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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/gtk_util.h"
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <stdlib.h>
#include "base/basictypes.h"
#include "base/command_line.h"
#include "base/linux_util.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkUnPreMultiply.h"
#include "ui/gfx/rect.h"
namespace {
// A process wide singleton that manages our usage of gdk
// cursors. gdk_cursor_new() hits the disk in several places and GdkCursor
// instances can be reused throughout the process.
class GdkCursorCache {
public:
GdkCursorCache() {}
~GdkCursorCache() {
for (std::map<GdkCursorType, GdkCursor*>::iterator it =
cursor_cache_.begin(); it != cursor_cache_.end(); ++it) {
gdk_cursor_unref(it->second);
}
cursor_cache_.clear();
}
GdkCursor* GetCursorImpl(GdkCursorType type) {
std::map<GdkCursorType, GdkCursor*>::iterator it = cursor_cache_.find(type);
GdkCursor* cursor = NULL;
if (it == cursor_cache_.end()) {
cursor = gdk_cursor_new(type);
cursor_cache_.insert(std::make_pair(type, cursor));
} else {
cursor = it->second;
}
// It is not necessary to add a reference here. The callers can ref the
// cursor if they need it for something.
return cursor;
}
std::map<GdkCursorType, GdkCursor*> cursor_cache_;
DISALLOW_COPY_AND_ASSIGN(GdkCursorCache);
};
void FreePixels(guchar* pixels, gpointer data) {
free(data);
}
} // namespace
namespace gfx {
void GtkInitFromCommandLine(const CommandLine& command_line) {
const std::vector<std::string>& args = command_line.argv();
int argc = args.size();
scoped_array<char *> argv(new char *[argc + 1]);
for (size_t i = 0; i < args.size(); ++i) {
// TODO(piman@google.com): can gtk_init modify argv? Just being safe
// here.
argv[i] = strdup(args[i].c_str());
}
argv[argc] = NULL;
char **argv_pointer = argv.get();
gtk_init(&argc, &argv_pointer);
for (size_t i = 0; i < args.size(); ++i) {
free(argv[i]);
}
}
GdkPixbuf* GdkPixbufFromSkBitmap(const SkBitmap* bitmap) {
if (bitmap->isNull())
return NULL;
bitmap->lockPixels();
int width = bitmap->width();
int height = bitmap->height();
int stride = bitmap->rowBytes();
// SkBitmaps are premultiplied, we need to unpremultiply them.
const int kBytesPerPixel = 4;
uint8* divided = static_cast<uint8*>(malloc(height * stride));
for (int y = 0, i = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
uint32 pixel = bitmap->getAddr32(0, y)[x];
int alpha = SkColorGetA(pixel);
if (alpha != 0 && alpha != 255) {
SkColor unmultiplied = SkUnPreMultiply::PMColorToColor(pixel);
divided[i + 0] = SkColorGetR(unmultiplied);
divided[i + 1] = SkColorGetG(unmultiplied);
divided[i + 2] = SkColorGetB(unmultiplied);
divided[i + 3] = alpha;
} else {
divided[i + 0] = SkColorGetR(pixel);
divided[i + 1] = SkColorGetG(pixel);
divided[i + 2] = SkColorGetB(pixel);
divided[i + 3] = alpha;
}
i += kBytesPerPixel;
}
}
// This pixbuf takes ownership of our malloc()ed data and will
// free it for us when it is destroyed.
GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(
divided,
GDK_COLORSPACE_RGB, // The only colorspace gtk supports.
true, // There is an alpha channel.
8,
width, height, stride, &FreePixels, divided);
bitmap->unlockPixels();
return pixbuf;
}
void SubtractRectanglesFromRegion(GdkRegion* region,
const std::vector<Rect>& cutouts) {
for (size_t i = 0; i < cutouts.size(); ++i) {
GdkRectangle rect = cutouts[i].ToGdkRectangle();
GdkRegion* rect_region = gdk_region_rectangle(&rect);
gdk_region_subtract(region, rect_region);
// TODO(deanm): It would be nice to be able to reuse the GdkRegion here.
gdk_region_destroy(rect_region);
}
}
GdkCursor* GetCursor(int type) {
CR_DEFINE_STATIC_LOCAL(GdkCursorCache, impl, ());
return impl.GetCursorImpl(static_cast<GdkCursorType>(type));
}
#if !defined(USE_WAYLAND) && !defined(USE_AURA)
PangoContext* GetPangoContext() {
return gdk_pango_context_get();
}
#endif
void InitRCStyles() {
static const char kRCText[] =
// Make our dialogs styled like the GNOME HIG.
//
// TODO(evanm): content-area-spacing was introduced in a later
// version of GTK, so we need to set that manually on all dialogs.
// Perhaps it would make sense to have a shared FixupDialog() function.
"style \"gnome-dialog\" {\n"
" xthickness = 12\n"
" GtkDialog::action-area-border = 0\n"
" GtkDialog::button-spacing = 6\n"
" GtkDialog::content-area-spacing = 18\n"
" GtkDialog::content-area-border = 12\n"
"}\n"
// Note we set it at the "application" priority, so users can override.
"widget \"GtkDialog\" style : application \"gnome-dialog\"\n"
// Make our about dialog special, so the image is flush with the edge.
"style \"about-dialog\" {\n"
" GtkDialog::action-area-border = 12\n"
" GtkDialog::button-spacing = 6\n"
" GtkDialog::content-area-spacing = 18\n"
" GtkDialog::content-area-border = 0\n"
"}\n"
"widget \"about-dialog\" style : application \"about-dialog\"\n";
gtk_rc_parse_string(kRCText);
}
} // namespace gfx
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