skia2/docs/examples/Surface_018.cpp
Hal Canary 83c2f70b51 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>
2019-03-15 15:19:18 +00:00

18 lines
782 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 "fiddle/examples.h"
// HASH=b18b8ab693b09eb70a1d22ab63790cc7
REG_FIDDLE(Surface_018, 256, 64, false, 0) {
void draw(SkCanvas* canvas) {
sk_sp<SkSurface> big(SkSurface::MakeRasterN32Premul(64, 64));
sk_sp<SkSurface> lil(big->makeSurface(SkImageInfo::MakeN32(32, 32, kPremul_SkAlphaType)));
big->getCanvas()->clear(SK_ColorRED);
lil->getCanvas()->clear(SK_ColorBLACK);
sk_sp<SkImage> early(big->makeImageSnapshot());
lil->draw(big->getCanvas(), 16, 16, nullptr);
sk_sp<SkImage> later(big->makeImageSnapshot({0, 0, 16, 16}));
canvas->drawImage(early, 0, 0);
canvas->drawImage(later, 0, 0);
}
} // END FIDDLE