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745 lines
25 KiB
C++
745 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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#include "Blur.h"
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#include <algorithm>
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#include <math.h>
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#include <string.h>
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#include "mozilla/CheckedInt.h"
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#include "mozilla/Constants.h"
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#include "2D.h"
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#include "DataSurfaceHelpers.h"
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#include "Tools.h"
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using namespace std;
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namespace mozilla {
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namespace gfx {
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/**
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* Box blur involves looking at one pixel, and setting its value to the average
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* of its neighbouring pixels.
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* @param aInput The input buffer.
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* @param aOutput The output buffer.
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* @param aLeftLobe The number of pixels to blend on the left.
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* @param aRightLobe The number of pixels to blend on the right.
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* @param aWidth The number of columns in the buffers.
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* @param aRows The number of rows in the buffers.
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* @param aSkipRect An area to skip blurring in.
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* XXX shouldn't we pass stride in separately here?
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*/
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static void
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BoxBlurHorizontal(unsigned char* aInput,
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unsigned char* aOutput,
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int32_t aLeftLobe,
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int32_t aRightLobe,
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int32_t aWidth,
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int32_t aRows,
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const IntRect& aSkipRect)
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{
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MOZ_ASSERT(aWidth > 0);
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int32_t boxSize = aLeftLobe + aRightLobe + 1;
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bool skipRectCoversWholeRow = 0 >= aSkipRect.x &&
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aWidth <= aSkipRect.XMost();
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if (boxSize == 1) {
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memcpy(aOutput, aInput, aWidth*aRows);
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return;
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}
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uint32_t reciprocal = uint32_t((uint64_t(1) << 32) / boxSize);
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for (int32_t y = 0; y < aRows; y++) {
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// Check whether the skip rect intersects this row. If the skip
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// rect covers the whole surface in this row, we can avoid
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// this row entirely (and any others along the skip rect).
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bool inSkipRectY = y >= aSkipRect.y &&
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y < aSkipRect.YMost();
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if (inSkipRectY && skipRectCoversWholeRow) {
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y = aSkipRect.YMost() - 1;
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continue;
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}
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uint32_t alphaSum = 0;
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for (int32_t i = 0; i < boxSize; i++) {
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int32_t pos = i - aLeftLobe;
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// See assertion above; if aWidth is zero, then we would have no
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// valid position to clamp to.
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pos = max(pos, 0);
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pos = min(pos, aWidth - 1);
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alphaSum += aInput[aWidth * y + pos];
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}
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for (int32_t x = 0; x < aWidth; x++) {
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// Check whether we are within the skip rect. If so, go
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// to the next point outside the skip rect.
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if (inSkipRectY && x >= aSkipRect.x &&
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x < aSkipRect.XMost()) {
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x = aSkipRect.XMost();
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if (x >= aWidth)
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break;
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// Recalculate the neighbouring alpha values for
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// our new point on the surface.
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alphaSum = 0;
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for (int32_t i = 0; i < boxSize; i++) {
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int32_t pos = x + i - aLeftLobe;
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// See assertion above; if aWidth is zero, then we would have no
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// valid position to clamp to.
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pos = max(pos, 0);
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pos = min(pos, aWidth - 1);
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alphaSum += aInput[aWidth * y + pos];
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}
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}
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int32_t tmp = x - aLeftLobe;
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int32_t last = max(tmp, 0);
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int32_t next = min(tmp + boxSize, aWidth - 1);
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aOutput[aWidth * y + x] = (uint64_t(alphaSum) * reciprocal) >> 32;
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alphaSum += aInput[aWidth * y + next] -
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aInput[aWidth * y + last];
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}
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}
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}
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/**
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* Identical to BoxBlurHorizontal, except it blurs top and bottom instead of
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* left and right.
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* XXX shouldn't we pass stride in separately here?
