blob: 350c68d84d8d4efecd7db791bf0f3b4fdd19c83f [file] [log] [blame]
/*
* Copyright (C) 2006 Apple Computer, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "third_party/blink/renderer/platform/mac/local_current_graphics_context.h"
#include <AppKit/NSGraphicsContext.h>
#include "skia/ext/platform_canvas.h"
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/graphics/paint/paint_canvas.h"
#include "third_party/blink/renderer/platform/mac/theme_mac.h"
#include "third_party/skia/include/core/SkRegion.h"
namespace blink {
LocalCurrentGraphicsContext::LocalCurrentGraphicsContext(
GraphicsContext& graphics_context,
const IntRect& dirty_rect)
: LocalCurrentGraphicsContext(graphics_context.Canvas(),
graphics_context.DeviceScaleFactor(),
dirty_rect) {}
static const int kMaxDirtyRectPixelSize = 10000;
static SkIRect LocalToClampedDeviceRect(cc::PaintCanvas* canvas,
const IntRect& local) {
const SkMatrix& matrix = canvas->getTotalMatrix();
SkRect device;
if (!matrix.mapRect(&device, local))
return SkIRect();
// Constrain the maximum size of what we paint to something reasonable. This
// accordingly means we will not paint the entirety of truly huge native form
// elements, which is deemed an acceptable tradeoff for this simple approach
// to manage such an edge case.
SkIRect idevice = device.roundOut();
idevice.intersect(SkIRect::MakeXYWH(idevice.x(), idevice.y(),
kMaxDirtyRectPixelSize,
kMaxDirtyRectPixelSize));
return idevice;
}
LocalCurrentGraphicsContext::LocalCurrentGraphicsContext(
cc::PaintCanvas* canvas,
float device_scale_factor,
const IntRect& dirty_rect)
: did_set_graphics_context_(false),
inflated_dirty_rect_(ThemeMac::InflateRectForAA(dirty_rect)),
graphics_context_canvas_(
canvas,
LocalToClampedDeviceRect(canvas, inflated_dirty_rect_),
device_scale_factor) {
saved_canvas_ = canvas;
canvas->save();
CGContextRef cg_context = this->CgContext();
if (cg_context == [[NSGraphicsContext currentContext] graphicsPort]) {
saved_ns_graphics_context_ = 0;
return;
}
saved_ns_graphics_context_ = [[NSGraphicsContext currentContext] retain];
NSGraphicsContext* new_context =
[NSGraphicsContext graphicsContextWithGraphicsPort:cg_context
flipped:YES];
[NSGraphicsContext setCurrentContext:new_context];
did_set_graphics_context_ = true;
}
LocalCurrentGraphicsContext::~LocalCurrentGraphicsContext() {
if (did_set_graphics_context_) {
[NSGraphicsContext setCurrentContext:saved_ns_graphics_context_];
[saved_ns_graphics_context_ release];
}
saved_canvas_->restore();
}
CGContextRef LocalCurrentGraphicsContext::CgContext() {
// This synchronizes the CGContext to reflect the current SkCanvas state.
// The implementation may not return the same CGContext each time.
CGContextRef cg_context = graphics_context_canvas_.CgContext();
return cg_context;
}
}