Refactor SkCanvas so that backends don't need to override it.

Methods or classes that should go away are marked deprecated. The only thing I know of that breaks backward compatibility is SkCanvas((SkDevice*)NULL), but that is fairly unlikely to occur in the wild because that constructor had a default value of NULL.

Review URL: http://codereview.appspot.com/2103045

git-svn-id: http://skia.googlecode.com/svn/trunk@604 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 140 insertions, 0 deletions

diff --git a/src/gl/SkGLDevice.cpp b/src/gl/SkGLDevice.cpp
index d839498dec..ad4377c618 100644
--- a/src/gl/SkGLDevice.cpp
+++ b/src/gl/SkGLDevice.cpp
@@ -4,6 +4,19 @@
 #include "SkRegion.h"
 #include "SkThread.h"
 
+#ifdef SK_GL_DEVICE_FBO
+    #define USE_FBO_DEVICE
+    #include "SkGLDevice_FBO.h"
+#else
+    #define USE_SWLAYER_DEVICE
+    #include "SkGLDevice_SWLayer.h"
+#endif
+
+// maximum number of entries in our texture cache (before purging)
+#define kTexCountMax_Default    256
+// maximum number of bytes used (by gl) for the texture cache (before purging)
+#define kTexSizeMax_Default     (4 * 1024 * 1024)
+
 static void TRACE_DRAW(const char func[], SkGLDevice* device,
                        const SkDraw& draw) {
     //    SkDebugf("--- <%s> %p %p\n", func, canvas, draw.fDevice);
@@ -69,8 +82,39 @@ private:
 
 ///////////////////////////////////////////////////////////////////////////////
 
+SkDevice* SkGLDeviceFactory::newDevice(SkBitmap::Config config, int width,
+                                       int height, bool isOpaque,
+                                       bool isForLayer) {
+    SkBitmap bitmap;
+
+    bitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height);
+    bitmap.setIsOpaque(isOpaque);
+
+#ifdef USE_FBO_DEVICE
+    return SkNEW_ARGS(SkGLDevice_FBO, (bitmap, isForLayer));
+#elif defined(USE_SWLAYER_DEVICE)
+    if (isForLayer) {
+        bitmap.allocPixels();
+        if (!bitmap.isOpaque()) {
+            bitmap.eraseColor(0);
+        }
+        return SkNEW_ARGS(SkGLDevice_SWLayer, (bitmap));
+    } else {
+        return SkNEW_ARGS(SkGLDevice, (bitmap, isForLayer));
+    }
+#else
+    return SkNEW_ARGS(SkGLDevice, (bitmap, isForLayer));
+#endif
+}
+
 SkGLDevice::SkGLDevice(const SkBitmap& bitmap, bool offscreen)
         : SkDevice(bitmap), fClipIter(bitmap.height()) {
+    glEnable(GL_TEXTURE_2D);
+    glEnable(GL_SCISSOR_TEST);
+    glEnableClientState(GL_VERTEX_ARRAY);
+
+    glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
+
     fDrawProcs = NULL;
 }
 
@@ -811,3 +855,99 @@ void SkGLDevice::drawTextOnPath(const SkDraw& draw, const void* text,
     SkGL_unimpl("drawTextOnPath");
 }
 
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkTextureCache.h"
+#include "SkThread.h"
+
+static SkMutex gTextureCacheMutex;
+static SkTextureCache gTextureCache(kTexCountMax_Default, kTexSizeMax_Default);
+
+SkGLDevice::TexCache* SkGLDevice::LockTexCache(const SkBitmap& bitmap,
+                                                 GLuint* name, SkPoint* size) {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+
+    SkTextureCache::Entry* entry = gTextureCache.lock(bitmap);
+    if (NULL != entry) {
+        if (name) {
+            *name = entry->name();
+        }
+        if (size) {
+            *size = entry->texSize();
+        }
+    }
+    return (TexCache*)entry;
+}
+
+void SkGLDevice::UnlockTexCache(TexCache* cache) {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+    gTextureCache.unlock((SkTextureCache::Entry*)cache);
+}
+
+// public exposure of texture cache settings
+
+size_t SkGLDevice::GetTextureCacheMaxCount() {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+    return gTextureCache.getMaxCount();
+}
+
+size_t SkGLDevice::GetTextureCacheMaxSize() {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+    return gTextureCache.getMaxSize();
+}
+
+void SkGLDevice::SetTextureCacheMaxCount(size_t count) {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+    gTextureCache.setMaxCount(count);
+}
+
+void SkGLDevice::SetTextureCacheMaxSize(size_t size) {
+    SkAutoMutexAcquire amc(gTextureCacheMutex);
+    gTextureCache.setMaxSize(size);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkGLTextCache.h"
+
+static bool deleteCachesProc(SkGlyphCache* cache, void* texturesAreValid) {
+    void* auxData;
+    if (cache->getAuxProcData(SkGLDevice::GlyphCacheAuxProc, &auxData)) {
+        bool valid = texturesAreValid != NULL;
+        SkGLTextCache* textCache = static_cast<SkGLTextCache*>(auxData);
+        // call this before delete, in case valid is false
+        textCache->deleteAllStrikes(valid);
+        // now free the memory for the cache itself
+        SkDELETE(textCache);
+        // now remove the entry in the glyphcache (does not call the proc)
+        cache->removeAuxProc(SkGLDevice::GlyphCacheAuxProc);
+    }
+    return false;   // keep going
+}
+
+void SkGLDevice::DeleteAllTextures() {
+    // free the textures in our cache
+
+    gTextureCacheMutex.acquire();
+    gTextureCache.deleteAllCaches(true);
+    gTextureCacheMutex.release();
+
+    // now free the textures in the font cache
+
+    SkGlyphCache::VisitAllCaches(deleteCachesProc, reinterpret_cast<void*>(true)
+);
+}
+
+void SkGLDevice::AbandonAllTextures() {
+    // abandon the textures in our cache
+
+    gTextureCacheMutex.acquire();
+    gTextureCache.deleteAllCaches(false);
+    gTextureCacheMutex.release();
+
+    // abandon the textures in the font cache
+
+    SkGlyphCache::VisitAllCaches(deleteCachesProc, reinterpret_cast<void*>(false
+));
+}
+