diff -r 000000000000 -r 6474c204b198 layout/svg/nsSVGMaskFrame.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/layout/svg/nsSVGMaskFrame.cpp Wed Dec 31 06:09:35 2014 +0100 @@ -0,0 +1,320 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */ + +// Main header first: +#include "nsSVGMaskFrame.h" + +// Keep others in (case-insensitive) order: +#include "gfxContext.h" +#include "gfxImageSurface.h" +#include "nsRenderingContext.h" +#include "nsSVGEffects.h" +#include "mozilla/dom/SVGMaskElement.h" + +using namespace mozilla::dom; + +/** + * Byte offsets of channels in a native packed gfxColor or cairo image surface. + */ +#ifdef IS_BIG_ENDIAN +#define GFX_ARGB32_OFFSET_A 0 +#define GFX_ARGB32_OFFSET_R 1 +#define GFX_ARGB32_OFFSET_G 2 +#define GFX_ARGB32_OFFSET_B 3 +#else +#define GFX_ARGB32_OFFSET_A 3 +#define GFX_ARGB32_OFFSET_R 2 +#define GFX_ARGB32_OFFSET_G 1 +#define GFX_ARGB32_OFFSET_B 0 +#endif + +// c = n / 255 +// c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5 +static const uint8_t gsRGBToLinearRGBMap[256] = { + 0, 0, 0, 0, 0, 0, 0, 1, + 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 2, 2, 2, 2, 2, 2, + 2, 2, 3, 3, 3, 3, 3, 3, + 4, 4, 4, 4, 4, 5, 5, 5, + 5, 6, 6, 6, 6, 7, 7, 7, + 8, 8, 8, 8, 9, 9, 9, 10, + 10, 10, 11, 11, 12, 12, 12, 13, + 13, 13, 14, 14, 15, 15, 16, 16, + 17, 17, 17, 18, 18, 19, 19, 20, + 20, 21, 22, 22, 23, 23, 24, 24, + 25, 25, 26, 27, 27, 28, 29, 29, + 30, 30, 31, 32, 32, 33, 34, 35, + 35, 36, 37, 37, 38, 39, 40, 41, + 41, 42, 43, 44, 45, 45, 46, 47, + 48, 49, 50, 51, 51, 52, 53, 54, + 55, 56, 57, 58, 59, 60, 61, 62, + 63, 64, 65, 66, 67, 68, 69, 70, + 71, 72, 73, 74, 76, 77, 78, 79, + 80, 81, 82, 84, 85, 86, 87, 88, + 90, 91, 92, 93, 95, 96, 97, 99, +100, 101, 103, 104, 105, 107, 108, 109, +111, 112, 114, 115, 116, 118, 119, 121, +122, 124, 125, 127, 128, 130, 131, 133, +134, 136, 138, 139, 141, 142, 144, 146, +147, 149, 151, 152, 154, 156, 157, 159, +161, 163, 164, 166, 168, 170, 171, 173, +175, 177, 179, 181, 183, 184, 186, 188, +190, 192, 194, 196, 198, 200, 202, 204, +206, 208, 210, 212, 214, 216, 218, 220, +222, 224, 226, 229, 231, 233, 235, 237, +239, 242, 244, 246, 248, 250, 253, 255 +}; + +static void +ComputesRGBLuminanceMask(uint8_t *aData, + int32_t aStride, + const nsIntRect &aRect, + float aOpacity) +{ + for (int32_t y = aRect.y; y < aRect.YMost(); y++) { + for (int32_t x = aRect.x; x < aRect.XMost(); x++) { + uint8_t *pixel = aData + aStride * y + 4 * x; + uint8_t a = pixel[GFX_ARGB32_OFFSET_A]; + + uint8_t luminance; + if (a) { + /* sRGB -> intensity (unpremultiply cancels out the + * (a/255.0) multiplication with aOpacity */ + luminance = + static_cast + ((pixel[GFX_ARGB32_OFFSET_R] * 0.2125 + + pixel[GFX_ARGB32_OFFSET_G] * 0.7154 + + pixel[GFX_ARGB32_OFFSET_B] * 0.0721) * + aOpacity); + } else { + luminance = 0; + } + memset(pixel, luminance, 4); + } + } +} + +static void +ComputeLinearRGBLuminanceMask(uint8_t *aData, + int32_t aStride, + const nsIntRect &aRect, + float aOpacity) +{ + for (int32_t y = aRect.y; y < aRect.YMost(); y++) { + for (int32_t x = aRect.x; x < aRect.XMost(); x++) { + uint8_t *pixel = aData + aStride * y + 4 * x; + uint8_t a = pixel[GFX_ARGB32_OFFSET_A]; + + uint8_t luminance; + // unpremultiply + if (a) { + if (a != 255) { + pixel[GFX_ARGB32_OFFSET_B] = + (255 * pixel[GFX_ARGB32_OFFSET_B]) / a; + pixel[GFX_ARGB32_OFFSET_G] = + (255 * pixel[GFX_ARGB32_OFFSET_G]) / a; + pixel[GFX_ARGB32_OFFSET_R] = + (255 * pixel[GFX_ARGB32_OFFSET_R]) / a; + } + + /* sRGB -> linearRGB -> intensity */ + luminance = + static_cast + ((gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]] * + 0.2125 + + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]] * + 0.7154 + + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]] * + 0.0721) * (a / 255.0) * aOpacity); + } else { + luminance = 0; + } + memset(pixel, luminance, 4); + } + } +} + +static void +ComputeAlphaMask(uint8_t *aData, + int32_t aStride, + const nsIntRect &aRect, + float aOpacity) +{ + for (int32_t y = aRect.y; y < aRect.YMost(); y++) { + for (int32_t x = aRect.x; x < aRect.XMost(); x++) { + uint8_t *pixel = aData + aStride * y + 4 * x; + uint8_t luminance = pixel[GFX_ARGB32_OFFSET_A] * aOpacity; + memset(pixel, luminance, 4); + } + } +} + +//---------------------------------------------------------------------- +// Implementation + +nsIFrame* +NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) +{ + return new (aPresShell) nsSVGMaskFrame(aContext); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsSVGMaskFrame) + +already_AddRefed +nsSVGMaskFrame::ComputeMaskAlpha(nsRenderingContext *aContext, + nsIFrame* aParent, + const gfxMatrix &aMatrix, + float aOpacity) +{ + // If the flag is set when we get here, it means this mask frame + // has already been used painting the current mask, and the document + // has a mask reference loop. + if (mInUse) { + NS_WARNING("Mask loop detected!"); + return nullptr; + } + AutoMaskReferencer maskRef(this); + + SVGMaskElement *mask = static_cast(mContent); + + uint16_t units = + mask->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue(); + gfxRect bbox; + if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) { + bbox = nsSVGUtils::GetBBox(aParent); + } + + gfxRect maskArea = nsSVGUtils::GetRelativeRect(units, + &mask->mLengthAttributes[SVGMaskElement::ATTR_X], bbox, aParent); + + gfxContext *gfx = aContext->ThebesContext(); + + // Get the clip extents in device space: + gfx->Save(); + nsSVGUtils::SetClipRect(gfx, aMatrix, maskArea); + gfx->IdentityMatrix(); + gfxRect clipExtents = gfx->GetClipExtents(); + clipExtents.RoundOut(); + gfx->Restore(); + + bool resultOverflows; + gfxIntSize surfaceSize = + nsSVGUtils::ConvertToSurfaceSize(gfxSize(clipExtents.Width(), + clipExtents.Height()), + &resultOverflows); + + // 0 disables mask, < 0 is an error + if (surfaceSize.width <= 0 || surfaceSize.height <= 0) + return nullptr; + + if (resultOverflows) + return nullptr; + + nsRefPtr image = + new gfxImageSurface(surfaceSize, gfxImageFormat::ARGB32); + if (!image || image->CairoStatus()) + return nullptr; + + // We would like to