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      1 /*
      2  * Copyright (c) 2006,2007,2008, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 // All of the functions in this file should move to new homes and this file should be deleted.
     32 
     33 #ifndef SkiaUtils_h
     34 #define SkiaUtils_h
     35 
     36 #include "SkMatrix.h"
     37 #include "SkPaint.h"
     38 #include "SkPath.h"
     39 #include "SkXfermode.h"
     40 #include "platform/PlatformExport.h"
     41 #include "platform/geometry/FloatRect.h"
     42 #include "platform/graphics/Color.h"
     43 #include "platform/graphics/GraphicsTypes.h"
     44 #include "platform/transforms/AffineTransform.h"
     45 #include "wtf/MathExtras.h"
     46 
     47 namespace blink {
     48 
     49 class GraphicsContext;
     50 
     51 SkXfermode::Mode PLATFORM_EXPORT WebCoreCompositeToSkiaComposite(CompositeOperator, WebBlendMode = WebBlendModeNormal);
     52 
     53 // move this guy into SkColor.h
     54 SkColor SkPMColorToColor(SkPMColor);
     55 
     56 inline SkPaint::FilterLevel WebCoreInterpolationQualityToSkFilterLevel(InterpolationQuality quality)
     57 {
     58     // FIXME: this reflects existing client mappings, but should probably
     59     // be expanded to map higher level interpolations more accurately.
     60     return quality != InterpolationNone ? SkPaint::kLow_FilterLevel : SkPaint::kNone_FilterLevel;
     61 }
     62 
     63 // Skia has problems when passed infinite, etc floats, filter them to 0.
     64 inline SkScalar WebCoreFloatToSkScalar(float f)
     65 {
     66     return SkFloatToScalar(std::isfinite(f) ? f : 0);
     67 }
     68 
     69 inline SkScalar WebCoreDoubleToSkScalar(double d)
     70 {
     71     return SkDoubleToScalar(std::isfinite(d) ? d : 0);
     72 }
     73 
     74 inline SkRect WebCoreFloatRectToSKRect(const FloatRect& rect)
     75 {
     76     return SkRect::MakeLTRB(SkFloatToScalar(rect.x()), SkFloatToScalar(rect.y()),
     77         SkFloatToScalar(rect.maxX()), SkFloatToScalar(rect.maxY()));
     78 }
     79 
     80 inline bool WebCoreFloatNearlyEqual(float a, float b)
     81 {
     82     return SkScalarNearlyEqual(WebCoreFloatToSkScalar(a), WebCoreFloatToSkScalar(b));
     83 }
     84 
     85 inline SkPath::FillType WebCoreWindRuleToSkFillType(WindRule rule)
     86 {
     87     return static_cast<SkPath::FillType>(rule);
     88 }
     89 
     90 // Determine if a given WebKit point is contained in a path
     91 bool PLATFORM_EXPORT SkPathContainsPoint(const SkPath&, const FloatPoint&, SkPath::FillType);
     92 
     93 SkMatrix PLATFORM_EXPORT affineTransformToSkMatrix(const AffineTransform&);
     94 
     95 bool nearlyIntegral(float value);
     96 
     97 InterpolationQuality limitInterpolationQuality(const GraphicsContext*, InterpolationQuality resampling);
     98 
     99 InterpolationQuality computeInterpolationQuality(
    100     const SkMatrix&,
    101     float srcWidth,
    102     float srcHeight,
    103     float destWidth,
    104     float destHeight,
    105     bool isDataComplete = true);
    106 
    107 bool shouldDrawAntiAliased(const GraphicsContext*, const SkRect& destRect);
    108 
    109 } // namespace blink
    110 
    111 #endif  // SkiaUtils_h
    112