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*/
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static void
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BoxBlurVertical(unsigned char* aInput,
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unsigned char* aOutput,
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int32_t aTopLobe,
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int32_t aBottomLobe,
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int32_t aWidth,
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int32_t aRows,
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const IntRect& aSkipRect)
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{
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MOZ_ASSERT(aRows > 0);
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int32_t boxSize = aTopLobe + aBottomLobe + 1;
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bool skipRectCoversWholeColumn = 0 >= aSkipRect.y &&
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aRows <= aSkipRect.YMost();
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if (boxSize == 1) {
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memcpy(aOutput, aInput, aWidth*aRows);
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return;
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}
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uint32_t reciprocal = uint32_t((uint64_t(1) << 32) / boxSize);
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for (int32_t x = 0; x < aWidth; x++) {
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bool inSkipRectX = x >= aSkipRect.x &&
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x < aSkipRect.XMost();
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if (inSkipRectX && skipRectCoversWholeColumn) {
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x = aSkipRect.XMost() - 1;
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continue;
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}
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uint32_t alphaSum = 0;
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for (int32_t i = 0; i < boxSize; i++) {
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int32_t pos = i - aTopLobe;
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// See assertion above; if aRows is zero, then we would have no
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// valid position to clamp to.
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pos = max(pos, 0);
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pos = min(pos, aRows - 1);
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alphaSum += aInput[aWidth * pos + x];
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}
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for (int32_t y = 0; y < aRows; y++) {
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if (inSkipRectX && y >= aSkipRect.y &&
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y < aSkipRect.YMost()) {
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y = aSkipRect.YMost();
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if (y >= aRows)
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break;
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alphaSum = 0;
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for (int32_t i = 0; i < boxSize; i++) {
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int32_t pos = y + i - aTopLobe;
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// See assertion above; if aRows is zero, then we would have no
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// valid position to clamp to.
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pos = max(pos, 0);
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pos = min(pos, aRows - 1);
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alphaSum += aInput[aWidth * pos + x];
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}
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}
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int32_t tmp = y - aTopLobe;
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int32_t last = max(tmp, 0);
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int32_t next = min(tmp + boxSize, aRows - 1);
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aOutput[aWidth * y + x] = (uint64_t(alphaSum) * reciprocal) >> 32;
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alphaSum += aInput[aWidth * next + x] -
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aInput[aWidth * last + x];
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}
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}
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}
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static void ComputeLobes(int32_t aRadius, int32_t aLobes[3][2])
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{
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int32_t major, minor, final;
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/* See http://www.w3.org/TR/SVG/filters.html#feGaussianBlur for
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* some notes about approximating the Gaussian blur with box-blurs.
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* The comments below are in the terminology of that page.
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*/
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int32_t z = aRadius / 3;
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switch (aRadius % 3) {
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case 0:
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// aRadius = z*3; choose d = 2*z + 1
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major = minor = final = z;
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break;
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case 1:
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// aRadius = z*3 + 1
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// This is a tricky case since there is no value of d which will
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// yield a radius of exactly aRadius. If d is odd, i.e. d=2*k + 1
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// for some integer k, then the radius will be 3*k. If d is even,
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// i.e. d=2*k, then the radius will be 3*k - 1.
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// So we have to choose values that don't match the standard
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// algorithm.
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major = z + 1;
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minor = final = z;
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break;
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case 2:
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// aRadius = z*3 + 2; choose d = 2*z + 2
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major = final = z + 1;
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minor = z;
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break;
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default:
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// Mathematical impossibility!
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MOZ_ASSERT(false);
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major = minor = final = 0;
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}
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MOZ_ASSERT(major + minor + final == aRadius);
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aLobes[0][0] = major;
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aLobes[0][1] = minor;
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aLobes[1][0] = minor;
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aLobes[1][1] = major;
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aLobes[2][0] = final;
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aLobes[2][1] = final;
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}
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static void
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SpreadHorizontal(unsigned char* aInput,
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unsigned char* aOutput,
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int32_t aRadius,
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int32_t aWidth,
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int32_t aRows,
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int32_t aStride,
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const IntRect& aSkipRect)
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{
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if (aRadius == 0) {
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memcpy(aOutput, aInput, aStride * aRows);
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return;
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}
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bool skipRectCoversWholeRow = 0 >= aSkipRect.x &&
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aWidth <= aSkipRect.XMost();
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for (int32_t y = 0; y < aRows; y++) {
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// Check whether the skip rect intersects this row. If the skip
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// rect covers the whole surface in this row, we can avoid
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// this row entirely (and any others along the skip rect).
