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diff-pdf.cpp
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diff-pdf.cpp
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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 <stdio.h>
#include <assert.h>
#include <vector>
#include <glib.h>
#include <poppler.h>
#include <cairo/cairo.h>
#include <cairo/cairo-pdf.h>
#include <wx/app.h>
#include <wx/evtloop.h>
#include <wx/cmdline.h>
#include <wx/filename.h>
#include <wx/log.h>
#include <wx/frame.h>
#include <wx/sizer.h>
#include <wx/toolbar.h>
#include <wx/artprov.h>
#include <wx/progdlg.h>
#include <wx/filesys.h>
// ------------------------------------------------------------------------
// PDF rendering functions
// ------------------------------------------------------------------------
bool g_verbose = false;
bool g_skip_identical = false;
bool g_mark_differences = false;
long g_channel_tolerance = 0;
long g_per_page_pixel_tolerance = 0;
bool g_grayscale = false;
// Resolution to use for rasterization, in DPI
#define DEFAULT_RESOLUTION 300
long g_resolution = DEFAULT_RESOLUTION;
inline unsigned char to_grayscale(unsigned char r, unsigned char g, unsigned char b)
{
return (unsigned char)(0.2126 * r + 0.7152 * g + 0.0722 * b);
}
cairo_surface_t *render_page(PopplerPage *page)
{
double w, h;
poppler_page_get_size(page, &w, &h);
const int w_px = int((int)g_resolution * w / 72.0);
const int h_px = int((int)g_resolution * h / 72.0);
cairo_surface_t *surface =
cairo_image_surface_create(CAIRO_FORMAT_RGB24, w_px, h_px);
cairo_t *cr = cairo_create(surface);
// clear the surface to white background:
cairo_save(cr);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_rectangle(cr, 0, 0, w_px, h_px);
cairo_fill(cr);
cairo_restore(cr);
// Scale so that PDF output covers the whole surface. Image surface is
// created with transformation set up so that 1 coordinate unit is 1 pixel;
// Poppler assumes 1 unit = 1 point.
cairo_scale(cr, (int)g_resolution / 72.0, (int)g_resolution / 72.0);
poppler_page_render(page, cr);
cairo_show_page(cr);
cairo_destroy(cr);
return surface;
}
// Creates image of differences between s1 and s2. If the offset is specified,
// then s2 is displaced by it. If thumbnail and thumbnail_width are specified,
// then a thumbnail with highlighted differences is created too.
cairo_surface_t *diff_images(int page, cairo_surface_t *s1, cairo_surface_t *s2,
int offset_x = 0, int offset_y = 0,
wxImage *thumbnail = NULL, int thumbnail_width = -1)
{
assert( s1 || s2 );
long pixel_diff_count = 0;
wxRect r1, r2;
if ( s1 )
{
r1 = wxRect(0, 0,
cairo_image_surface_get_width(s1),
cairo_image_surface_get_height(s1));
}
if ( s2 )
{
r2 = wxRect(offset_x, offset_y,
cairo_image_surface_get_width(s2),
cairo_image_surface_get_height(s2));
}
// compute union rectangle starting at [0,0] position
wxRect rdiff(r1);
rdiff.Union(r2);
r1.Offset(-rdiff.x, -rdiff.y);
r2.Offset(-rdiff.x, -rdiff.y);
rdiff.Offset(-rdiff.x, -rdiff.y);
bool changes = false;
cairo_surface_t *diff =
cairo_image_surface_create(CAIRO_FORMAT_RGB24, rdiff.width, rdiff.height);
float thumbnail_scale;
int thumbnail_height;
if ( thumbnail )
{
thumbnail_scale = float(thumbnail_width) / float(rdiff.width);
