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// Copyright (c) 2009 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 "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 "gfx/rect.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkUnPreMultiply.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);
}
// Common implementation of ConvertAcceleratorsFromWindowsStyle() and
// RemoveWindowsStyleAccelerators().
// Replaces all ampersands (as used in our grd files to indicate mnemonics)
// to |target|. Similarly any underscores get replaced with two underscores as
// is needed by pango.
std::string ConvertAmperstandsTo(const std::string& label,
const std::string& target) {
std::string ret;
ret.reserve(label.length() * 2);
for (size_t i = 0; i < label.length(); ++i) {
if ('_' == label[i]) {
ret.push_back('_');
ret.push_back('_');
} else if ('&' == label[i]) {
if (i + 1 < label.length() && '&' == label[i + 1]) {
ret.push_back('&');
++i;
} else {
ret.append(target);
}
} else {
ret.push_back(label[i]);
}
}
return ret;
}
} // 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);
}
}
double GetPangoResolution() {
static double resolution;
static bool determined_resolution = false;
if (!determined_resolution) {
determined_resolution = true;
PangoContext* default_context = gdk_pango_context_get();
resolution = pango_cairo_context_get_resolution(default_context);
#if !defined(OS_CHROMEOS)
// Until we switch to vector graphics, force the max DPI to 96.0.
resolution = std::min(resolution, 96.);
#endif
g_object_unref(default_context);
}
return resolution;
}
GdkCursor* GetCursor(int type) {
static GdkCursorCache impl;
return impl.GetCursorImpl(static_cast<GdkCursorType>(type));
}
std::string ConvertAcceleratorsFromWindowsStyle(const std::string& label) {
return ConvertAmperstandsTo(label, "_");
}
std::string RemoveWindowsStyleAccelerators(const std::string& label) {
return ConvertAmperstandsTo(label, "");
}
uint8_t* BGRAToRGBA(const uint8_t* pixels, int width, int height, int stride) {
if (stride == 0)
stride = width * 4;
uint8_t* new_pixels = static_cast<uint8_t*>(malloc(height * stride));
// We have to copy the pixels and swap from BGRA to RGBA.
for (int i = 0; i < height; ++i) {
for (int j = 0; j < width; ++j) {
int idx = i * stride + j * 4;
new_pixels[idx] = pixels[idx + 2];
new_pixels[idx + 1] = pixels[idx + 1];
new_pixels[idx + 2] = pixels[idx];
new_pixels[idx + 3] = pixels[idx + 3];
}
}
return new_pixels;
}
} // namespace gfx
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