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+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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+// Use of this source code is governed by a BSD-style license that can be
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+// found in the LICENSE file.
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+
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+#include "ui/gfx/gtk_util.h"
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+
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+#include <gdk/gdk.h>
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+#include <gtk/gtk.h>
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+#include <stdlib.h>
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+
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+#include "base/basictypes.h"
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+#include "base/command_line.h"
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+#include "base/memory/scoped_ptr.h"
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+#include "third_party/skia/include/core/SkBitmap.h"
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+#include "third_party/skia/include/core/SkUnPreMultiply.h"
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+#include "ui/gfx/rect.h"
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+
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+namespace {
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+
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+// A process wide singleton that manages our usage of gdk cursors.
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+// gdk_cursor_new() hits the disk in several places and GdkCursor instances can
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+// be reused throughout the process.
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+class GdkCursorCache {
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+ public:
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+ GdkCursorCache() {}
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+ ~GdkCursorCache() {
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+ for (GdkCursorMap::iterator i(cursors_.begin()); i != cursors_.end(); ++i) {
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+ gdk_cursor_unref(i->second);
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+ }
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+ cursors_.clear();
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+ }
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+
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+ GdkCursor* GetCursorImpl(GdkCursorType type) {
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+ GdkCursorMap::iterator it = cursors_.find(type);
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+ GdkCursor* cursor = NULL;
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+ if (it == cursors_.end()) {
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+ cursor = gdk_cursor_new(type);
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+ cursors_.insert(std::make_pair(type, cursor));
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+ } else {
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+ cursor = it->second;
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+ }
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+
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+ // It is not necessary to add a reference here. The callers can ref the
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+ // cursor if they need it for something.
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+ return cursor;
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+ }
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+
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+ private:
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+ typedef std::map<GdkCursorType, GdkCursor*> GdkCursorMap;
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+ GdkCursorMap cursors_;
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+
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+ DISALLOW_COPY_AND_ASSIGN(GdkCursorCache);
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+};
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+
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+} // namespace
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+
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+namespace gfx {
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+
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+static void CommonInitFromCommandLine(const CommandLine& command_line,
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+ void (*init_func)(gint*, gchar***)) {
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+ const std::vector<std::string>& args = command_line.argv();
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+ int argc = args.size();
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+ scoped_ptr<char *[]> argv(new char *[argc + 1]);
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+ for (size_t i = 0; i < args.size(); ++i) {
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+ // TODO([email protected]): can gtk_init modify argv? Just being safe
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+ // here.
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+ argv[i] = strdup(args[i].c_str());
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+ }
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+ argv[argc] = NULL;
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+ char **argv_pointer = argv.get();
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+
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+ init_func(&argc, &argv_pointer);
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+ for (size_t i = 0; i < args.size(); ++i) {
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+ free(argv[i]);
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+ }
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+}
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+
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+void GtkInitFromCommandLine(const CommandLine& command_line) {
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+ CommonInitFromCommandLine(command_line, gtk_init);
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+}
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+
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+void GdkInitFromCommandLine(const CommandLine& command_line) {
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+ CommonInitFromCommandLine(command_line, gdk_init);
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+}
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+
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+GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap& bitmap) {
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+ if (bitmap.isNull())
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+ return NULL;
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+
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+ SkAutoLockPixels lock_pixels(bitmap);
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+
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+ int width = bitmap.width();
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+ int height = bitmap.height();
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+
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+ GdkPixbuf* pixbuf = gdk_pixbuf_new(
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+ GDK_COLORSPACE_RGB, // The only colorspace gtk supports.
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+ TRUE, // There is an alpha channel.
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+ 8,
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+ width, height);
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+
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+ // SkBitmaps are premultiplied, we need to unpremultiply them.
