skia2/docs/examples/Matrix_074.cpp

// 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=e10adbd0bcc940c5d4d872db0e78e892
REG_FIDDLE(Matrix_074, 256, 256, true, 0) {
void draw(SkCanvas* canvas) {
    SkScalar affine[6];
    SkMatrix::SetAffineIdentity(affine);
    const char* names[] = { "ScaleX", "SkewY", "SkewX", "ScaleY", "TransX", "TransY" };
    for (int i = 0; i < 6; ++i) {
        SkDebugf("%s: %g ", names[i], affine[i]);
    }
    SkDebugf("\n");
}
}  // END FIDDLE
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> 2019-03-07 19:53:03 +00:00			`// 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=e10adbd0bcc940c5d4d872db0e78e892`
			`REG_FIDDLE(Matrix_074, 256, 256, true, 0) {`
			`void draw(SkCanvas* canvas) {`
			`SkScalar affine[6];`
			`SkMatrix::SetAffineIdentity(affine);`
			`const char* names[] = { "ScaleX", "SkewY", "SkewX", "ScaleY", "TransX", "TransY" };`
			`for (int i = 0; i < 6; ++i) {`
			`SkDebugf("%s: %g ", names[i], affine[i]);`
			`}`
			`SkDebugf("\n");`
			`}`
			`} // END FIDDLE`