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/ImageInfo_012.cpp b/docs/examples/ImageInfo_012.cpp
new file mode 100644
index 0000000..0ab5ee3
--- /dev/null
+++ b/docs/examples/ImageInfo_012.cpp
@@ -0,0 +1,52 @@
+// 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=dd81527bbdf5eaae7dd21ac04ab84f9e
+REG_FIDDLE(ImageInfo_012, 256, 96, false, 0) {
+union FloatUIntUnion {
+ uint32_t fUInt;
+ float fFloat;
+};
+uint16_t FloatToHalf(float f) {
+ static const FloatUIntUnion magic = { 15 << 23 };
+ static const uint32_t round_mask = ~0xfffu;
+ FloatUIntUnion floatUnion;
+ floatUnion.fFloat = f;
+ uint32_t sign = floatUnion.fUInt & 0x80000000u;
+ floatUnion.fUInt ^= sign;
+ floatUnion.fUInt &= round_mask;
+ floatUnion.fFloat *= magic.fFloat;
+ floatUnion.fUInt -= round_mask;
+ return (floatUnion.fUInt >> 13) | (sign >> 16);
+}
+
+void draw(SkCanvas* canvas) {
+ canvas->scale(16, 16);
+ SkBitmap bitmap;
+ SkImageInfo imageInfo = SkImageInfo::Make(2, 2, kRGBA_F16_SkColorType, kPremul_SkAlphaType);
+ bitmap.allocPixels(imageInfo);
+ SkCanvas offscreen(bitmap);
+ offscreen.clear(SK_ColorGREEN);
+ canvas->drawBitmap(bitmap, 0, 0);
+ auto H = [](float c) -> uint16_t {
+ return FloatToHalf(c);
+ };
+ // R G B A
+ uint16_t red_f16[][4] = { { H(1.0), H(0.0), H(0.0), H(1.0) },
+ { H(.75), H(0.0), H(0.0), H(1.0) },
+ { H(.50), H(0.0), H(0.0), H(1.0) },
+ { H(.25), H(0.0), H(0.0), H(1.0) } };
+ uint16_t blue_f16[][4] = { { H(0.0), H(0.0), H(1.0), H(1.0) },
+ { H(0.0), H(0.0), H(.75), H(1.0) },
+ { H(0.0), H(0.0), H(.50), H(1.0) },
+ { H(0.0), H(0.0), H(.25), H(1.0) } };
+ SkPixmap redPixmap(imageInfo, red_f16, imageInfo.minRowBytes());
+ if (bitmap.writePixels(redPixmap, 0, 0)) {
+ canvas->drawBitmap(bitmap, 2, 2);
+ }
+ SkPixmap bluePixmap(imageInfo, blue_f16, imageInfo.minRowBytes());
+ if (bitmap.writePixels(bluePixmap, 0, 0)) {
+ canvas->drawBitmap(bitmap, 4, 4);
+ }
+}
+} // END FIDDLE