djsollen@google.com | c73dd5c | 2012-08-07 15:54:32 +0000 | [diff] [blame] | 1 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 2 | #include "SkTestImageFilters.h" |
| 3 | #include "SkCanvas.h" |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 4 | #include "SkDevice.h" |
djsollen@google.com | c73dd5c | 2012-08-07 15:54:32 +0000 | [diff] [blame] | 5 | #include "SkFlattenableBuffers.h" |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 6 | |
reed@google.com | e763951 | 2012-08-07 14:25:44 +0000 | [diff] [blame] | 7 | // Simple helper canvas that "takes ownership" of the provided device, so that |
| 8 | // when this canvas goes out of scope, so will its device. Could be replaced |
| 9 | // with the following: |
| 10 | // |
| 11 | // SkCanvas canvas(device); |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 12 | // SkAutoTUnref<SkBaseDevice> aur(device); |
reed@google.com | e763951 | 2012-08-07 14:25:44 +0000 | [diff] [blame] | 13 | // |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 14 | class OwnDeviceCanvas : public SkCanvas { |
| 15 | public: |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 16 | OwnDeviceCanvas(SkBaseDevice* device) : SkCanvas(device) { |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 17 | SkSafeUnref(device); |
| 18 | } |
| 19 | }; |
| 20 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 21 | /////////////////////////////////////////////////////////////////////////////// |
| 22 | |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 23 | bool SkDownSampleImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, |
sugoi@google.com | e0e385c | 2013-03-11 18:50:03 +0000 | [diff] [blame] | 24 | const SkMatrix&, |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 25 | SkBitmap* result, SkIPoint*) { |
| 26 | SkScalar scale = fScale; |
| 27 | if (scale > SK_Scalar1 || scale <= 0) { |
| 28 | return false; |
| 29 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 30 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 31 | int dstW = SkScalarRoundToInt(src.width() * scale); |
| 32 | int dstH = SkScalarRoundToInt(src.height() * scale); |
| 33 | if (dstW < 1) { |
| 34 | dstW = 1; |
| 35 | } |
| 36 | if (dstH < 1) { |
| 37 | dstH = 1; |
| 38 | } |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 39 | |
| 40 | SkBitmap tmp; |
| 41 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 42 | // downsample |
| 43 | { |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 44 | SkBaseDevice* dev = proxy->createDevice(dstW, dstH); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 45 | if (NULL == dev) { |
| 46 | return false; |
| 47 | } |
| 48 | OwnDeviceCanvas canvas(dev); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 49 | SkPaint paint; |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 50 | |
reed@google.com | 4469938 | 2013-10-31 17:28:30 +0000 | [diff] [blame] | 51 | paint.setFilterLevel(SkPaint::kLow_FilterLevel); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 52 | canvas.scale(scale, scale); |
| 53 | canvas.drawBitmap(src, 0, 0, &paint); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 54 | tmp = dev->accessBitmap(false); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 55 | } |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 56 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 57 | // upscale |
| 58 | { |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 59 | SkBaseDevice* dev = proxy->createDevice(src.width(), src.height()); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 60 | if (NULL == dev) { |
| 61 | return false; |
| 62 | } |
| 63 | OwnDeviceCanvas canvas(dev); |
| 64 | |
| 65 | SkRect r = SkRect::MakeWH(SkIntToScalar(src.width()), |
| 66 | SkIntToScalar(src.height())); |
| 67 | canvas.drawBitmapRect(tmp, NULL, r, NULL); |
| 68 | *result = dev->accessBitmap(false); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 69 | } |
| 70 | return true; |
| 71 | } |
| 72 | |
djsollen@google.com | 5492424 | 2012-03-29 15:18:04 +0000 | [diff] [blame] | 73 | void SkDownSampleImageFilter::flatten(SkFlattenableWriteBuffer& buffer) const { |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 74 | this->INHERITED::flatten(buffer); |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 75 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 76 | buffer.writeScalar(fScale); |
| 77 | } |
| 78 | |
commit-bot@chromium.org | ce33d60 | 2013-11-25 21:46:31 +0000 | [diff] [blame^] | 79 | SkDownSampleImageFilter::SkDownSampleImageFilter(SkFlattenableReadBuffer& buffer) |
| 80 | : INHERITED(1, buffer) { |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 81 | fScale = buffer.readScalar(); |
commit-bot@chromium.org | c0b7e10 | 2013-10-23 17:06:21 +0000 | [diff] [blame] | 82 | buffer.validate(SkScalarIsFinite(fScale)); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 83 | } |