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/*
* This file is part of diff-pdf.
*
* Copyright (C) 2009 TT-Solutions.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "bmpviewer.h"
#include "gutter.h"
#include <wx/sizer.h>
BEGIN_EVENT_TABLE(BitmapViewer, wxScrolledWindow)
EVT_LEFT_DOWN(BitmapViewer::OnMouseDown)
EVT_LEFT_UP(BitmapViewer::OnMouseUp)
EVT_MOTION(BitmapViewer::OnMouseMove)
EVT_MOUSE_CAPTURE_LOST(BitmapViewer::OnMouseCaptureLost)
EVT_SCROLLWIN(BitmapViewer::OnScrolling)
EVT_SIZE(BitmapViewer::OnSizeChanged)
END_EVENT_TABLE()
BitmapViewer::BitmapViewer(wxWindow *parent)
: wxScrolledWindow(parent,
wxID_ANY,
wxDefaultPosition, wxDefaultSize,
wxFULL_REPAINT_ON_RESIZE)
{
m_gutter = NULL;
m_zoom_factor = 1.0;
SetScrollRate(1, 1);
wxBitmap dummyBitmap(16, 16);
m_content = new wxStaticBitmap(this, wxID_ANY, dummyBitmap);
wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
sizer->Add(m_content, wxSizerFlags(1).Expand());
SetSizer(sizer);
// we need to bind mouse-down event to m_content, as this scrolled window
// will never see mouse events otherwise
m_content->Connect
(
wxEVT_LEFT_DOWN,
wxMouseEventHandler(BitmapViewer::OnMouseDown),
NULL,
this
);
}
void BitmapViewer::SetBestFitZoom()
{
// compute highest scale factor that still doesn't need scrollbars:
float scale_x = float(GetSize().x) / float(m_orig_image.GetWidth());
float scale_y = float(GetSize().y) / float(m_orig_image.GetHeight());
SetZoom(std::min(scale_x, scale_y));
}
void BitmapViewer::UpdateBitmap()
{
int new_w = int(m_orig_image.GetWidth() * m_zoom_factor);
int new_h = int(m_orig_image.GetHeight() * m_zoom_factor);
if ( new_w != m_orig_image.GetWidth() ||
new_h != m_orig_image.GetHeight() )
{
wxImage scaled =
m_orig_image.Scale
(
new_w,
new_h,
// we don't need HQ filtering when upscaling
m_zoom_factor < 1.0
? wxIMAGE_QUALITY_HIGH
: wxIMAGE_QUALITY_NORMAL
);
m_content->SetBitmap(wxBitmap(scaled));
}
else
{
m_content->SetBitmap(wxBitmap(m_orig_image));
}
GetSizer()->FitInside(this);
if ( m_gutter )
m_gutter->UpdateViewPos(this);
}
void BitmapViewer::Set(const wxImage& image)
{
m_orig_image = image;
UpdateBitmap();
}
void BitmapViewer::Set(cairo_surface_t *surface)
{
// Cairo's RGB24 surfaces use 32 bits per pixel, while wxImage uses
// 24 bits per pixel, so we need to convert between the two representations
// manually. Moreover, channels order is different too, RGB vs. BGR.
const int w = cairo_image_surface_get_width(surface);
const int h = cairo_image_surface_get_height(surface);
wxImage img(w, h, false);
unsigned char *p_out = img.GetData();
const unsigned char *p_in = cairo_image_surface_get_data(surface);
const int stride = cairo_image_surface_get_stride(surface);
for ( int y = 0; y < h; y++, p_in += stride )
{
for ( int x = 0; x < w; x++ )
{
*(p_out++) = *(p_in + 4 * x + 2);
*(p_out++) = *(p_in + 4 * x + 1);
*(p_out++) = *(p_in + 4 * x + 0);
}
}
Set(img);
}
void BitmapViewer::AttachGutter(Gutter *g)
{
m_gutter = g;
if ( g )
g->UpdateViewPos(this);
}
void BitmapViewer::OnMouseDown(wxMouseEvent& event)
{
wxPoint view_origin;
GetViewStart(&view_origin.x, &view_origin.y);
const wxPoint pos = event.GetPosition();
m_draggingPage = true;
m_draggingLastMousePos = pos;
CaptureMouse();
}
void BitmapViewer::OnMouseUp(wxMouseEvent&)
{
m_draggingPage = false;
ReleaseMouse();
}
void BitmapViewer::OnMouseMove(wxMouseEvent& event)
{
event.Skip();
if ( !m_draggingPage )
return;
wxPoint view_origin;
GetViewStart(&view_origin.x, &view_origin.y);
const wxPoint pos = event.GetPosition();
wxPoint new_pos = view_origin + (m_draggingLastMousePos - pos);
Scroll(new_pos.x, new_pos.y);
if ( m_gutter )
m_gutter->UpdateViewPos(this);
m_draggingLastMousePos = pos;
}
void BitmapViewer::OnMouseCaptureLost(wxMouseCaptureLostEvent& event)
{
m_draggingPage = false;
event.Skip();
}
void BitmapViewer::OnScrolling(wxScrollWinEvent& event)
{
if ( m_gutter )
m_gutter->UpdateViewPos(this);
event.Skip();
}
void BitmapViewer::OnSizeChanged(wxSizeEvent& event)
{
if ( m_gutter )
m_gutter->UpdateViewPos(this);
event.Skip();
}
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