From 10afbefa5b60b0f7e8d2b02f4c996de88aa26830 Mon Sep 17 00:00:00 2001
From: "mike@reedtribe.org"
 <mike@reedtribe.org@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Fri, 30 Dec 2011 16:02:53 +0000
Subject: [PATCH] add optional --forceBWtext to gm, forcing all text to BW to
 ease comparisons between platform variations (e.g. mac 10.5,6,7)

probably only make sense in conjunction with some flag on GM allowing
the slide to opt in-or-out, so we only hack text labels, and not GMs
that are explicitly trying to test text rendering.



git-svn-id: http://skia.googlecode.com/svn/trunk@2938 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 gm/gmmain.cpp | 38 +++++++++++++++++++++++++++++++++-----
 1 file changed, 33 insertions(+), 5 deletions(-)

diff --git a/gm/gmmain.cpp b/gm/gmmain.cpp
index 8f78c41d24..0c41418c93 100644
--- a/gm/gmmain.cpp
+++ b/gm/gmmain.cpp
@@ -23,6 +23,8 @@
 #include "SkStream.h"
 #include "SkRefCnt.h"
 
+static bool gForceBWtext;
+
 extern bool gSkSuppressFontCachePurgeSpew;
 
 #ifdef SK_SUPPORT_PDF
@@ -240,6 +242,29 @@ static void setup_bitmap(const ConfigData& gRec, SkISize& size,
     bitmap->eraseColor(0);
 }
 
+#include "SkDrawFilter.h"
+class BWTextDrawFilter : public SkDrawFilter {
+public:
+    virtual void filter(SkPaint*, Type) SK_OVERRIDE;
+};
+void BWTextDrawFilter::filter(SkPaint* p, Type t) {
+    if (kText_Type == t) {
+        p->setAntiAlias(false);
+    }
+}
+
+static void installFilter(SkCanvas* canvas) {
+    if (gForceBWtext) {
+        canvas->setDrawFilter(new BWTextDrawFilter)->unref();
+    }
+}
+
+static void invokeGM(GM* gm, SkCanvas* canvas) {
+    installFilter(canvas);
+    gm->draw(canvas);
+    canvas->setDrawFilter(NULL);
+}
+
 static ErrorBitfield generate_image(GM* gm, const ConfigData& gRec,
                                     GrContext* context,
                                     GrRenderTarget* rt,
@@ -249,14 +274,14 @@ static ErrorBitfield generate_image(GM* gm, const ConfigData& gRec,
     SkCanvas canvas(*bitmap);
 
     if (gRec.fBackend == kRaster_Backend) {
-        gm->draw(&canvas);
+        invokeGM(gm, &canvas);
     } else {  // GPU
         if (NULL == context) {
             return ERROR_NO_GPU_CONTEXT;
         }
         SkGpuCanvas gc(context, rt);
         gc.setDevice(new SkGpuDevice(context, rt))->unref();
-        gm->draw(&gc);
+        invokeGM(gm, &gc);
         // the device is as large as the current rendertarget, so we explicitly
         // only readback the amount we expect (in size)
         // overwrite our previous allocation
@@ -272,6 +297,7 @@ static void generate_image_from_picture(GM* gm, const ConfigData& gRec,
     SkISize size = gm->getISize();
     setup_bitmap(gRec, size, bitmap);
     SkCanvas canvas(*bitmap);
+    installFilter(&canvas);
     canvas.drawPicture(*pict);
 }
 
@@ -284,7 +310,7 @@ static void generate_pdf(GM* gm, SkDynamicMemoryWStream& pdf) {
     SkAutoUnref aur(dev);
 
     SkCanvas c(dev);
-    gm->draw(&c);
+    invokeGM(gm, &c);
 
     SkPDFDocument doc;
     doc.appendPage(dev);
@@ -312,7 +338,7 @@ static void generate_xps(GM* gm, SkDynamicMemoryWStream& xps) {
     SkCanvas c(dev);
     dev->beginPortfolio(&xps);
     dev->beginSheet(unitsPerMeter, pixelsPerMeter, trimSize);
-    gm->draw(&c);
+    invokeGM(gm, &c);
     dev->endSheet();
     dev->endPortfolio();
 
@@ -420,7 +446,7 @@ static SkPicture* generate_new_picture(GM* gm) {
     // Pictures are refcounted so must be on heap
     SkPicture* pict = new SkPicture;
     SkCanvas* cv = pict->beginRecording(1000, 1000);
-    gm->draw(cv);
+    invokeGM(gm, cv);
     pict->endRecording();
 
     return pict;
@@ -607,6 +633,8 @@ int main(int argc, char * const argv[]) {
             if (argv < stop && **argv) {
                 diffPath = *argv;
             }
+        } else if (strcmp(*argv, "--forceBWtext") == 0) {
+            gForceBWtext = true;
         } else if (strcmp(*argv, "--noreplay") == 0) {
             doReplay = false;
         } else if (strcmp(*argv, "--nopdf") == 0) {