mtklein | f6139f7 | 2014-12-12 16:41:12 -0800 | [diff] [blame] | 1 | #include "DMImageTask.h" |
| 2 | #include "DMUtil.h" |
| 3 | #include "DMWriteTask.h" |
| 4 | #include "SkImageDecoder.h" |
| 5 | #include "SkRandom.h" |
| 6 | |
| 7 | #include <string.h> |
| 8 | |
| 9 | namespace DM { |
| 10 | |
| 11 | // This converts file names like "mandrill_128.r11.ktx" into |
| 12 | // "mandrill-128-r11_ktx" or "mandrill-128-r11-5-subsets_ktx". |
| 13 | static SkString task_name(SkString filename, int subsets) { |
| 14 | const char* ext = strrchr(filename.c_str(), '.'); |
| 15 | SkString name(filename.c_str(), ext - filename.c_str()); |
| 16 | if (subsets > 0) { |
| 17 | name.appendf("_%d_subsets", subsets); |
| 18 | } |
| 19 | name = FileToTaskName(name); // Promote any stray '.' in the filename to '_'. |
| 20 | name.append(ext); // Tack on the extension, including the '.'. |
| 21 | return FileToTaskName(name); // Promote that last '.' to '_', other '_' to '-'. |
| 22 | } |
| 23 | |
| 24 | ImageTask::ImageTask(Reporter* r, TaskRunner* t, const SkData* encoded, SkString name, int subsets) |
| 25 | : CpuTask(r, t) |
| 26 | , fEncoded(SkRef(encoded)) |
| 27 | , fName(task_name(name, subsets)) |
| 28 | , fSubsets(subsets) {} |
| 29 | |
| 30 | void ImageTask::draw() { |
| 31 | if (fSubsets == 0) { |
| 32 | // Decoding the whole image is considerably simpler than decoding subsets! |
| 33 | SkBitmap bitmap; |
| 34 | if (!SkImageDecoder::DecodeMemory(fEncoded->data(), fEncoded->size(), &bitmap)) { |
| 35 | return this->fail("Can't DecodeMemory"); |
| 36 | } |
| 37 | this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", bitmap))); |
| 38 | return; |
| 39 | } |
| 40 | |
| 41 | SkMemoryStream stream(fEncoded->data(), fEncoded->size()); |
| 42 | SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(&stream)); |
| 43 | if (!decoder) { |
| 44 | return this->fail("Can't find good decoder."); |
| 45 | } |
| 46 | |
| 47 | int w,h; |
| 48 | if (!decoder->buildTileIndex(&stream, &w, &h) || w*h == 1) { |
| 49 | return; // Subset decoding is not always supported. |
| 50 | } |
| 51 | |
| 52 | SkBitmap composite; |
| 53 | composite.allocN32Pixels(w,h); // We're lazy here and just always use native 8888. |
| 54 | composite.eraseColor(SK_ColorTRANSPARENT); |
| 55 | SkCanvas canvas(composite); |
| 56 | |
| 57 | SkRandom rand; |
| 58 | for (int i = 0; i < fSubsets; i++) { |
| 59 | SkIRect rect; |
| 60 | do { |
| 61 | rect.fLeft = rand.nextULessThan(w); |
| 62 | rect.fTop = rand.nextULessThan(h); |
| 63 | rect.fRight = rand.nextULessThan(w); |
| 64 | rect.fBottom = rand.nextULessThan(h); |
| 65 | rect.sort(); |
| 66 | } while (rect.isEmpty()); |
| 67 | |
| 68 | SkBitmap subset; |
| 69 | if (!decoder->decodeSubset(&subset, rect, kN32_SkColorType)) { |
| 70 | return this->fail("Could not decode subset."); |
| 71 | } |
| 72 | canvas.drawBitmap(subset, SkIntToScalar(rect.fLeft), SkIntToScalar(rect.fTop)); |
| 73 | } |
| 74 | canvas.flush(); |
| 75 | this->spawnChild(SkNEW_ARGS(WriteTask, (*this, "image", composite))); |
| 76 | } |
| 77 | |
| 78 | } // namespace DM |