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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/blit.h"
#if defined(OS_POSIX) && !defined(OS_MACOSX)
#include <cairo/cairo.h>
#endif
#if defined(OS_MACOSX)
#include "base/scoped_cftyperef.h"
#endif
#include "gfx/point.h"
#include "gfx/rect.h"
#include "skia/ext/platform_canvas.h"
#include "skia/ext/platform_device.h"
namespace gfx {
void BlitContextToContext(NativeDrawingContext dst_context,
const Rect& dst_rect,
NativeDrawingContext src_context,
const Point& src_origin) {
#if defined(OS_WIN)
BitBlt(dst_context, dst_rect.x(), dst_rect.y(),
dst_rect.width(), dst_rect.height(),
src_context, src_origin.x(), src_origin.y(), SRCCOPY);
#elif defined(OS_MACOSX)
// Only translations and/or vertical flips in the source context are
// supported; more complex source context transforms will be ignored.
// If there is a translation on the source context, we need to account for
// it ourselves since CGBitmapContextCreateImage will bypass it.
Rect src_rect(src_origin, dst_rect.size());
CGAffineTransform transform = CGContextGetCTM(src_context);
bool flipped = fabs(transform.d + 1) < 0.0001;
CGFloat delta_y = flipped ? CGBitmapContextGetHeight(src_context) -
transform.ty
: transform.ty;
src_rect.Offset(transform.tx, delta_y);
scoped_cftyperef<CGImageRef>
src_image(CGBitmapContextCreateImage(src_context));
scoped_cftyperef<CGImageRef> src_sub_image(
CGImageCreateWithImageInRect(src_image, src_rect.ToCGRect()));
CGContextDrawImage(dst_context, dst_rect.ToCGRect(), src_sub_image);
#else // Linux, BSD, others
// Only translations in the source context are supported; more complex
// source context transforms will be ignored.
cairo_save(dst_context);
double surface_x = src_origin.x();
double surface_y = src_origin.y();
cairo_user_to_device(src_context, &surface_x, &surface_y);
cairo_set_source_surface(dst_context, cairo_get_target(src_context),
dst_rect.x()-surface_x, dst_rect.y()-surface_y);
cairo_rectangle(dst_context, dst_rect.x(), dst_rect.y(),
dst_rect.width(), dst_rect.height());
cairo_clip(dst_context);
cairo_paint(dst_context);
cairo_restore(dst_context);
#endif
}
static NativeDrawingContext GetContextFromCanvas(
skia::PlatformCanvas *canvas) {
skia::PlatformDevice& device = canvas->getTopPlatformDevice();
#if defined(OS_WIN)
return device.getBitmapDC();
#elif defined(OS_MACOSX)
return device.GetBitmapContext();
#else // Linux, BSD, others
return device.beginPlatformPaint();
#endif
}
void BlitContextToCanvas(skia::PlatformCanvas *dst_canvas,
const Rect& dst_rect,
NativeDrawingContext src_context,
const Point& src_origin) {
BlitContextToContext(GetContextFromCanvas(dst_canvas), dst_rect,
src_context, src_origin);
}
void BlitCanvasToContext(NativeDrawingContext dst_context,
const Rect& dst_rect,
skia::PlatformCanvas *src_canvas,
const Point& src_origin) {
BlitContextToContext(dst_context, dst_rect,
GetContextFromCanvas(src_canvas), src_origin);
}
void BlitCanvasToCanvas(skia::PlatformCanvas *dst_canvas,
const Rect& dst_rect,
skia::PlatformCanvas *src_canvas,
const Point& src_origin) {
BlitContextToContext(GetContextFromCanvas(dst_canvas), dst_rect,
GetContextFromCanvas(src_canvas), src_origin);
}
} // namespace gfx
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