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/Canvas_004.cpp b/docs/examples/Canvas_004.cpp
new file mode 100644
index 0000000..9c8dd97
--- /dev/null
+++ b/docs/examples/Canvas_004.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=dd92db963af190e849894038f39b598a
+REG_FIDDLE(Canvas_004, 256, 256, true, 0) {
+void draw(SkCanvas* ) {
+ SkBitmap bitmap;
+ // create a bitmap 5 wide and 11 high
+ bitmap.allocPixels(SkImageInfo::MakeN32Premul(5, 11));
+ SkCanvas canvas(bitmap);
+ canvas.clear(SK_ColorWHITE); // white is Unpremultiplied, in ARGB order
+ SkPixmap pixmap; // provides guaranteed access to the drawn pixels
+ if (!canvas.peekPixels(&pixmap)) {
+ SkDebugf("peekPixels should never fail.\n");
+ }
+ const SkPMColor* pixels = pixmap.addr32(); // points to top-left of bitmap
+ SkPMColor pmWhite = pixels[0]; // the Premultiplied format may vary
+ SkPaint paint; // by default, draws black, 12 point text
+ SkFont font;
+ canvas.drawString("!", 1, 10, font, paint); // 1 char at baseline (1, 10)
+ for (int y = 0; y < bitmap.height(); ++y) {
+ for (int x = 0; x < bitmap.width(); ++x) {
+ SkDebugf("%c", *pixels++ == pmWhite ? '-' : 'x');
+ }
+ SkDebugf("\n");
+ }
+}
+} // END FIDDLE