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