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Unified Diff: dm/DMImageTask.cpp

Issue 802793002: Add image decoding mode to DM. (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: transparent, build fixes Created 6 years ago
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Index: dm/DMImageTask.cpp
diff --git a/dm/DMImageTask.cpp b/dm/DMImageTask.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1657984f1ee71d6ed4956320142aa9f1bf053619
--- /dev/null
+++ b/dm/DMImageTask.cpp
@@ -0,0 +1,78 @@
+#include "DMImageTask.h"
+#include "DMUtil.h"
+#include "DMWriteTask.h"
+#include "SkImageDecoder.h"
+#include "SkRandom.h"
+
+#include <string.h>
+
+namespace DM {
+
+// This converts file names like "mandrill_128.r11.ktx" into
+// "mandrill-128-r11_ktx" or "mandrill-128-r11-5-subsets_ktx".
+static SkString task_name(SkString filename, int subsets) {
+ const char* ext = strrchr(filename.c_str(), '.');
+ SkString name(filename.c_str(), ext - filename.c_str());
+ if (subsets > 0) {
+ name.appendf("_%d_subsets", subsets);
+ }
+ name = FileToTaskName(name); // Promote any stray '.' in the filename to '_'.
+ name.append(ext); // Tack on the extension, including the '.'.
+ return FileToTaskName(name); // Promote that last '.' to '_', other '_' to '-'.
+}
+
+ImageTask::ImageTask(Reporter* r, TaskRunner* t, const SkData* encoded, SkString name, int subsets)
+ : CpuTask(r, t)
+ , fEncoded(SkRef(encoded))
+ , fName(task_name(name, subsets))
+ , fSubsets(subsets) {}
+
+void ImageTask::draw() {
+ if (fSubsets == 0) {
+ // Decoding the whole image is considerably simpler than decoding subsets!
+ SkBitmap bitmap;
+ if (!SkImageDecoder::DecodeMemory(fEncoded->data(), fEncoded->size(), &bitmap)) {
+ return this->fail("Can't DecodeMemory");
+ }
+ this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", bitmap)));
+ return;
+ }
+
+ SkMemoryStream stream(fEncoded->data(), fEncoded->size());
+ SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream));
+ if (!decoder) {
+ return this->fail("Can't find good decoder.");
+ }
+
+ int w,h;
+ if (!decoder->buildTileIndex(&stream, &w, &h) || w*h == 1) {
+ return; // Subset decoding is not always supported.
+ }
+
+ SkBitmap composite;
+ composite.allocN32Pixels(w,h); // We're lazy here and just always use native 8888.
+ composite.eraseColor(SK_ColorTRANSPARENT);
+ SkCanvas canvas(composite);
+
+ SkRandom rand;
+ for (int i = 0; i < fSubsets; i++) {
+ SkIRect rect;
+ do {
+ rect.fLeft = rand.nextULessThan(w);
+ rect.fTop = rand.nextULessThan(h);
+ rect.fRight = rand.nextULessThan(w);
+ rect.fBottom = rand.nextULessThan(h);
+ rect.sort();
+ } while (rect.isEmpty());
+
+ SkBitmap subset;
+ if (!decoder->decodeSubset(&subset, rect, kN32_SkColorType)) {
+ return this->fail("Could not decode subset.");
+ }
+ canvas.drawBitmap(subset, SkIntToScalar(rect.fLeft), SkIntToScalar(rect.fTop));
+ }
+ canvas.flush();
+ this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", composite)));
+}
+
+} // namespace DM
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