thumbnail_height = int(rdiff.height * thumbnail_scale);
thumbnail->Create(thumbnail_width, thumbnail_height);
// initalize the thumbnail with a white rectangle:
thumbnail->SetRGB(wxRect(), 255, 255, 255);
}
// clear the surface to white background if the merged images don't fully
// overlap:
if ( r1 != r2 )
{
changes = true;
cairo_t *cr = cairo_create(diff);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_rectangle(cr, 0, 0, rdiff.width, rdiff.height);
cairo_fill(cr);
cairo_destroy(cr);
}
const int stride1 = s1 ? cairo_image_surface_get_stride(s1) : 0;
const int stride2 = s2 ? cairo_image_surface_get_stride(s2) : 0;
const int stridediff = cairo_image_surface_get_stride(diff);
const unsigned char *data1 = s1 ? cairo_image_surface_get_data(s1) : NULL;
const unsigned char *data2 = s2 ? cairo_image_surface_get_data(s2) : NULL;
unsigned char *datadiff = cairo_image_surface_get_data(diff);
// we visualize the differences by taking one channel from s1
// and the other two channels from s2:
// first, copy s1 over:
if ( s1 )
{
unsigned char *out = datadiff + r1.y * stridediff + r1.x * 4;
for ( int y = 0;
y < r1.height;
y++, data1 += stride1, out += stridediff )
{
memcpy(out, data1, r1.width * 4);
}
}
// then, copy B channel from s2 over it; also compare the two versions
// to see if there are any differences:
if ( s2 )
{
unsigned char *out = datadiff + r2.y * stridediff + r2.x * 4;
for ( int y = 0;
y < r2.height;
y++, data2 += stride2, out += stridediff )
{
bool linediff = false;
for ( int x = 0; x < r2.width * 4; x += 4 )
{
unsigned char cr1 = *(out + x + 0);
unsigned char cg1 = *(out + x + 1);
unsigned char cb1 = *(out + x + 2);
unsigned char cr2 = *(data2 + x + 0);
unsigned char cg2 = *(data2 + x + 1);
unsigned char cb2 = *(data2 + x + 2);
if ( cr1 > (cr2+g_channel_tolerance) || cr1 < (cr2-g_channel_tolerance)
|| cg1 > (cg2+g_channel_tolerance) || cg1 < (cg2-g_channel_tolerance)
|| cb1 > (cb2+g_channel_tolerance) || cb1 < (cb2-g_channel_tolerance)
)
{
pixel_diff_count++;
changes = true;
linediff = true;
if ( thumbnail )
{
// calculate the coordinates in the thumbnail
int tx = int((r2.x + x/4.0) * thumbnail_scale);
int ty = int((r2.y + y) * thumbnail_scale);
// Limit the coordinates to the thumbnail size (may be
// off slightly due to rounding errors).
// See https://github.com/vslavik/diff-pdf/pull/58
tx = std::min(tx, thumbnail_width - 1);
ty = std::min(ty, thumbnail_height - 1);
// mark changes with red
thumbnail->SetRGB(tx, ty, 255, 0, 0);
}
}
if (g_grayscale)
{
// convert both images to grayscale, use blue for s1, red for s2
unsigned char gray1 = to_grayscale(cr1, cg1, cb1);
unsigned char gray2 = to_grayscale(cr2, cg2, cb2);
*(out + x + 0) = gray2;
*(out + x + 1) = (gray1 + gray2) / 2;
*(out + x + 2) = gray1;
}
else
{
// change the B channel to be from s2; RG will be s1
*(out + x + 2) = cb2;
}
}
if (g_mark_differences && linediff)
{
for (int x = 0; x < (10 < r2.width ? 10 : r2.width) * 4; x+=4)
{
*(out + x + 0) = 0;
*(out + x + 1) = 0;
*(out + x + 2) = 255;
}
}
}
}
// add background image of the page to the thumbnails
if ( thumbnail )
{
// copy the 'diff' surface into wxImage:
wxImage bg(rdiff.width, rdiff.height);
unsigned char *in = datadiff;
unsigned char *out = bg.GetData();
