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Fix image flipping for OpenGL-based screen capturer on Mac.

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I broke captured image flipping when refactoring this code while it was
still in chromium. Previously we had CaptureData that was returned from
capturers with correctly inverted stride, but frames were still stored
with positive stride. CaptureData was removed and so the returned frames
always had positive stride, which is not correct. Now ScreenCapturerMac
uses frames with inverted stride when capturing using OpenGL.

R=wez@chromium.org

Review URL: https://webrtc-codereview.appspot.com/2105004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@4621 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
sergeyu@chromium.org 2013-08-26 21:48:56 +00:00
parent e3de6b1e90
commit 01cb3ad883
1 changed files with 26 additions and 7 deletions
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33
webrtc/modules/desktop_capture/screen_capturer_mac.mm
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@ -219,6 +219,29 @@ class ScreenCapturerMac : public ScreenCapturer {
DISALLOW_COPY_AND_ASSIGN(ScreenCapturerMac);
};
// DesktopFrame wrapper that flips wrapped frame upside down by inverting
// stride.
class InvertedDesktopFrame : public DesktopFrame {
public:
// Takes ownership of |frame|.
InvertedDesktopFrame(DesktopFrame* frame)
: DesktopFrame(
frame->size(), -frame->stride(),
frame->data() - (frame->size().height() - 1) * frame->stride(),
frame->shared_memory()),
original_frame_(frame) {
set_dpi(frame->dpi());
set_capture_time_ms(frame->capture_time_ms());
mutable_updated_region()->Swap(frame->mutable_updated_region());
}
virtual ~InvertedDesktopFrame() {}
private:
scoped_ptr<DesktopFrame> original_frame_;
DISALLOW_COPY_AND_ASSIGN(InvertedDesktopFrame);
};
DesktopFrame* CreateFrame(
const MacDesktopConfiguration& desktop_config) {
@ -364,16 +387,12 @@ void ScreenCapturerMac::Capture(
CgBlitPreLion(*current_frame, region);
}
uint8_t* buffer = current_frame->data();
int stride = current_frame->stride();
if (flip) {
stride = -stride;
buffer += (current_frame->size().height() - 1) * current_frame->stride();
}
DesktopFrame* new_frame = queue_.current_frame()->Share();
*new_frame->mutable_updated_region() = region;
if (flip)
new_frame = new InvertedDesktopFrame(new_frame);
helper_.set_size_most_recent(new_frame->size());
// Signal that we are done capturing data from the display framebuffer,