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Diffstat (limited to 'base/gfx/skia_utils.cc')
-rw-r--r-- | base/gfx/skia_utils.cc | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/base/gfx/skia_utils.cc b/base/gfx/skia_utils.cc new file mode 100644 index 0000000..60e977d --- /dev/null +++ b/base/gfx/skia_utils.cc @@ -0,0 +1,99 @@ +// Copyright 2008, Google Inc. +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "base/gfx/skia_utils.h" + +#include "base/logging.h" +#include "SkRect.h" +#include "SkGradientShader.h" + +namespace { + +COMPILE_ASSERT(offsetof(RECT, left) == offsetof(SkIRect, fLeft), o1); +COMPILE_ASSERT(offsetof(RECT, top) == offsetof(SkIRect, fTop), o2); +COMPILE_ASSERT(offsetof(RECT, right) == offsetof(SkIRect, fRight), o3); +COMPILE_ASSERT(offsetof(RECT, bottom) == offsetof(SkIRect, fBottom), o4); +COMPILE_ASSERT(sizeof(RECT().left) == sizeof(SkIRect().fLeft), o5); +COMPILE_ASSERT(sizeof(RECT().top) == sizeof(SkIRect().fTop), o6); +COMPILE_ASSERT(sizeof(RECT().right) == sizeof(SkIRect().fRight), o7); +COMPILE_ASSERT(sizeof(RECT().bottom) == sizeof(SkIRect().fBottom), o8); +COMPILE_ASSERT(sizeof(RECT) == sizeof(SkIRect), o9); + +} // namespace + +namespace gfx { + +POINT SkPointToPOINT(const SkPoint& point) { + POINT win_point = { SkScalarRound(point.fX), SkScalarRound(point.fY) }; + return win_point; +} + +SkRect RECTToSkRect(const RECT& rect) { + SkRect sk_rect = { SkIntToScalar(rect.left), SkIntToScalar(rect.top), + SkIntToScalar(rect.right), SkIntToScalar(rect.bottom) }; + return sk_rect; +} + +SkShader* CreateGradientShader(int start_point, + int end_point, + SkColor start_color, + SkColor end_color) { + SkColor grad_colors[2] = { start_color, end_color}; + SkPoint grad_points[2]; + grad_points[0].set(SkIntToScalar(0), SkIntToScalar(start_point)); + grad_points[1].set(SkIntToScalar(0), SkIntToScalar(end_point)); + + return SkGradientShader::CreateLinear( + grad_points, grad_colors, NULL, 2, SkShader::kRepeat_TileMode); +} + + +SkColor COLORREFToSkColor(COLORREF color) { +#ifndef _MSC_VER + return SkColorSetRGB(GetRValue(color), GetGValue(color), GetBValue(color)); +#else + // ARGB = 0xFF000000 | ((0BGR -> RGB0) >> 8) + return 0xFF000000u | (_byteswap_ulong(color) >> 8); +#endif +} + +COLORREF SkColorToCOLORREF(SkColor color) { + // Currently, Alpha is always 255 or the color is 0 so there is no need to + // demultiply the channels. If this DCHECK() is ever hit, the full + // (SkColorGetX(color) * 255 / a) will have to be added in the conversion. + DCHECK((0xFF == SkColorGetA(color)) || (0 == color)); +#ifndef _MSC_VER + return RGB(SkColorGetR(color), SkColorGetG(color), SkColorGetB(color)); +#else + // 0BGR = ((ARGB -> BGRA) >> 8) + return (_byteswap_ulong(color) >> 8); +#endif +} + +} // namespace gfx |