false if the point is outside the bounding
// rect. We don't use bounds.contains() here, since it would exclude
// points on the right and bottom edges of the bounding rect, and we want
// to include them.
SkScalar fX = SkFloatToScalar(point.x());
SkScalar fY = SkFloatToScalar(point.y());
if (fX < bounds.fLeft || fX > bounds.fRight || fY < bounds.fTop || fY > bounds.fBottom)
return false;
// Scale the path to a large size before hit testing for two reasons:
// 1) Skia has trouble with coordinates close to the max signed 16-bit values, so we scale larger paths down.
// TODO: when Skia is patched to work properly with large values, this will not be necessary.
// 2) Skia does not support analytic hit testing, so we scale paths up to do raster hit testing with subpixel accuracy.
SkScalar biggestCoord = std::max(std::max(std::max(bounds.fRight, bounds.fBottom), -bounds.fLeft), -bounds.fTop);
if (SkScalarNearlyZero(biggestCoord))
return false;
biggestCoord = std::max(std::max(biggestCoord, fX + 1), fY + 1);
const SkScalar kMaxCoordinate = SkIntToScalar(1 << 15);
SkScalar scale = SkScalarDiv(kMaxCoordinate, biggestCoord);
SkRegion rgn;
SkRegion clip;
SkMatrix m;
SkPath scaledPath;
SkPath::FillType originalFillType = originalPath->getFillType();
originalPath->setFillType(ft);
m.setScale(scale, scale);
originalPath->transform(m, &scaledPath);
int x = static_cast<int>(floorf(0.5f + point.x() * scale));
int y = static_cast<int>(floorf(0.5f + point.y() * scale));
clip.setRect(x - 1, y - 1, x + 1, y + 1);
bool contains = rgn.setPath(scaledPath, clip);
originalPath->setFillType(originalFillType);
return contains;
}
GraphicsContext* scratchContext()
{
static ImageBuffer* scratch = ImageBuffer::create(IntSize(1, 1)).leakPtr();
// We don't bother checking for failure creating the ImageBuffer, since our
// ImageBuffer initializer won't fail.
return scratch->context();
}
} // namespace WebCore
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