for ( int y = 0; y < rdiff.height; y++, in += stridediff )
{
for ( int x = 0; x < rdiff.width * 4; x += 4 )
{
// cairo_surface_t uses BGR order, wxImage has RGB
*(out++) = *(in + x + 2);
*(out++) = *(in + x + 1);
*(out++) = *(in + x + 0);
}
}
// scale it to thumbnail size:
bg.Rescale(thumbnail_width, thumbnail_height, wxIMAGE_QUALITY_HIGH);
// and merge with the diff markers in *thumbnail, making it much
// lighter in the process:
in = bg.GetData();
out = thumbnail->GetData();
for ( int i = thumbnail_width * thumbnail_height; i > 0; i-- )
{
if ( out[1] == 0 ) // G=0 ==> not white
{
// marked with red color, as place with differences -- don't
// paint background image here, make the red as visible as
// possible
out += 3;
in += 3;
}
else
{
// merge in lighter background image
*(out++) = 128 + *(in++) / 2;
*(out++) = 128 + *(in++) / 2;
*(out++) = 128 + *(in++) / 2;
}
}
// If there were no changes, indicate it by using green
// (170,230,130) color for the thumbnail in gutter control:
if ( !changes )
{
out = thumbnail->GetData();
for ( int i = thumbnail_width * thumbnail_height;
i > 0;
i--, out += 3 )
{
out[0] = 170/2 + out[0] / 2;
out[1] = 230/2 + out[1] / 2;
out[2] = 130/2 + out[2] / 2;
}
}
}
if ( g_verbose )
printf("page %d has %ld pixels that differ\n", page, pixel_diff_count);
// If we specified a tolerance, then return if we have exceeded that for this page
if ( g_per_page_pixel_tolerance == 0 ? changes : pixel_diff_count > g_per_page_pixel_tolerance)
{
return diff;
}
else
{
cairo_surface_destroy(diff);
return NULL;
}
}
// Compares given two pages. If cr_out is not NULL, then the diff image (either
// differences or unmodified page, if there are no diffs) is drawn to it.
// If thumbnail and thumbnail_width are specified, then a thumbnail with
// highlighted differences is created too.
bool page_compare(int page, cairo_t *cr_out,
PopplerPage *page1, PopplerPage *page2,
wxImage *thumbnail = NULL, int thumbnail_width = -1)
{
cairo_surface_t *img1 = page1 ? render_page(page1) : NULL;
cairo_surface_t *img2 = page2 ? render_page(page2) : NULL;
cairo_surface_t *diff = diff_images(page, img1, img2, 0, 0,
thumbnail, thumbnail_width);
const bool has_diff = (diff != NULL);
if ( cr_out )
{
if ( diff )
{
// render the difference as high-resolution bitmap
cairo_save(cr_out);
cairo_scale(cr_out, 72.0 / g_resolution, 72.0 / g_resolution);
cairo_set_source_surface(cr_out, diff ? diff : img1, 0, 0);
cairo_paint(cr_out);
cairo_restore(cr_out);
}
else
{
// save space (as well as improve rendering quality) in diff pdf
// by writing unchanged pages in their original form rather than
// a rasterized one
if (!g_skip_identical)
poppler_page_render(page1, cr_out);
}
if (diff || !g_skip_identical)
cairo_show_page(cr_out);
}
if ( diff )
cairo_surface_destroy(diff);
if ( img1 )
cairo_surface_destroy(img1);
if ( img2 )
cairo_surface_destroy(img2);
return !has_diff;
}
// Compares two documents, writing diff PDF into file named 'pdf_output' if
// not NULL. if 'differences' is not NULL, puts a map of which pages differ
// into it. If 'progress' is provided, it is updated to reflect comparison's
// progress. If 'gutter' is set, then all the pages are added to it, with
// their respective thumbnails (the gutter must be empty beforehand).
