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/*
* Copyright (C) 2011 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.
*/
#include "NinePatchPeeker.h"
#include <SkBitmap.h>
#include <cutils/compiler.h>
using namespace android;
bool NinePatchPeeker::readChunk(const char tag[], const void* data, size_t length) {
if (!strcmp("npTc", tag) && length >= sizeof(Res_png_9patch)) {
Res_png_9patch* patch = (Res_png_9patch*) data;
size_t patchSize = patch->serializedSize();
if (length != patchSize) {
return false;
}
// You have to copy the data because it is owned by the png reader
Res_png_9patch* patchNew = (Res_png_9patch*) malloc(patchSize);
memcpy(patchNew, patch, patchSize);
Res_png_9patch::deserialize(patchNew);
patchNew->fileToDevice();
free(mPatch);
mPatch = patchNew;
mPatchSize = patchSize;
} else if (!strcmp("npLb", tag) && length == sizeof(int32_t) * 4) {
mHasInsets = true;
memcpy(&mOpticalInsets, data, sizeof(int32_t) * 4);
} else if (!strcmp("npOl", tag) && length == 24) { // 4 int32_ts, 1 float, 1 int32_t sized byte
mHasInsets = true;
memcpy(&mOutlineInsets, data, sizeof(int32_t) * 4);
mOutlineRadius = ((const float*)data)[4];
mOutlineAlpha = ((const int32_t*)data)[5] & 0xff;
}
return true; // keep on decoding
}
static void scaleDivRange(int32_t* divs, int count, float scale, int maxValue) {
for (int i = 0; i < count; i++) {
divs[i] = int32_t(divs[i] * scale + 0.5f);
if (i > 0 && divs[i] == divs[i - 1]) {
divs[i]++; // avoid collisions
}
}
if (CC_UNLIKELY(divs[count - 1] > maxValue)) {
// if the collision avoidance above put some divs outside the bounds of the bitmap,
// slide outer stretchable divs inward to stay within bounds
int highestAvailable = maxValue;
for (int i = count - 1; i >= 0; i--) {
divs[i] = highestAvailable;
if (i > 0 && divs[i] <= divs[i-1]) {
// keep shifting
highestAvailable = divs[i] - 1;
} else {
break;
}
}
}
}
void NinePatchPeeker::scale(float scaleX, float scaleY, int scaledWidth, int scaledHeight) {
if (!mPatch) {
return;
}
// The max value for the divRange is one pixel less than the actual max to ensure that the size
// of the last div is not zero. A div of size 0 is considered invalid input and will not render.
if (!SkScalarNearlyEqual(scaleX, 1.0f)) {
mPatch->paddingLeft = int(mPatch->paddingLeft * scaleX + 0.5f);
mPatch->paddingRight = int(mPatch->paddingRight * scaleX + 0.5f);
scaleDivRange(mPatch->getXDivs(), mPatch->numXDivs, scaleX, scaledWidth - 1);
}
if (!SkScalarNearlyEqual(scaleY, 1.0f)) {
mPatch->paddingTop = int(mPatch->paddingTop * scaleY + 0.5f);
mPatch->paddingBottom = int(mPatch->paddingBottom * scaleY + 0.5f);
scaleDivRange(mPatch->getYDivs(), mPatch->numYDivs, scaleY, scaledHeight - 1);
}
}
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