webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 114 insertions, 0 deletions

diff --git a/Source/WebCore/platform/graphics/texmap/BitmapTexturePool.cpp b/Source/WebCore/platform/graphics/texmap/BitmapTexturePool.cpp
new file mode 100644
index 000000000..00cc8ee36
--- /dev/null
+++ b/Source/WebCore/platform/graphics/texmap/BitmapTexturePool.cpp
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
+ * Copyright (C) 2015 Igalia S.L.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "BitmapTexturePool.h"
+
+#if USE(TEXTURE_MAPPER_GL)
+#include "BitmapTextureGL.h"
+#endif
+
+namespace WebCore {
+
+static const double s_releaseUnusedSecondsTolerance = 3;
+static const double s_releaseUnusedTexturesTimerInterval = 0.5;
+
+#if USE(TEXTURE_MAPPER_GL)
+BitmapTexturePool::BitmapTexturePool(RefPtr<GraphicsContext3D>&& context3D)
+    : m_context3D(WTFMove(context3D))
+    , m_releaseUnusedTexturesTimer(*this, &BitmapTexturePool::releaseUnusedTexturesTimerFired)
+{
+}
+#endif
+
+RefPtr<BitmapTexture> BitmapTexturePool::acquireTexture(const IntSize& size, const BitmapTexture::Flags flags)
+{
+    Vector<Entry>& list = flags & BitmapTexture::FBOAttachment ? m_attachmentTextures : m_textures;
+
+    Entry* selectedEntry = std::find_if(list.begin(), list.end(),
+        [&size](Entry& entry) { return entry.m_texture->refCount() == 1 && entry.m_texture->size() == size; });
+
+    if (selectedEntry == list.end()) {
+        list.append(Entry(createTexture(flags)));
+        selectedEntry = &list.last();
+    }
+
+    scheduleReleaseUnusedTextures();
+    selectedEntry->markIsInUse();
+    return selectedEntry->m_texture.copyRef();
+}
+
+void BitmapTexturePool::scheduleReleaseUnusedTextures()
+{
+    if (m_releaseUnusedTexturesTimer.isActive())
+        return;
+
+    m_releaseUnusedTexturesTimer.startOneShot(s_releaseUnusedTexturesTimerInterval);
+}
+
+void BitmapTexturePool::releaseUnusedTexturesTimerFired()
+{
+    // Delete entries, which have been unused in s_releaseUnusedSecondsTolerance.
+    double minUsedTime = monotonicallyIncreasingTime() - s_releaseUnusedSecondsTolerance;
+
+    if (!m_textures.isEmpty()) {
+        std::sort(m_textures.begin(), m_textures.end(),
+            [](const Entry& a, const Entry& b) { return a.m_lastUsedTime > b.m_lastUsedTime; });
+
+        for (size_t i = 0; i < m_textures.size(); ++i) {
+            if (m_textures[i].m_lastUsedTime < minUsedTime) {
+                m_textures.remove(i, m_textures.size() - i);
+                break;
+            }
+        }
+    }
+
+    if (!m_attachmentTextures.isEmpty()) {
+        std::sort(m_attachmentTextures.begin(), m_attachmentTextures.end(),
+            [](const Entry& a, const Entry& b) { return a.m_lastUsedTime > b.m_lastUsedTime; });
+
+        for (size_t i = 0; i < m_attachmentTextures.size(); ++i) {
+            if (m_attachmentTextures[i].m_lastUsedTime < minUsedTime) {
+                m_attachmentTextures.remove(i, m_attachmentTextures.size() - i);
+                break;
+            }
+        }
+    }
+
+    if (!m_textures.isEmpty() || !m_attachmentTextures.isEmpty())
+        scheduleReleaseUnusedTextures();
+}
+
+RefPtr<BitmapTexture> BitmapTexturePool::createTexture(const BitmapTexture::Flags flags)
+{
+#if USE(TEXTURE_MAPPER_GL)
+    return BitmapTextureGL::create(*m_context3D, flags);
+#else
+    return nullptr;
+#endif
+}
+
+} // namespace WebCore