add helper makeShader for the common Clamp case

Bug: skia:
Change-Id: I22cac56f35fed16daede0cf1b3e34dfa6f5ae3ea
Reviewed-on: https://skia-review.googlesource.com/14625
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

12 files changed, 22 insertions, 36 deletions

diff --git a/gm/composeshader.cpp b/gm/composeshader.cpp
index ff525f4777..90fcedc970 100644
--- a/gm/composeshader.cpp
+++ b/gm/composeshader.cpp
@@ -247,13 +247,10 @@ DEF_SIMPLE_GM(composeshader_bitmap2, canvas, 200, 200) {
             SkColorType::kAlpha_8_SkColorType, kPremul_SkAlphaType);
     skMask.installPixels(imageInfo, dst8Storage.begin(), width, nullptr, nullptr, nullptr);
     sk_sp<SkImage> skSrc = SkImage::MakeFromBitmap(skBitmap);
-    sk_sp<SkShader> skSrcShader =
-        skSrc->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     sk_sp<SkImage> skMaskImage = SkImage::MakeFromBitmap(skMask);
-    sk_sp<SkShader> skMaskShader = skMaskImage->makeShader(
-        SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
     paint.setShader(
-        SkShader::MakeComposeShader(skMaskShader, skSrcShader, SkBlendMode::kSrcIn));
+        SkShader::MakeComposeShader(skMaskImage->makeShader(), skSrc->makeShader(),
+                                    SkBlendMode::kSrcIn));
     canvas->drawRect(r, paint);
 }
 
diff --git a/gm/croppedrects.cpp b/gm/croppedrects.cpp
index 0ea265c2fb..006e3d3dec 100644
--- a/gm/croppedrects.cpp
+++ b/gm/croppedrects.cpp
@@ -47,8 +47,7 @@ private:
         srcCanvas->drawRect(kSrcImageClip.makeInset(kStrokeWidth / 2, kStrokeWidth / 2), stroke);
 
         fSrcImage = srcSurface->makeImageSnapshot();
-        fSrcImageShader = fSrcImage->makeShader(SkShader::kClamp_TileMode,
-                                                SkShader::kClamp_TileMode);
+        fSrcImageShader = fSrcImage->makeShader();
     }
 
     void onDraw(SkCanvas* canvas) override {
diff --git a/gm/drawatlas.cpp b/gm/drawatlas.cpp
index d0609b5f57..de44b6d7a7 100644
--- a/gm/drawatlas.cpp
+++ b/gm/drawatlas.cpp
@@ -220,8 +220,7 @@ DEF_SIMPLE_GM(compare_atlas_vertices, canvas, 560, 585) {
                 canvas->drawAtlas(image, &xform, &tex, &color, 1,
                                   mode, &tex, &paint);
                 canvas->translate(128, 0);
-                paint.setShader(image->makeShader(SkShader::kClamp_TileMode,
-                                                  SkShader::kClamp_TileMode));
+                paint.setShader(image->makeShader());
                 canvas->drawVertices(verts, mode, paint);
                 paint.setShader(nullptr);
                 canvas->translate(145, 0);
diff --git a/gm/localmatriximageshader.cpp b/gm/localmatriximageshader.cpp
index 2c9fcd2601..f63497de83 100644
--- a/gm/localmatriximageshader.cpp
+++ b/gm/localmatriximageshader.cpp
@@ -28,8 +28,7 @@ DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
     SkMatrix translate = SkMatrix::MakeTrans(100.0f, 0.0f);
     SkMatrix rotate;
     rotate.setRotate(45.0f);
-    sk_sp<SkShader> redImageShader = redImage->makeShader(SkShader::TileMode::kClamp_TileMode,
-            SkShader::TileMode::kClamp_TileMode, &translate);
+    sk_sp<SkShader> redImageShader = redImage->makeShader(&translate);
     sk_sp<SkShader> redLocalMatrixShader = redImageShader->makeWithLocalMatrix(rotate);
 
