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94 lines
3.6 KiB
94 lines
3.6 KiB
7 months ago
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "NinePatchPeeker.h"
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#include <SkBitmap.h>
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#include <cutils/compiler.h>
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using namespace android;
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bool NinePatchPeeker::readChunk(const char tag[], const void* data, size_t length) {
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if (!strcmp("npTc", tag) && length >= sizeof(Res_png_9patch)) {
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Res_png_9patch* patch = (Res_png_9patch*) data;
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size_t patchSize = patch->serializedSize();
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if (length != patchSize) {
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return false;
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}
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// You have to copy the data because it is owned by the png reader
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Res_png_9patch* patchNew = (Res_png_9patch*) malloc(patchSize);
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memcpy(patchNew, patch, patchSize);
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Res_png_9patch::deserialize(patchNew);
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patchNew->fileToDevice();
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free(mPatch);
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mPatch = patchNew;
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mPatchSize = patchSize;
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} else if (!strcmp("npLb", tag) && length == sizeof(int32_t) * 4) {
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mHasInsets = true;
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memcpy(&mOpticalInsets, data, sizeof(int32_t) * 4);
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} else if (!strcmp("npOl", tag) && length == 24) { // 4 int32_ts, 1 float, 1 int32_t sized byte
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mHasInsets = true;
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memcpy(&mOutlineInsets, data, sizeof(int32_t) * 4);
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mOutlineRadius = ((const float*)data)[4];
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mOutlineAlpha = ((const int32_t*)data)[5] & 0xff;
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}
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return true; // keep on decoding
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}
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static void scaleDivRange(int32_t* divs, int count, float scale, int maxValue) {
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for (int i = 0; i < count; i++) {
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divs[i] = int32_t(divs[i] * scale + 0.5f);
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if (i > 0 && divs[i] == divs[i - 1]) {
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divs[i]++; // avoid collisions
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}
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}
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if (CC_UNLIKELY(divs[count - 1] > maxValue)) {
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// if the collision avoidance above put some divs outside the bounds of the bitmap,
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// slide outer stretchable divs inward to stay within bounds
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int highestAvailable = maxValue;
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for (int i = count - 1; i >= 0; i--) {
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divs[i] = highestAvailable;
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if (i > 0 && divs[i] <= divs[i-1]) {
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// keep shifting
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highestAvailable = divs[i] - 1;
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} else {
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break;
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}
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}
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}
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}
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void NinePatchPeeker::scale(float scaleX, float scaleY, int scaledWidth, int scaledHeight) {
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if (!mPatch) {
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return;
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}
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// The max value for the divRange is one pixel less than the actual max to ensure that the size
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// of the last div is not zero. A div of size 0 is considered invalid input and will not render.
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if (!SkScalarNearlyEqual(scaleX, 1.0f)) {
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mPatch->paddingLeft = int(mPatch->paddingLeft * scaleX + 0.5f);
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mPatch->paddingRight = int(mPatch->paddingRight * scaleX + 0.5f);
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scaleDivRange(mPatch->getXDivs(), mPatch->numXDivs, scaleX, scaledWidth - 1);
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}
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if (!SkScalarNearlyEqual(scaleY, 1.0f)) {
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mPatch->paddingTop = int(mPatch->paddingTop * scaleY + 0.5f);
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mPatch->paddingBottom = int(mPatch->paddingBottom * scaleY + 0.5f);
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scaleDivRange(mPatch->getYDivs(), mPatch->numYDivs, scaleY, scaledHeight - 1);
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}
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}
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