skia2/docs/examples/Matrix_decomposeScale.cpp
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

23 lines
899 B
C++

// 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 "tools/fiddle/examples.h"
// HASH=139b874da0a3ede1f3df88119085c0aa
REG_FIDDLE(Matrix_decomposeScale, 256, 256, true, 0) {
void draw(SkCanvas* canvas) {
SkMatrix matrix;
matrix.setRotate(90 * SK_Scalar1);
matrix.postScale(1.f / 4, 1.f / 2);
matrix.dump();
SkSize scale = {SK_ScalarNaN, SK_ScalarNaN};
SkMatrix remaining;
remaining.reset();
bool success = matrix.decomposeScale(&scale, &remaining);
SkDebugf("success: %s ", success ? "true" : "false");
SkDebugf("scale: %g, %g\n", scale.width(), scale.height());
remaining.dump();
SkMatrix scaleMatrix = SkMatrix::MakeScale(scale.width(), scale.height());
SkMatrix combined = SkMatrix::Concat(scaleMatrix, remaining);
combined.dump();
}
} // END FIDDLE