     // Rotate about the origin will happen first.
@@ -38,8 +37,7 @@ DEF_SIMPLE_GM(localmatriximageshader, canvas, 250, 250) {
     canvas->drawIRect(SkIRect::MakeWH(250, 250), paint);
 
     sk_sp<SkImage> blueImage = make_image(canvas, SK_ColorBLUE);
-    sk_sp<SkShader> blueImageShader = blueImage->makeShader(SkShader::TileMode::kClamp_TileMode,
-            SkShader::TileMode::kClamp_TileMode, &rotate);
+    sk_sp<SkShader> blueImageShader = blueImage->makeShader(&rotate);
     sk_sp<SkShader> blueLocalMatrixShader = blueImageShader->makeWithLocalMatrix(translate);
 
     // Translate will happen first.
diff --git a/gm/rectangletexture.cpp b/gm/rectangletexture.cpp
index d4f4552e10..67ffa9a08c 100644
--- a/gm/rectangletexture.cpp
+++ b/gm/rectangletexture.cpp
@@ -163,8 +163,7 @@ protected:
 
                 SkPaint clampPaint;
                 clampPaint.setFilterQuality(q);
-                clampPaint.setShader(rectImg->makeShader(SkShader::kClamp_TileMode,
-                                                         SkShader::kClamp_TileMode));
+                clampPaint.setShader(rectImg->makeShader());
                 canvas->drawRect(SkRect::MakeWH(1.5f * kWidth, 1.5f * kHeight), clampPaint);
                 canvas->translate(kWidth * 1.5f + kPad, 0);
 
diff --git a/include/core/SkImage.h b/include/core/SkImage.h
index c52ad3d41e..1e5df0b116 100644
--- a/include/core/SkImage.h
+++ b/include/core/SkImage.h
@@ -252,6 +252,12 @@ public:
 
     sk_sp<SkShader> makeShader(SkShader::TileMode, SkShader::TileMode,
                                const SkMatrix* localMatrix = nullptr) const;
+    /**
+     *  Helper version of makeShader() that specifies Clamp tilemode.
+     */
+    sk_sp<SkShader> makeShader(const SkMatrix* localMatrix = nullptr) const {
+        return this->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode, localMatrix);
+    }
 
     /**
      *  If the image has direct access to its pixels (i.e. they are in local RAM)
diff --git a/samplecode/SampleFilterQuality.cpp b/samplecode/SampleFilterQuality.cpp
index 2c3eb4c11e..78aa20e1bc 100644
--- a/samplecode/SampleFilterQuality.cpp
+++ b/samplecode/SampleFilterQuality.cpp
@@ -29,10 +29,7 @@ static sk_sp<SkSurface> make_surface(SkCanvas* canvas, const SkImageInfo& info)
 
 static sk_sp<SkShader> make_shader(const SkRect& bounds) {
     sk_sp<SkImage> image(GetResourceAsImage("mandrill_128.png"));
-    if (!image) {
-        return nullptr;
-    }
-    return image->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
+    return image ? image->makeShader() : nullptr;
 }
 
 #define N   128
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 76b4a522b2..dc5f68fb80 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -2907,10 +2907,8 @@ void SkCanvas::onDrawShadowedPicture(const SkPicture* picture,
         diffuseMap = surf->makeImageSnapshot();
     }
 
-    sk_sp<SkShader> povDepthShader = povDepthMap->makeShader(SkShader::kClamp_TileMode,
-                                                             SkShader::kClamp_TileMode);
-    sk_sp<SkShader> diffuseShader = diffuseMap->makeShader(SkShader::kClamp_TileMode,
-                                                           SkShader::kClamp_TileMode);
+    sk_sp<SkShader> povDepthShader = povDepthMap->makeShader();
+    sk_sp<SkShader> diffuseShader = diffuseMap->makeShader();
 