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bool inSkipRectY = y >= aSkipRect.y &&
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y < aSkipRect.YMost();
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if (inSkipRectY && skipRectCoversWholeRow) {
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y = aSkipRect.YMost() - 1;
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continue;
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}
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for (int32_t x = 0; x < aWidth; x++) {
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// Check whether we are within the skip rect. If so, go
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// to the next point outside the skip rect.
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if (inSkipRectY && x >= aSkipRect.x &&
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x < aSkipRect.XMost()) {
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x = aSkipRect.XMost();
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if (x >= aWidth)
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break;
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}
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int32_t sMin = max(x - aRadius, 0);
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int32_t sMax = min(x + aRadius, aWidth - 1);
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int32_t v = 0;
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for (int32_t s = sMin; s <= sMax; ++s) {
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v = max<int32_t>(v, aInput[aStride * y + s]);
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}
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aOutput[aStride * y + x] = v;
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}
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}
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}
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static void
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SpreadVertical(unsigned char* aInput,
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unsigned char* aOutput,
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int32_t aRadius,
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int32_t aWidth,
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int32_t aRows,
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int32_t aStride,
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const IntRect& aSkipRect)
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{
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if (aRadius == 0) {
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memcpy(aOutput, aInput, aStride * aRows);
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return;
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}
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bool skipRectCoversWholeColumn = 0 >= aSkipRect.y &&
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aRows <= aSkipRect.YMost();
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for (int32_t x = 0; x < aWidth; x++) {
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bool inSkipRectX = x >= aSkipRect.x &&
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x < aSkipRect.XMost();
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if (inSkipRectX && skipRectCoversWholeColumn) {
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x = aSkipRect.XMost() - 1;
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continue;
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}
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for (int32_t y = 0; y < aRows; y++) {
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// Check whether we are within the skip rect. If so, go
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// to the next point outside the skip rect.
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if (inSkipRectX && y >= aSkipRect.y &&
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y < aSkipRect.YMost()) {
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y = aSkipRect.YMost();
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if (y >= aRows)
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break;
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}
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int32_t sMin = max(y - aRadius, 0);
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int32_t sMax = min(y + aRadius, aRows - 1);
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int32_t v = 0;
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for (int32_t s = sMin; s <= sMax; ++s) {
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v = max<int32_t>(v, aInput[aStride * s + x]);
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}
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aOutput[aStride * y + x] = v;
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}
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}
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}
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CheckedInt<int32_t>
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AlphaBoxBlur::RoundUpToMultipleOf4(int32_t aVal)
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{
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CheckedInt<int32_t> val(aVal);
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val += 3;
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val /= 4;
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val *= 4;
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return val;
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}
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AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
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const IntSize& aSpreadRadius,
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const IntSize& aBlurRadius,
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const Rect* aDirtyRect,
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const Rect* aSkipRect)
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: mSpreadRadius(aSpreadRadius),
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mBlurRadius(aBlurRadius),
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mSurfaceAllocationSize(-1)
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{
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Rect rect(aRect);
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rect.Inflate(Size(aBlurRadius + aSpreadRadius));
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rect.RoundOut();
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if (aDirtyRect) {
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// If we get passed a dirty rect from layout, we can minimize the
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// shadow size and make painting faster.
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mHasDirtyRect = true;
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mDirtyRect = *aDirtyRect;
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Rect requiredBlurArea = mDirtyRect.Intersect(rect);
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requiredBlurArea.Inflate(Size(aBlurRadius + aSpreadRadius));
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rect = requiredBlurArea.Intersect(rect);
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} else {
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mHasDirtyRect = false;
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}
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mRect = IntRect(int32_t(rect.x), int32_t(rect.y),
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int32_t(rect.width), int32_t(rect.height));
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if (mRect.IsEmpty()) {
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return;
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}
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if (aSkipRect) {
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// If we get passed a skip rect, we can lower the amount of
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// blurring/spreading we need to do. We convert it to IntRect to avoid
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// expensive int<->float conversions if we were to use Rect instead.
