skia2/docs/examples/Canvas_empty_constructor.cpp
John Stiles 7bf799956d Reland "Add format-specifier warnings to SkDebugf."
This is a reland of e58831cd95

Original change's description:
> Add format-specifier warnings to SkDebugf.
>
> This CL fixes up many existing format-specifier violations in Skia.
> Note that GCC has a warning for formatting nothing, so existing calls to
> `SkDebugf("")` have been removed, or replaced with `SkDebugf("%s", "")`.
> These were apparently meant to be used as a place to set a breakpoint.
>
> Some of our clients also use SkDebug with bad format specifiers, so this
> check is currently only enabled when SKIA_IMPLEMENTATION is true.
>
> Change-Id: I8177a1298a624c6936adc24e0d8f481362a356d0
> Bug: skia:12143
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/420902
> Auto-Submit: John Stiles <johnstiles@google.com>
> Commit-Queue: Brian Osman <brianosman@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

Bug: skia:12143
Change-Id: Id3c0c21436ebd13899908d5ed5d44c42a0e23921
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/421918
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
2021-06-25 17:57:43 +00:00

19 lines
673 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=4a00e6589e862fde5be532f4b6e316ce
REG_FIDDLE(Canvas_empty_constructor, 256, 256, true, 0) {
static void check_for_rotated_ctm(const SkCanvas* canvas) {
const SkM44 matrix = canvas->getLocalToDevice();
SkDebugf("ctm is identity = %s\n", matrix == SkM44() ? "true" : "false");
}
void draw(SkCanvas* canvas) {
check_for_rotated_ctm(canvas);
canvas->rotate(30);
check_for_rotated_ctm(canvas);
SkCanvas defaultCanvas;
check_for_rotated_ctm(&defaultCanvas);
}
} // END FIDDLE