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+ const int kBytesPerPixel = 4;
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+ uint8* divided = gdk_pixbuf_get_pixels(pixbuf);
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+
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+ for (int y = 0, i = 0; y < height; y++) {
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+ for (int x = 0; x < width; x++) {
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+ uint32 pixel = bitmap.getAddr32(0, y)[x];
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+
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+ int alpha = SkColorGetA(pixel);
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+ if (alpha != 0 && alpha != 255) {
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+ SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel);
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+ divided[i + 0] = SkColorGetR(unmultiplied);
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+ divided[i + 1] = SkColorGetG(unmultiplied);
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+ divided[i + 2] = SkColorGetB(unmultiplied);
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+ divided[i + 3] = alpha;
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+ } else {
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+ divided[i + 0] = SkColorGetR(pixel);
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+ divided[i + 1] = SkColorGetG(pixel);
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+ divided[i + 2] = SkColorGetB(pixel);
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+ divided[i + 3] = alpha;
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+ }
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+ i += kBytesPerPixel;
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+ }
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+ }
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+
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+ return pixbuf;
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+}
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+
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+void SubtractRectanglesFromRegion(GdkRegion* region,
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+ const std::vector<Rect>& cutouts) {
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+ for (size_t i = 0; i < cutouts.size(); ++i) {
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+ GdkRectangle rect = {
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+ cutouts[i].x(), cutouts[i].y(), cutouts[i].width(), cutouts[i].height()
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+ };
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+ GdkRegion* rect_region = gdk_region_rectangle(&rect);
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+ gdk_region_subtract(region, rect_region);
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+ // TODO(deanm): It would be nice to be able to reuse the GdkRegion here.
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+ gdk_region_destroy(rect_region);
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+ }
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+}
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+
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+GdkCursor* GetCursor(int type) {
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+ CR_DEFINE_STATIC_LOCAL(GdkCursorCache, impl, ());
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+ return impl.GetCursorImpl(static_cast<GdkCursorType>(type));
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+}
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+
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+void InitRCStyles() {
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+ static const char kRCText[] =
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+ // Make our dialogs styled like the GNOME HIG.
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+ //
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+ // TODO(evanm): content-area-spacing was introduced in a later
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+ // version of GTK, so we need to set that manually on all dialogs.
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+ // Perhaps it would make sense to have a shared FixupDialog() function.
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+ "style \"gnome-dialog\" {\n"
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+ " xthickness = 12\n"
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+ " GtkDialog::action-area-border = 0\n"
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+ " GtkDialog::button-spacing = 6\n"
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+ " GtkDialog::content-area-spacing = 18\n"
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+ " GtkDialog::content-area-border = 12\n"
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+ "}\n"
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+ // Note we set it at the "application" priority, so users can override.
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+ "widget \"GtkDialog\" style : application \"gnome-dialog\"\n"
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+
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+ // Make our about dialog special, so the image is flush with the edge.
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+ "style \"about-dialog\" {\n"
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+ " GtkDialog::action-area-border = 12\n"
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+ " GtkDialog::button-spacing = 6\n"
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+ " GtkDialog::content-area-spacing = 18\n"
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+ " GtkDialog::content-area-border = 0\n"
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+ "}\n"
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+ "widget \"about-dialog\" style : application \"about-dialog\"\n";
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+
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+ gtk_rc_parse_string(kRCText);
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+}
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+
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+base::TimeDelta GetCursorBlinkCycle() {
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+ // From http://library.gnome.org/devel/gtk/unstable/GtkSettings.html, this is
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+ // the default value for gtk-cursor-blink-time.
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+ static const gint kGtkDefaultCursorBlinkTime = 1200;
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+
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+ gint cursor_blink_time = kGtkDefaultCursorBlinkTime;
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+ gboolean cursor_blink = TRUE;
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+ g_object_get(gtk_settings_get_default(),
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+ "gtk-cursor-blink-time", &cursor_blink_time,
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+ "gtk-cursor-blink", &cursor_blink,
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+ NULL);
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+ return cursor_blink ?
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+ base::TimeDelta::FromMilliseconds(cursor_blink_time) :
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+ base::TimeDelta();
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+}
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+
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+} // namespace gfx
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