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337 lines
10 KiB
C++
337 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 "gfx2DGlue.h"
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#include "gfxContext.h"
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#include "mozilla/gfx/2D.h"
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#include "mozilla/RefPtr.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;
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using namespace mozilla::dom;
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using namespace mozilla::gfx;
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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 IntSize &aSize,
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float aOpacity)
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{
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for (int32_t y = 0; y < aSize.height; y++) {
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for (int32_t x = 0; x < aSize.width; 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 IntSize &aSize,
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float aOpacity)
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{
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for (int32_t y = 0; y < aSize.height; y++) {
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for (int32_t x = 0; x < aSize.width; 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 IntSize &aSize,
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float aOpacity)
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{
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for (int32_t y = 0; y < aSize.height; y++) {
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for (int32_t x = 0; x < aSize.width; 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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TemporaryRef<SourceSurface>
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nsSVGMaskFrame::GetMaskForMaskedFrame(gfxContext* aContext,
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nsIFrame* aMaskedFrame,
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const gfxMatrix &aMatrix,
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float aOpacity,
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Matrix* aMaskTransform)
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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 *maskElem = static_cast<SVGMaskElement*>(mContent);
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uint16_t units =
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maskElem->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(aMaskedFrame);
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}
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// Bounds in the user space of aMaskedFrame
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gfxRect maskArea = nsSVGUtils::GetRelativeRect(units,
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&maskElem->mLengthAttributes[SVGMaskElement::ATTR_X],
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bbox, aMaskedFrame);
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// Get the clip extents in device space:
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// Minimizing the mask surface extents (using both the current clip extents
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// and maskArea) is important for performance.
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aContext->Save();
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nsSVGUtils::SetClipRect(aContext, aMatrix, maskArea);
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aContext->SetMatrix(gfxMatrix());
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gfxRect maskSurfaceRect = aContext->GetClipExtents();
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maskSurfaceRect.RoundOut();
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aContext->Restore();
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bool resultOverflows;
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IntSize maskSurfaceSize =
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ToIntSize(nsSVGUtils::ConvertToSurfaceSize(maskSurfaceRect.Size(),
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&resultOverflows));
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if (resultOverflows || maskSurfaceSize.IsEmpty()) {
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// XXXjwatt we should return an empty surface so we don't paint aMaskedFrame!
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return nullptr;
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}
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RefPtr<DrawTarget> maskDT =
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Factory::CreateDrawTarget(BackendType::CAIRO, maskSurfaceSize,
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SurfaceFormat::B8G8R8A8);
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if (!maskDT) {
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return nullptr;
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}
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gfxMatrix maskSurfaceMatrix =
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aContext->CurrentMatrix() * gfxMatrix::Translation(-maskSurfaceRect.TopLeft());
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nsRefPtr<nsRenderingContext> tmpCtx = new nsRenderingContext();
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tmpCtx->Init(maskDT);
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tmpCtx->ThebesContext()->SetMatrix(maskSurfaceMatrix);
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mMatrixForChildren = GetMaskTransform(aMaskedFrame) * aMatrix;
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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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gfxMatrix m = mMatrixForChildren;
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if (kid->GetContent()->IsSVG()) {
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m = static_cast<nsSVGElement*>(kid->GetContent())->
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PrependLocalTransformsTo(m);
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}
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nsSVGUtils::PaintFrameWithEffects(kid, tmpCtx, mMatrixForChildren);
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}
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RefPtr<SourceSurface> maskSnapshot = maskDT->Snapshot();
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if (!maskSnapshot) {
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return nullptr;
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}
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RefPtr<DataSourceSurface> maskSurface = maskSnapshot->GetDataSurface();
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DataSourceSurface::MappedSurface map;
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if (!maskSurface->Map(DataSourceSurface::MapType::READ_WRITE, &map)) {
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return nullptr;
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}
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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(map.mData, map.mStride, maskSurfaceSize, aOpacity);
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} else {
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ComputesRGBLuminanceMask(map.mData, map.mStride, maskSurfaceSize, aOpacity);
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}
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} else {
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ComputeAlphaMask(map.mData, map.mStride, maskSurfaceSize, aOpacity);
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}
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maskSurface->Unmap();
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// Moz2D transforms in the opposite direction to Thebes
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if (!maskSurfaceMatrix.Invert()) {
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return nullptr;
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}
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*aMaskTransform = ToMatrix(maskSurfaceMatrix);
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return maskSurface;
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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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nsContainerFrame* 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()
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{
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return mMatrixForChildren;
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}
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gfxMatrix
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nsSVGMaskFrame::GetMaskTransform(nsIFrame* aMaskedFrame)
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{
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SVGMaskElement *content = static_cast<SVGMaskElement*>(mContent);
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nsSVGEnum* maskContentUnits =
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&content->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS];
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return nsSVGUtils::AdjustMatrixForUnits(gfxMatrix(), maskContentUnits,
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aMaskedFrame);
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}
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