private void performDecode(DecodeTask currentDecodeTask) throws IOException {
if (isTaskDead(currentDecodeTask)) {
Log.d(DECODE_SERVICE, "Skipping decode task for page " + currentDecodeTask.pageNumber);
return;
}
Log.d(DECODE_SERVICE, "Starting decode of page: " + currentDecodeTask.pageNumber);
CodecPage vuPage = getPage(currentDecodeTask.pageNumber);
preloadNextPage(currentDecodeTask.pageNumber);
if (isTaskDead(currentDecodeTask)) {
return;
}
Log.d(DECODE_SERVICE, "Start converting map to bitmap");
float scale = calculateScale(vuPage) * currentDecodeTask.zoom;
final Bitmap bitmap =
vuPage.renderBitmap(
getScaledWidth(currentDecodeTask, vuPage, scale),
getScaledHeight(currentDecodeTask, vuPage, scale),
currentDecodeTask.pageSliceBounds);
Log.d(DECODE_SERVICE, "Converting map to bitmap finished");
if (isTaskDead(currentDecodeTask)) {
bitmap.recycle();
return;
}
finishDecoding(currentDecodeTask, bitmap);
}
private CodecPage getPage(int pageIndex) {
if (!pages.containsKey(pageIndex) || pages.get(pageIndex).get() == null) {
pages.put(pageIndex, new SoftReference<CodecPage>(document.getPage(pageIndex)));
pageEvictionQueue.remove(pageIndex);
pageEvictionQueue.offer(pageIndex);
if (pageEvictionQueue.size() > PAGE_POOL_SIZE) {
Integer evictedPageIndex = pageEvictionQueue.poll();
CodecPage evictedPage = pages.remove(evictedPageIndex).get();
if (evictedPage != null) {
evictedPage.recycle();
}
}
}
return pages.get(pageIndex).get();
}
private void waitForDecode(CodecPage vuPage) {
vuPage.waitForDecode();
}
private float calculateScale(CodecPage codecPage) {
return 1.0f * getTargetWidth() / codecPage.getWidth();
}
private int getScaledWidth(CodecPage vuPage, float scale) {
return (int) (scale * vuPage.getWidth());
}
private int getScaledHeight(CodecPage vuPage, float scale) {
return (int) (scale * vuPage.getHeight());
}