1 files changed, 165 insertions, 0 deletions
diff --git a/Source/WebKit2/UIProcess/gtk/AcceleratedBackingStoreWayland.cpp b/Source/WebKit2/UIProcess/gtk/AcceleratedBackingStoreWayland.cpp
new file mode 100644
index 000000000..12e03c43f
--- /dev/null
+++ b/Source/WebKit2/UIProcess/gtk/AcceleratedBackingStoreWayland.cpp
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2016 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 COMPUTER, INC. ``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 COMPUTER, INC. OR
+ * 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 "AcceleratedBackingStoreWayland.h"
+
+#if PLATFORM(WAYLAND) && USE(EGL)
+
+#include "WaylandCompositor.h"
+#include "WebPageProxy.h"
+#include <WebCore/CairoUtilities.h>
+#include <WebCore/RefPtrCairo.h>
+
+#if USE(OPENGL_ES_2)
+#include <GLES2/gl2.h>
+#else
+#include <WebCore/OpenGLShims.h>
+#endif
+
+using namespace WebCore;
+
+namespace WebKit {
+
+std::unique_ptr<AcceleratedBackingStoreWayland> AcceleratedBackingStoreWayland::create(WebPageProxy& webPage)
+{
+    if (!WaylandCompositor::singleton().isRunning())
+        return nullptr;
+    return std::unique_ptr<AcceleratedBackingStoreWayland>(new AcceleratedBackingStoreWayland(webPage));
+}
+
+AcceleratedBackingStoreWayland::AcceleratedBackingStoreWayland(WebPageProxy& webPage)
+    : AcceleratedBackingStore(webPage)
+{
+    WaylandCompositor::singleton().registerWebPage(m_webPage);
+}
+
+AcceleratedBackingStoreWayland::~AcceleratedBackingStoreWayland()
+{
+    WaylandCompositor::singleton().unregisterWebPage(m_webPage);
+}
+
+#if GTK_CHECK_VERSION(3, 16, 0)
+bool AcceleratedBackingStoreWayland::canGdkUseGL() const
+{
+    static bool initialized = false;
+    static bool canCreateGLContext = false;
+
+    if (initialized)
+        return canCreateGLContext;
+
+    initialized = true;
+
+    GUniqueOutPtr<GError> error;
+    GdkWindow* gdkWindow = gtk_widget_get_window(m_webPage.viewWidget());
+    GRefPtr<GdkGLContext> gdkContext(gdk_window_create_gl_context(gdkWindow, &error.outPtr()));
+    if (!gdkContext) {
+        g_warning("GDK is not able to create a GL context, falling back to glReadPixels (slow!): %s", error->message);
+        return false;
+    }
+
+    canCreateGLContext = true;
+
+    return true;
+}
+#endif
+
+bool AcceleratedBackingStoreWayland::paint(cairo_t* cr, const IntRect& clipRect)
+{
+    GLuint texture;
+    IntSize textureSize;
+    if (!WaylandCompositor::singleton().getTexture(m_webPage, texture, textureSize))
+        return false;
+
+    cairo_save(cr);
+    AcceleratedBackingStore::paint(cr, clipRect);
+
+#if GTK_CHECK_VERSION(3, 16, 0)
+    if (canGdkUseGL()) {
+        gdk_cairo_draw_from_gl(cr, gtk_widget_get_window(m_webPage.viewWidget()), texture, GL_TEXTURE, m_webPage.deviceScaleFactor(), 0, 0, textureSize.width(), textureSize.height());
+        cairo_restore(cr);
+        return true;
+    }
+#endif
+
+    if (!m_surface || cairo_image_surface_get_width(m_surface.get()) != textureSize.width() || cairo_image_surface_get_height(m_surface.get()) != textureSize.height())
+        m_surface = adoptRef(cairo_image_surface_create(CAIRO_FORMAT_ARGB32, textureSize.width(), textureSize.height()));
+
+    cairoSurfaceSetDeviceScale(m_surface.get(), m_webPage.deviceScaleFactor(), m_webPage.deviceScaleFactor());
+
+    GLuint fb;
+    glGenFramebuffers(1, &fb);
+    glBindFramebuffer(GL_FRAMEBUFFER, fb);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture, 0);
+
+    glPixelStorei(GL_PACK_ALIGNMENT, 4);
+
+#if USE(OPENGL_ES_2)
+    unsigned char* data = cairo_image_surface_get_data(m_surface.get());
+    if (cairo_image_surface_get_stride(m_surface.get()) == textureSize.width() * 4)
+        glReadPixels(0, 0, textureSize.width(), textureSize.height(), GL_RGBA, GL_UNSIGNED_BYTE, data);
+    else {
+        int strideBytes = cairo_image_surface_get_stride(m_surface.get());
+        for (int i = 0; i < textureSize.height(); i++) {
+            unsigned char* dataOffset = data + i * strideBytes;
+            glReadPixels(0, i, textureSize.width(), 1, GL_RGBA, GL_UNSIGNED_BYTE, dataOffset);
+        }
+    }
+
+    // Convert to BGRA.
+    int totalBytes = textureSize.width() * textureSize.height() * 4;
+    for (int i = 0; i < totalBytes; i += 4)
+        std::swap(data[i], data[i + 2]);
+#else
+    glPixelStorei(GL_PACK_ROW_LENGTH, cairo_image_surface_get_stride(m_surface.get()) / 4);
+    glReadPixels(0, 0, textureSize.width(), textureSize.height(), GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, cairo_image_surface_get_data(m_surface.get()));
+    glPixelStorei(GL_PACK_ROW_LENGTH, 0);
+#endif
+
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glDeleteFramebuffers(1, &fb);
+
+    // The surface can be modified by the web process at any time, so we mark it
+    // as dirty to ensure we always render the updated contents as soon as possible.
+    cairo_surface_mark_dirty(m_surface.get());
+
+    // The compositor renders the texture flipped for gdk_cairo_draw_from_gl, fix that here.
+    cairo_matrix_t transform;
+    cairo_matrix_init(&transform, 1, 0, 0, -1, 0, textureSize.height() / m_webPage.deviceScaleFactor());
+    cairo_transform(cr, &transform);
+
+    cairo_rectangle(cr, clipRect.x(), clipRect.y(), clipRect.width(), clipRect.height());
+    cairo_set_source_surface(cr, m_surface.get(), 0, 0);
+    cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+    cairo_fill(cr);
+
+    cairo_restore(cr);
+
+    return true;
+}
+
+} // namespace WebKit
+
+#endif // PLATFORM(WAYLAND) && USE(EGL)