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Rect skipRect = *aSkipRect;
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skipRect.RoundIn();
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skipRect.Deflate(Size(aBlurRadius + aSpreadRadius));
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mSkipRect = IntRect(int32_t(skipRect.x), int32_t(skipRect.y),
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int32_t(skipRect.width), int32_t(skipRect.height));
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mSkipRect = mSkipRect.Intersect(mRect);
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if (mSkipRect.IsEqualInterior(mRect))
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return;
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mSkipRect -= mRect.TopLeft();
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} else {
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mSkipRect = IntRect(0, 0, 0, 0);
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}
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CheckedInt<int32_t> stride = RoundUpToMultipleOf4(mRect.width);
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if (stride.isValid()) {
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mStride = stride.value();
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// We need to leave room for an additional 3 bytes for a potential overrun
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// in our blurring code.
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size_t size = BufferSizeFromStrideAndHeight(mStride, mRect.height, 3);
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if (size != 0) {
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mSurfaceAllocationSize = size;
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}
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}
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}
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AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
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int32_t aStride,
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float aSigmaX,
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float aSigmaY)
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: mRect(int32_t(aRect.x), int32_t(aRect.y),
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int32_t(aRect.width), int32_t(aRect.height)),
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mSpreadRadius(),
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mBlurRadius(CalculateBlurRadius(Point(aSigmaX, aSigmaY))),
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mStride(aStride),
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mSurfaceAllocationSize(-1)
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{
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IntRect intRect;
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if (aRect.ToIntRect(&intRect)) {
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size_t minDataSize = BufferSizeFromStrideAndHeight(intRect.width, intRect.height);
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if (minDataSize != 0) {
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mSurfaceAllocationSize = minDataSize;
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}
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}
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}
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AlphaBoxBlur::~AlphaBoxBlur()
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{
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}
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IntSize
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AlphaBoxBlur::GetSize()
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{
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IntSize size(mRect.width, mRect.height);
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return size;
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}
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int32_t
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AlphaBoxBlur::GetStride()
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{
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return mStride;
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}
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IntRect
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AlphaBoxBlur::GetRect()
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{
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return mRect;
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}
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Rect*
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AlphaBoxBlur::GetDirtyRect()
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{
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if (mHasDirtyRect) {
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return &mDirtyRect;
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}
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return nullptr;
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}
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int32_t
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AlphaBoxBlur::GetSurfaceAllocationSize() const
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{
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return mSurfaceAllocationSize;
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}
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void
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AlphaBoxBlur::Blur(uint8_t* aData)
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{
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if (!aData) {
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return;
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}
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// no need to do all this if not blurring or spreading
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if (mBlurRadius != IntSize(0,0) || mSpreadRadius != IntSize(0,0)) {
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int32_t stride = GetStride();
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IntSize size = GetSize();
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if (mSpreadRadius.width > 0 || mSpreadRadius.height > 0) {
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// No need to use CheckedInt here - we have validated it in the constructor.
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size_t szB = stride * size.height;
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unsigned char* tmpData = new (std::nothrow) uint8_t[szB];
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if (!tmpData) {
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return;
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}
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memset(tmpData, 0, szB);
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SpreadHorizontal(aData, tmpData, mSpreadRadius.width, GetSize().width, GetSize().height, stride, mSkipRect);
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SpreadVertical(tmpData, aData, mSpreadRadius.height, GetSize().width, GetSize().height, stride, mSkipRect);
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delete [] tmpData;
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}
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int32_t horizontalLobes[3][2];
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ComputeLobes(mBlurRadius.width, horizontalLobes);
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int32_t verticalLobes[3][2];
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ComputeLobes(mBlurRadius.height, verticalLobes);
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// We want to allow for some extra space on the left for alignment reasons.
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int32_t maxLeftLobe = RoundUpToMultipleOf4(horizontalLobes[0][0] + 1).value();
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IntSize integralImageSize(size.width + maxLeftLobe + horizontalLobes[1][1],
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size.height + verticalLobes[0][0] + verticalLobes[1][1] + 1);
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if ((integralImageSize.width * integralImageSize.height) > (1 << 24)) {
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// Fallback to old blurring code when the surface is so large it may
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// overflow our integral image!
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// No need to use CheckedInt here - we have validated it in the constructor.
