Compile all fiddle examples locally
Motivation: it would be a good idea if the API documentation examples
were checked into the skia repository, so we could make sure they
compile as part of the commit queue.
Fiddle would make/update a named fiddle each time it gets a new
commit of Skia, extracted from the code in the examples/ directory.
The docs would point at those named fiddles. Named fiddles have urls
in the form:
https://fiddle.skia.org/c/@Bitmap_000
Then we would stick a link to the example into the header documentation
like this:
/** Allocates the pixel memory for the bitmap, given its dimensions
and SkColorType. Returns true on success, where success means
either setPixels() or setPixelRef() was called.
@param bitmap SkBitmap containing SkImageInfo as input, and
SkPixelRef as output
@return true if SkPixelRef was allocated
@example https://fiddle.skia.org/c/@Bitmap_000
*/
bool allocPixelRef(SkBitmap* bitmap) override;
There are still around 200 disabled examples that need to be fixed
(these result from API changes since the author left).
Change-Id: I14a31348a9ccaaa31f65424b91e3a3533d2583a7
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/198824
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
diff --git a/docs/examples/Matrix_093.cpp b/docs/examples/Matrix_093.cpp
new file mode 100644
index 0000000..84914fb
--- /dev/null
+++ b/docs/examples/Matrix_093.cpp
@@ -0,0 +1,28 @@
+// Copyright 2019 Google LLC.
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+#include "fiddle/examples.h"
+// HASH=fad6b92b21b1e1deeae61978cec2d232
+REG_FIDDLE(Matrix_093, 256, 256, false, 3) {
+void draw(SkCanvas* canvas) {
+ SkMatrix matrix;
+ const SkPoint center = { 128, 128 };
+ matrix.setScale(20, 25, center.fX, center.fY);
+ matrix.postRotate(75, center.fX, center.fY);
+ {
+ SkAutoCanvasRestore acr(canvas, true);
+ canvas->concat(matrix);
+ canvas->drawBitmap(source, 0, 0);
+ }
+ if (matrix.isFixedStepInX()) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ SkVector step = matrix.fixedStepInX(128);
+ SkVector end = center + step;
+ canvas->drawLine(center, end, paint);
+ SkVector arrow = { step.fX + step.fY, step.fY - step.fX};
+ arrow = arrow * .25f;
+ canvas->drawLine(end, end - arrow, paint);
+ canvas->drawLine(end, {end.fX + arrow.fY, end.fY - arrow.fX}, paint);
+ }
+}
+} // END FIDDLE