83c2f70b51
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>
31 lines
1.3 KiB
C++
31 lines
1.3 KiB
C++
// Copyright 2019 Google LLC.
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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#include "fiddle/examples.h"
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// HASH=87f55e62ec4c3535e1a5d0f1415b20c6
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REG_FIDDLE(Canvas_001, 256, 256, true, 0) {
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void draw(SkCanvas* ) {
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const int width = 3;
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const int height = 3;
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SkPMColor pixels[height][width]; // allocate a 3 by 3 Premultiplied bitmap on the stack
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// create a SkCanvas backed by a raster device, and delete it when the
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// function goes out of scope.
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std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirectN32(
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width,
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height,
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pixels[0], // top-left of the bitmap
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sizeof(pixels[0])); // byte width of the each row
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// write a Premultiplied value for white into all pixels in the bitmap
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canvas->clear(SK_ColorWHITE);
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SkPMColor pmWhite = pixels[0][0]; // the Premultiplied format may vary
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SkPaint paint; // by default, draws black
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canvas->drawPoint(1, 1, paint); // draw in the center
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canvas->flush(); // ensure that pixels is ready to be read
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for (int y = 0; y < height; ++y) {
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for (int x = 0; x < width; ++x) {
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SkDebugf("%c", pixels[y][x] == pmWhite ? '-' : 'x');
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}
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SkDebugf("\n");
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}
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}
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} // END FIDDLE
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