use gfxImageSurface::SetDeviceOffset() to position + // 'image'. However, we need to set the same matrix on the temporary context + // and pattern that we create below as is currently set on 'gfx'. + // Unfortunately, any device offset set by SetDeviceOffset() is affected by + // the transform passed to the SetMatrix() calls, so to avoid that we account + // for the device offset in the transform rather than use SetDeviceOffset(). + gfxMatrix matrix = + gfx->CurrentMatrix() * gfxMatrix().Translate(-clipExtents.TopLeft()); + + nsRefPtr tmpCtx(new nsRenderingContext); + tmpCtx->Init(this->PresContext()->DeviceContext(), image); + tmpCtx->ThebesContext()->SetMatrix(matrix); + + mMaskParent = aParent; + if (mMaskParentMatrix) { + *mMaskParentMatrix = aMatrix; + } else { + mMaskParentMatrix = new gfxMatrix(aMatrix); + } + + for (nsIFrame* kid = mFrames.FirstChild(); kid; + kid = kid->GetNextSibling()) { + // The CTM of each frame referencing us can be different + nsISVGChildFrame* SVGFrame = do_QueryFrame(kid); + if (SVGFrame) { + SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED); + } + nsSVGUtils::PaintFrameWithEffects(tmpCtx, nullptr, kid); + } + + uint8_t *data = image->Data(); + int32_t stride = image->Stride(); + nsIntRect rect(0, 0, surfaceSize.width, surfaceSize.height); + + if (StyleSVGReset()->mMaskType == NS_STYLE_MASK_TYPE_LUMINANCE) { + if (StyleSVG()->mColorInterpolation == + NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) { + ComputeLinearRGBLuminanceMask(data, stride, rect, aOpacity); + } else { + ComputesRGBLuminanceMask(data, stride, rect, aOpacity); + } + } else { + ComputeAlphaMask(data, stride, rect, aOpacity); + } + + nsRefPtr retval = new gfxPattern(image); + retval->SetMatrix(matrix); + return retval.forget(); +} + +nsresult +nsSVGMaskFrame::AttributeChanged(int32_t aNameSpaceID, + nsIAtom* aAttribute, + int32_t aModType) +{ + if (aNameSpaceID == kNameSpaceID_None && + (aAttribute == nsGkAtoms::x || + aAttribute == nsGkAtoms::y || + aAttribute == nsGkAtoms::width || + aAttribute == nsGkAtoms::height|| + aAttribute == nsGkAtoms::maskUnits || + aAttribute == nsGkAtoms::maskContentUnits)) { + nsSVGEffects::InvalidateDirectRenderingObservers(this); + } + + return nsSVGMaskFrameBase::AttributeChanged(aNameSpaceID, + aAttribute, aModType); +} + +#ifdef DEBUG +void +nsSVGMaskFrame::Init(nsIContent* aContent, + nsIFrame* aParent, + nsIFrame* aPrevInFlow) +{ + NS_ASSERTION(aContent->IsSVG(nsGkAtoms::mask), + "Content is not an SVG mask"); + + nsSVGMaskFrameBase::Init(aContent, aParent, aPrevInFlow); +} +#endif /* DEBUG */ + +nsIAtom * +nsSVGMaskFrame::GetType() const +{ + return nsGkAtoms::svgMaskFrame; +} + +gfxMatrix +nsSVGMaskFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot) +{ + NS_ASSERTION(mMaskParentMatrix, "null parent matrix"); + + SVGMaskElement *mask = static_cast(mContent); + + return nsSVGUtils::AdjustMatrixForUnits( + mMaskParentMatrix ? *mMaskParentMatrix : gfxMatrix(), + &mask->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS], + mMaskParent); +} +