     // TODO: pass the depth to the shader in vertices, or uniforms
     //       so we don't have to render depth and color separately
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 99a7a0c7ff..9d38e16d04 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -250,9 +250,7 @@ void SkBaseDevice::drawAtlas(const SkImage* atlas, const SkRSXform xform[],
         localM.preTranslate(-tex[i].left(), -tex[i].top());
 
         SkPaint pnt(paint);
-        sk_sp<SkShader> shader = atlas->makeShader(SkShader::kClamp_TileMode,
-                                                   SkShader::kClamp_TileMode,
-                                                   &localM);
+        sk_sp<SkShader> shader = atlas->makeShader(&localM);
         if (!shader) {
             break;
         }
diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 7a0585e0d0..5d996c8027 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1676,7 +1676,7 @@ void SkGpuDevice::drawAtlas(const SkImage* atlas, const SkRSXform xform[],
     GR_CREATE_TRACE_MARKER_CONTEXT("SkGpuDevice", "drawText", fContext.get());
 
     SkPaint p(paint);
-    p.setShader(atlas->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode));
+    p.setShader(atlas->makeShader());
 
     GrPaint grPaint;
     if (colors) {
diff --git a/tests/FlattenableFactoryToName.cpp b/tests/FlattenableFactoryToName.cpp
index 35ec98493f..fc47dfcb95 100644
--- a/tests/FlattenableFactoryToName.cpp
+++ b/tests/FlattenableFactoryToName.cpp
@@ -37,6 +37,5 @@ DEF_TEST(FlattenableFactoryToName, r) {
     bm.allocN32Pixels(8, 8);
     bm.eraseColor(SK_ColorCYAN);
     sk_sp<SkImage> image(SkImage::MakeFromBitmap(bm));
-    auto shader = image->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode);
-    test_flattenable(r, shader.get(), "SkImage::newShader()");
+    test_flattenable(r, image->makeShader().get(), "SkImage::newShader()");
 }
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index de4c6e0cbf..e53bd1ab64 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -426,8 +426,7 @@ Viewer::Viewer(int argc, char** argv, void* platformData)
     SkPixmap pmap(info, pixels, info.minRowBytes());
     SkMatrix localMatrix = SkMatrix::MakeScale(1.0f / w, 1.0f / h);
     auto fontImage = SkImage::MakeFromRaster(pmap, nullptr, nullptr);
-    auto fontShader = fontImage->makeShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode,
-                                            &localMatrix);
+    auto fontShader = fontImage->makeShader(&localMatrix);
     fImGuiFontPaint.setShader(fontShader);
     fImGuiFontPaint.setColor(SK_ColorWHITE);
     fImGuiFontPaint.setFilterQuality(kLow_SkFilterQuality);
@@ -435,9 +434,7 @@ Viewer::Viewer(int argc, char** argv, void* platformData)
 
     auto gamutImage = GetResourceAsImage("gamut.png");
     if (gamutImage) {
-        auto gamutShader = gamutImage->makeShader(SkShader::kClamp_TileMode,
-                                                  SkShader::kClamp_TileMode);
-        fImGuiGamutPaint.setShader(gamutShader);
+        fImGuiGamutPaint.setShader(gamutImage->makeShader());
     }
     fImGuiGamutPaint.setColor(SK_ColorWHITE);
     fImGuiGamutPaint.setFilterQuality(kLow_SkFilterQuality);
@@ -1152,8 +1149,7 @@ void Viewer::drawImGui(SkCanvas* canvas) {
             static int zoomFactor = 4;
             ImGui::SliderInt("Scale", &zoomFactor, 1, 16);
 
-            zoomImagePaint.setShader(fLastImage->makeShader(SkShader::kClamp_TileMode,
-                                                            SkShader::kClamp_TileMode));
+            zoomImagePaint.setShader(fLastImage->makeShader());
             zoomImagePaint.setColor(SK_ColorWHITE);
 
             // Zoom by shrinking the corner UVs towards the mouse cursor