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size_t szB = stride * size.height;
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uint8_t* tmpData = new (std::nothrow) uint8_t[szB];
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if (!tmpData) {
|
|
return;
|
|
}
|
|
|
|
memset(tmpData, 0, szB);
|
|
|
|
uint8_t* a = aData;
|
|
uint8_t* b = tmpData;
|
|
if (mBlurRadius.width > 0) {
|
|
BoxBlurHorizontal(a, b, horizontalLobes[0][0], horizontalLobes[0][1], stride, GetSize().height, mSkipRect);
|
|
BoxBlurHorizontal(b, a, horizontalLobes[1][0], horizontalLobes[1][1], stride, GetSize().height, mSkipRect);
|
|
BoxBlurHorizontal(a, b, horizontalLobes[2][0], horizontalLobes[2][1], stride, GetSize().height, mSkipRect);
|
|
} else {
|
|
a = tmpData;
|
|
b = aData;
|
|
}
|
|
// The result is in 'b' here.
|
|
if (mBlurRadius.height > 0) {
|
|
BoxBlurVertical(b, a, verticalLobes[0][0], verticalLobes[0][1], stride, GetSize().height, mSkipRect);
|
|
BoxBlurVertical(a, b, verticalLobes[1][0], verticalLobes[1][1], stride, GetSize().height, mSkipRect);
|
|
BoxBlurVertical(b, a, verticalLobes[2][0], verticalLobes[2][1], stride, GetSize().height, mSkipRect);
|
|
} else {
|
|
a = b;
|
|
}
|
|
// The result is in 'a' here.
|
|
if (a == tmpData) {
|
|
memcpy(aData, tmpData, szB);
|
|
}
|
|
delete [] tmpData;
|
|
} else {
|
|
size_t integralImageStride = GetAlignedStride<16>(integralImageSize.width * 4);
|
|
|
|
// We need to leave room for an additional 12 bytes for a maximum overrun
|
|
// of 3 pixels in the blurring code.
|
|
size_t bufLen = BufferSizeFromStrideAndHeight(integralImageStride, integralImageSize.height, 12);
|
|
if (bufLen == 0) {
|
|
return;
|
|
}
|
|
// bufLen is a byte count, but here we want a multiple of 32-bit ints, so
|
|
// we divide by 4.
|
|
AlignedArray<uint32_t> integralImage((bufLen / 4) + ((bufLen % 4) ? 1 : 0));
|
|
|
|
if (!integralImage) {
|
|
return;
|
|
}
|
|
#ifdef USE_SSE2
|
|
if (Factory::HasSSE2()) {
|
|
BoxBlur_SSE2(aData, horizontalLobes[0][0], horizontalLobes[0][1], verticalLobes[0][0],
|
|
verticalLobes[0][1], integralImage, integralImageStride);
|
|
BoxBlur_SSE2(aData, horizontalLobes[1][0], horizontalLobes[1][1], verticalLobes[1][0],
|
|
verticalLobes[1][1], integralImage, integralImageStride);
|
|
BoxBlur_SSE2(aData, horizontalLobes[2][0], horizontalLobes[2][1], verticalLobes[2][0],
|
|
verticalLobes[2][1], integralImage, integralImageStride);
|
|
} else
|
|
#endif
|
|
{
|
|
BoxBlur_C(aData, horizontalLobes[0][0], horizontalLobes[0][1], verticalLobes[0][0],
|
|
verticalLobes[0][1], integralImage, integralImageStride);
|
|
BoxBlur_C(aData, horizontalLobes[1][0], horizontalLobes[1][1], verticalLobes[1][0],
|
|
verticalLobes[1][1], integralImage, integralImageStride);
|
|
BoxBlur_C(aData, horizontalLobes[2][0], horizontalLobes[2][1], verticalLobes[2][0],
|
|
verticalLobes[2][1], integralImage, integralImageStride);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE void
|
|
GenerateIntegralRow(uint32_t *aDest, const uint8_t *aSource, uint32_t *aPreviousRow,
|
|
const uint32_t &aSourceWidth, const uint32_t &aLeftInflation, const uint32_t &aRightInflation)
|
|
{
|
|
uint32_t currentRowSum = 0;
|
|
uint32_t pixel = aSource[0];
|
|
for (uint32_t x = 0; x < aLeftInflation; x++) {
|
|
currentRowSum += pixel;
|
|
*aDest++ = currentRowSum + *aPreviousRow++;
|
|
}
|
|
