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" |
commit-bot@chromium.org | 8b0e8ac | 2014-01-30 18:58:24 +0000 | [diff] [blame] | 5 | #include "SkReadBuffer.h" |
| 6 | #include "SkWriteBuffer.h" |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 7 | |
reed@google.com | e763951 | 2012-08-07 14:25:44 +0000 | [diff] [blame] | 8 | // Simple helper canvas that "takes ownership" of the provided device, so that |
| 9 | // when this canvas goes out of scope, so will its device. Could be replaced |
| 10 | // with the following: |
| 11 | // |
| 12 | // SkCanvas canvas(device); |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 13 | // SkAutoTUnref<SkBaseDevice> aur(device); |
reed@google.com | e763951 | 2012-08-07 14:25:44 +0000 | [diff] [blame] | 14 | // |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 15 | class OwnDeviceCanvas : public SkCanvas { |
| 16 | public: |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 17 | OwnDeviceCanvas(SkBaseDevice* device) : SkCanvas(device) { |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 18 | SkSafeUnref(device); |
| 19 | } |
| 20 | }; |
| 21 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 22 | /////////////////////////////////////////////////////////////////////////////// |
| 23 | |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 24 | bool SkDownSampleImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src, |
senorblanco@chromium.org | 4cb543d | 2014-03-14 15:44:01 +0000 | [diff] [blame] | 25 | const Context&, |
commit-bot@chromium.org | ae761f7 | 2014-02-05 22:32:02 +0000 | [diff] [blame] | 26 | SkBitmap* result, SkIPoint*) const { |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 27 | SkScalar scale = fScale; |
| 28 | if (scale > SK_Scalar1 || scale <= 0) { |
| 29 | return false; |
| 30 | } |
rmistry@google.com | fbfcd56 | 2012-08-23 18:09:54 +0000 | [diff] [blame] | 31 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 32 | int dstW = SkScalarRoundToInt(src.width() * scale); |
| 33 | int dstH = SkScalarRoundToInt(src.height() * scale); |
| 34 | if (dstW < 1) { |
| 35 | dstW = 1; |
| 36 | } |
| 37 | if (dstH < 1) { |
| 38 | dstH = 1; |
| 39 | } |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 40 | |
| 41 | SkBitmap tmp; |
| 42 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 43 | // downsample |
| 44 | { |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 45 | SkBaseDevice* dev = proxy->createDevice(dstW, dstH); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 46 | if (NULL == dev) { |
| 47 | return false; |
| 48 | } |
| 49 | OwnDeviceCanvas canvas(dev); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 50 | SkPaint paint; |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 51 | |
reed | 93a1215 | 2015-03-16 10:08:34 -0700 | [diff] [blame] | 52 | paint.setFilterQuality(kLow_SkFilterQuality); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 53 | canvas.scale(scale, scale); |
| 54 | canvas.drawBitmap(src, 0, 0, &paint); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 55 | tmp = dev->accessBitmap(false); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 56 | } |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 57 | |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 58 | // upscale |
| 59 | { |
robertphillips@google.com | 1f2f338 | 2013-08-29 11:54:56 +0000 | [diff] [blame] | 60 | SkBaseDevice* dev = proxy->createDevice(src.width(), src.height()); |
reed@google.com | 76dd277 | 2012-01-05 21:15:07 +0000 | [diff] [blame] | 61 | if (NULL == dev) { |
| 62 | return false; |
| 63 | } |
| 64 | OwnDeviceCanvas canvas(dev); |
| 65 | |
| 66 | SkRect r = SkRect::MakeWH(SkIntToScalar(src.width()), |
| 67 | SkIntToScalar(src.height())); |
| 68 | canvas.drawBitmapRect(tmp, NULL, r, NULL); |
| 69 | *result = dev->accessBitmap(false); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 70 | } |
| 71 | return true; |
| 72 | } |
| 73 | |
reed | 9fa60da | 2014-08-21 07:59:51 -0700 | [diff] [blame] | 74 | SkFlattenable* SkDownSampleImageFilter::CreateProc(SkReadBuffer& buffer) { |
| 75 | SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1); |
| 76 | return Create(buffer.readScalar(), common.getInput(0)); |
| 77 | } |
| 78 | |
commit-bot@chromium.org | 8b0e8ac | 2014-01-30 18:58:24 +0000 | [diff] [blame] | 79 | void SkDownSampleImageFilter::flatten(SkWriteBuffer& buffer) const { |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 80 | this->INHERITED::flatten(buffer); |
reed@google.com | 32d25b6 | 2011-12-20 16:19:00 +0000 | [diff] [blame] | 81 | buffer.writeScalar(fScale); |
| 82 | } |
robertphillips | f3f5bad | 2014-12-19 13:49:15 -0800 | [diff] [blame] | 83 | |
| 84 | #ifndef SK_IGNORE_TO_STRING |
| 85 | void SkDownSampleImageFilter::toString(SkString* str) const { |
| 86 | str->appendf("SkDownSampleImageFilter: ("); |
| 87 | str->append(")"); |
| 88 | } |
| 89 | #endif |