From e04e92b19f050892c2770da955e4c931e0ef698b Mon Sep 17 00:00:00 2001
From: "reed@google.com" <reed@google.com@2bbb7eff-a529-9590-31e7-b0007b416f81>
Date: Thu, 13 Sep 2012 17:44:32 +0000
Subject: To avoid running out of memory, we rescale very large pictures before
 we render them. Review URL: https://codereview.appspot.com/6504045

git-svn-id: http://skia.googlecode.com/svn/trunk@5530 2bbb7eff-a529-9590-31e7-b0007b416f81
---
 tools/render_pictures_main.cpp | 44 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

(limited to 'tools/render_pictures_main.cpp')

diff --git a/tools/render_pictures_main.cpp b/tools/render_pictures_main.cpp
index 5ec2ede3e7..613ec94c03 100644
--- a/tools/render_pictures_main.cpp
+++ b/tools/render_pictures_main.cpp
@@ -89,6 +89,27 @@ static void write_output(const SkString& outputDir, const SkString& inputFilenam
     }
 }
 
+static bool area_too_big(int w, int h, SkISize* newSize) {
+    // just a guess, based on what seems to fail on smaller android devices
+    static const int64_t kMaxAreaForMemory = 16 * 1024 * 1024;
+
+    if ((int64_t)w * h > kMaxAreaForMemory) {
+        do {
+            w >>= 1;
+            h >>= 1;
+        } while ((int64_t)w * h > kMaxAreaForMemory);
+        if (0 == w) {
+            w = 1;
+        }
+        if (0 == h) {
+            h = 1;
+        }
+        newSize->set(w, h);
+        return true;
+    }
+    return false;
+}
+
 static void render_picture(const SkString& inputPath, const SkString& outputDir,
                            sk_tools::PictureRenderer& renderer) {
     SkString inputFilename;
@@ -105,7 +126,28 @@ static void render_picture(const SkString& inputPath, const SkString& outputDir,
 
     SkDebugf("drawing... [%i %i] %s\n", picture.width(), picture.height(),
              inputPath.c_str());
-    renderer.init(&picture);
+    
+
+    // rescale to avoid memory issues allcoating a very large offscreen
+    SkPicture* pic = &picture;
+    SkISize newSize;
+    SkAutoUnref aur(NULL);
+
+    if (area_too_big(picture.width(), picture.height(), &newSize)) {
+        pic = new SkPicture;
+        aur.reset(pic);
+        
+        SkCanvas* canvas = pic->beginRecording(newSize.width(), newSize.height());
+        SkScalar scale = SkIntToScalar(newSize.width()) / picture.width();
+        canvas->scale(scale, scale);
+        canvas->drawPicture(picture);
+        pic->endRecording();
+        
+        SkDebugf("... rescaling to [%d %d] to avoid overly large allocations\n",
+                 newSize.width(), newSize.height());
+    }
+
+    renderer.init(pic);
 
     renderer.render(true);
 
-- 
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