for (uint32_t x = aLeftInflation; x < (aSourceWidth + aLeftInflation); x += 4) {
|
|
uint32_t alphaValues = *(uint32_t*)(aSource + (x - aLeftInflation));
|
|
#if defined WORDS_BIGENDIAN || defined IS_BIG_ENDIAN || defined __BIG_ENDIAN__
|
|
currentRowSum += (alphaValues >> 24) & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
currentRowSum += (alphaValues >> 16) & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
currentRowSum += (alphaValues >> 8) & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
currentRowSum += alphaValues & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
#else
|
|
currentRowSum += alphaValues & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
alphaValues >>= 8;
|
|
currentRowSum += alphaValues & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
alphaValues >>= 8;
|
|
currentRowSum += alphaValues & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
alphaValues >>= 8;
|
|
currentRowSum += alphaValues & 0xff;
|
|
*aDest++ = *aPreviousRow++ + currentRowSum;
|
|
#endif
|
|
}
|
|
pixel = aSource[aSourceWidth - 1];
|
|
for (uint32_t x = (aSourceWidth + aLeftInflation); x < (aSourceWidth + aLeftInflation + aRightInflation); x++) {
|
|
currentRowSum += pixel;
|
|
*aDest++ = currentRowSum + *aPreviousRow++;
|
|
}
|
|
}
|
|
|
|
MOZ_ALWAYS_INLINE void
|
|
GenerateIntegralImage_C(int32_t aLeftInflation, int32_t aRightInflation,
|
|
int32_t aTopInflation, int32_t aBottomInflation,
|
|
uint32_t *aIntegralImage, size_t aIntegralImageStride,
|
|
uint8_t *aSource, int32_t aSourceStride, const IntSize &aSize)
|
|
{
|
|
uint32_t stride32bit = aIntegralImageStride / 4;
|
|
|
|
IntSize integralImageSize(aSize.width + aLeftInflation + aRightInflation,
|
|
aSize.height + aTopInflation + aBottomInflation);
|
|
|
|
memset(aIntegralImage, 0, aIntegralImageStride);
|
|
|
|
GenerateIntegralRow(aIntegralImage, aSource, aIntegralImage,
|
|
aSize.width, aLeftInflation, aRightInflation);
|
|
for (int y = 1; y < aTopInflation + 1; y++) {
|
|
GenerateIntegralRow(aIntegralImage + (y * stride32bit), aSource, aIntegralImage + (y - 1) * stride32bit,
|
|
aSize.width, aLeftInflation, aRightInflation);
|
|
}
|
|
|
|
for (int y = aTopInflation + 1; y < (aSize.height + aTopInflation); y++) {
|
|
GenerateIntegralRow(aIntegralImage + (y * stride32bit), aSource + aSourceStride * (y - aTopInflation),
|
|
aIntegralImage + (y - 1) * stride32bit, aSize.width, aLeftInflation, aRightInflation);
|
|
}
|
|
|
|
if (aBottomInflation) {
|
|
for (int y = (aSize.height + aTopInflation); y < integralImageSize.height; y++) {
|
|
GenerateIntegralRow(aIntegralImage + (y * stride32bit), aSource + ((aSize.height - 1) * aSourceStride),
|
|
aIntegralImage + (y - 1) * stride32bit,
|
|
aSize.width, aLeftInflation, aRightInflation);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Attempt to do an in-place box blur using an integral image.
|
|
*/
|
|
void
|
|
AlphaBoxBlur::BoxBlur_C(uint8_t* aData,
|
|
int32_t aLeftLobe,
|
|
int32_t aRightLobe,
|
|
int32_t aTopLobe,
|
|
int32_t aBottomLobe,
|
|
uint32_t *aIntegralImage,
|
|
size_t aIntegralImageStride)
|
|
{
|
|
IntSize size = GetSize();
|
|
|
|
MOZ_ASSERT(size.width > 0);
|
|
|
|
// Our 'left' or 'top' lobe will include the current pixel. i.e. when
|
|
// looking at an integral image the value of a pixel at 'x,y' is calculated
|
|
// using the value of the integral image values above/below that.
