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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
namespace android {
namespace NinePatchUtils {
static inline void SetLatticeDivs(SkCanvas::Lattice* lattice, const Res_png_9patch& chunk,
int width, int height) {
lattice->fXCount = chunk.numXDivs;
lattice->fYCount = chunk.numYDivs;
lattice->fXDivs = chunk.getXDivs();
lattice->fYDivs = chunk.getYDivs();
// We'll often see ninepatches where the last div is equal to the width or height.
// This doesn't provide any additional information and is not supported by Skia.
if (lattice->fXCount > 0 && width == lattice->fXDivs[lattice->fXCount - 1]) {
lattice->fXCount--;
}
if (lattice->fYCount > 0 && height == lattice->fYDivs[lattice->fYCount - 1]) {
lattice->fYCount--;
}
}
static inline int NumDistinctRects(const SkCanvas::Lattice& lattice) {
int xRects;
if (lattice.fXCount > 0) {
xRects = (0 == lattice.fXDivs[0]) ? lattice.fXCount : lattice.fXCount + 1;
} else {
xRects = 1;
}
int yRects;
if (lattice.fYCount > 0) {
yRects = (0 == lattice.fYDivs[0]) ? lattice.fYCount : lattice.fYCount + 1;
} else {
yRects = 1;
}
return xRects * yRects;
}
static inline void SetLatticeFlags(SkCanvas::Lattice* lattice, SkCanvas::Lattice::RectType* flags,
int numFlags, const Res_png_9patch& chunk, SkColor* colors) {
lattice->fRectTypes = flags;
lattice->fColors = colors;
sk_bzero(flags, numFlags * sizeof(SkCanvas::Lattice::RectType));
sk_bzero(colors, numFlags * sizeof(SkColor));
bool needPadRow = lattice->fYCount > 0 && 0 == lattice->fYDivs[0];
bool needPadCol = lattice->fXCount > 0 && 0 == lattice->fXDivs[0];
int yCount = lattice->fYCount;
if (needPadRow) {
// Skip flags for the degenerate first row of rects.
flags += lattice->fXCount + 1;
colors += lattice->fXCount + 1;
yCount--;
}
int i = 0;
bool setFlags = false;
for (int y = 0; y < yCount + 1; y++) {
for (int x = 0; x < lattice->fXCount + 1; x++) {
if (0 == x && needPadCol) {
// First rect of each column is degenerate, skip the flag.
flags++;
colors++;
continue;
}
uint32_t currentColor = chunk.getColors()[i++];
if (Res_png_9patch::TRANSPARENT_COLOR == currentColor) {
*flags = SkCanvas::Lattice::kTransparent;
setFlags = true;
} else if (Res_png_9patch::NO_COLOR != currentColor) {
*flags = SkCanvas::Lattice::kFixedColor;
*colors = currentColor;
setFlags = true;
}
flags++;
colors++;
}
}
if (!setFlags) {
lattice->fRectTypes = nullptr;
lattice->fColors = nullptr;
}
}
} // namespace NinePatchUtils
} // namespace android
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