add filterTextFlags() to SkDevice (virtual) to allow device subclasses to

filter what text features we try to use. The filtering allows for implementation
limitations to dictate when we turn off certain text features.



git-svn-id: http://skia.googlecode.com/svn/trunk@943 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 25 insertions, 0 deletions

diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 91a6319a17..3707b67119 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -1181,6 +1181,31 @@ void SkGpuDevice::drawTextOnPath(const SkDraw& draw, const void* text,
 
 ///////////////////////////////////////////////////////////////////////////////
 
+bool SkGpuDevice::filterTextFlags(const SkPaint& paint, TextFlags* flags) {
+    if (!paint.isLCDRenderText()) {
+        // we're cool with the paint as is
+        return false;
+    }
+
+    if (paint.getShader() ||
+        paint.getXfermode() || // unless its srcover
+        paint.getMaskFilter() ||
+        paint.getRasterizer() ||
+        paint.getColorFilter() ||
+        paint.getPathEffect() ||
+        paint.isFakeBoldText() ||
+        paint.getStyle() != SkPaint::kFill_Style) {
+        // turn off lcd
+        flags->fFlags = paint.getFlags() & ~SkPaint::kLCDRenderText_Flag;
+        flags->fHinting = paint.getHinting();
+        return true;
+    }
+    // we're cool with the paint as is
+    return false;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
 SkGpuDevice::TexCache* SkGpuDevice::lockCachedTexture(const SkBitmap& bitmap,
                                                   const GrSamplerState& sampler,
                                                   GrTexture** texture,