|
|
aLeftLobe++;
|
|
aTopLobe++;
|
|
int32_t boxSize = (aLeftLobe + aRightLobe) * (aTopLobe + aBottomLobe);
|
|
|
|
MOZ_ASSERT(boxSize > 0);
|
|
|
|
if (boxSize == 1) {
|
|
return;
|
|
}
|
|
|
|
int32_t stride32bit = aIntegralImageStride / 4;
|
|
|
|
int32_t leftInflation = RoundUpToMultipleOf4(aLeftLobe).value();
|
|
|
|
GenerateIntegralImage_C(leftInflation, aRightLobe, aTopLobe, aBottomLobe,
|
|
aIntegralImage, aIntegralImageStride, aData,
|
|
mStride, size);
|
|
|
|
uint32_t reciprocal = uint32_t((uint64_t(1) << 32) / boxSize);
|
|
|
|
uint32_t *innerIntegral = aIntegralImage + (aTopLobe * stride32bit) + leftInflation;
|
|
|
|
// Storing these locally makes this about 30% faster! Presumably the compiler
|
|
// can't be sure we're not altering the member variables in this loop.
|
|
IntRect skipRect = mSkipRect;
|
|
uint8_t *data = aData;
|
|
int32_t stride = mStride;
|
|
for (int32_t y = 0; y < size.height; y++) {
|
|
bool inSkipRectY = y > skipRect.y && y < skipRect.YMost();
|
|
|
|
uint32_t *topLeftBase = innerIntegral + ((y - aTopLobe) * stride32bit - aLeftLobe);
|
|
uint32_t *topRightBase = innerIntegral + ((y - aTopLobe) * stride32bit + aRightLobe);
|
|
uint32_t *bottomRightBase = innerIntegral + ((y + aBottomLobe) * stride32bit + aRightLobe);
|
|
uint32_t *bottomLeftBase = innerIntegral + ((y + aBottomLobe) * stride32bit - aLeftLobe);
|
|
|
|
for (int32_t x = 0; x < size.width; x++) {
|
|
if (inSkipRectY && x > skipRect.x && x < skipRect.XMost()) {
|
|
x = skipRect.XMost() - 1;
|
|
// Trigger early jump on coming loop iterations, this will be reset
|
|
// next line anyway.
|
|
inSkipRectY = false;
|
|
continue;
|
|
}
|
|
int32_t topLeft = topLeftBase[x];
|
|
int32_t topRight = topRightBase[x];
|
|
int32_t bottomRight = bottomRightBase[x];
|
|
int32_t bottomLeft = bottomLeftBase[x];
|
|
|
|
uint32_t value = bottomRight - topRight - bottomLeft;
|
|
value += topLeft;
|
|
|
|
data[stride * y + x] = (uint64_t(reciprocal) * value + (uint64_t(1) << 31)) >> 32;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Compute the box blur size (which we're calling the blur radius) from
|
|
* the standard deviation.
|
|
*
|
|
* Much of this, the 3 * sqrt(2 * pi) / 4, is the known value for
|
|
* approximating a Gaussian using box blurs. This yields quite a good
|
|
* approximation for a Gaussian. Then we multiply this by 1.5 since our
|
|
* code wants the radius of the entire triple-box-blur kernel instead of
|
|
* the diameter of an individual box blur. For more details, see:
|
|
* http://www.w3.org/TR/SVG11/filters.html#feGaussianBlurElement
|
|
* https://bugzilla.mozilla.org/show_bug.cgi?id=590039#c19
|
|
*/
|
|
static const Float GAUSSIAN_SCALE_FACTOR = Float((3 * sqrt(2 * M_PI) / 4) * 1.5);
|
|
|
|
IntSize
|
|
AlphaBoxBlur::CalculateBlurRadius(const Point& aStd)
|
|
{
|
|
IntSize size(static_cast<int32_t>(floor(aStd.x * GAUSSIAN_SCALE_FACTOR + 0.5f)),
|
|
static_cast<int32_t>(floor(aStd.y * GAUSSIAN_SCALE_FACTOR + 0.5f)));
|
|
|
|
return size;
|
|
}
|
|
|
|
}
|
|
}
|