bool doc_compare(PopplerDocument *doc1, PopplerDocument *doc2,
const char *pdf_output,
std::vector<bool> *differences,
wxProgressDialog *progress = NULL,
Gutter *gutter = NULL)
{
int pages_differ = 0;
cairo_surface_t *surface_out = NULL;
cairo_t *cr_out = NULL;
if ( pdf_output )
{
double w, h;
poppler_page_get_size(poppler_document_get_page(doc1, 0), &w, &h);
surface_out = cairo_pdf_surface_create(pdf_output, w, h);
cr_out = cairo_create(surface_out);
}
int pages1 = poppler_document_get_n_pages(doc1);
int pages2 = poppler_document_get_n_pages(doc2);
int pages_total = pages1 > pages2 ? pages1 : pages2;
if ( pages1 != pages2 )
{
if ( g_verbose )
printf("pages count differs: %d vs %d\n", pages1, pages2);
}
for ( int page = 0; page < pages_total; page++ )
{
if ( progress )
{
progress->Update
(
page,
wxString::Format
(
"Comparing page %d of %d...",
page+1,
pages_total
)
);
}
if ( pdf_output && page != 0 )
{
double w, h;
poppler_page_get_size(poppler_document_get_page(doc1, page), &w, &h);
cairo_pdf_surface_set_size(surface_out, w, h);
}
PopplerPage *page1 = page < pages1
? poppler_document_get_page(doc1, page)
: NULL;
PopplerPage *page2 = page < pages2
? poppler_document_get_page(doc2, page)
: NULL;
bool page_same;
if ( gutter )
{
wxImage thumbnail;
page_same = page_compare(page, cr_out, page1, page2,
&thumbnail, Gutter::WIDTH);
wxString label1("(null)");
wxString label2("(null)");
if ( page1 )
{
gchar *label;
g_object_get(page1, "label", &label, NULL);
label1 = wxString::FromUTF8(label);
g_free(label);
}
if ( page2 )
{
gchar *label;
g_object_get(page2, "label", &label, NULL);
label2 = wxString::FromUTF8(label);
g_free(label);
}
wxString label;
if ( label1 == label2 )
label = label1;
else
label = label1 + " / " + label2;
gutter->AddPage(label, thumbnail);
}
else
{
page_same = page_compare(page, cr_out, page1, page2);
}
if ( differences )
differences->push_back(!page_same);
if ( !page_same )
{
pages_differ ++;
if ( g_verbose )
printf("page %d differs\n", page);
// If we don't need to output all different pages in any
// form (including verbose report of differing pages!), then
// we can stop comparing the PDFs as soon as we find the first
// difference.
if ( !g_verbose && !pdf_output && !differences && !gutter )
break;
}
}
if ( pdf_output )
{
cairo_destroy(cr_out);
cairo_surface_destroy(surface_out);
}
if (g_verbose)
printf("%d of %d pages differ.\n", pages_differ, pages_total);
// are doc1 and doc1 the same?
return (pages_differ == 0) && (pages1 == pages2);
}
// ------------------------------------------------------------------------
// wxWidgets GUI
// ------------------------------------------------------------------------
const int ID_PREV_PAGE = wxNewId();
const int ID_NEXT_PAGE = wxNewId();
const int ID_ZOOM_IN = wxNewId();
const int ID_ZOOM_OUT = wxNewId();
const int ID_OFFSET_LEFT = wxNewId();
const int ID_OFFSET_RIGHT = wxNewId();
const int ID_OFFSET_UP = wxNewId();
const int ID_OFFSET_DOWN = wxNewId();
const int ID_GUTTER = wxNewId();
#define BMP_ARTPROV(id) wxArtProvider::GetBitmap(id, wxART_TOOLBAR)
#define BMP_PREV_PAGE BMP_ARTPROV(wxART_GO_BACK)
#define BMP_NEXT_PAGE BMP_ARTPROV(wxART_GO_FORWARD)
#define BMP_OFFSET_LEFT BMP_ARTPROV(wxART_GO_BACK)
#define BMP_OFFSET_RIGHT BMP_ARTPROV(wxART_GO_FORWARD)
#define BMP_OFFSET_UP BMP_ARTPROV(wxART_GO_UP)
#define BMP_OFFSET_DOWN BMP_ARTPROV(wxART_GO_DOWN)
#ifdef __WXGTK__
#define BMP_ZOOM_IN BMP_ARTPROV("gtk-zoom-in")
#define BMP_ZOOM_OUT BMP_ARTPROV("gtk-zoom-out")
#else
#include "gtk-zoom-in.xpm"
#include "gtk-zoom-out.xpm"
#define BMP_ZOOM_IN wxBitmap(gtk_zoom_in_xpm)
#define BMP_ZOOM_OUT wxBitmap(gtk_zoom_out_xpm)
#endif
static const float ZOOM_FACTOR_STEP = 1.2f;
class DiffFrame : public wxFrame
{
public:
DiffFrame(const wxString& title)
: wxFrame(NULL, wxID_ANY, title)
{
m_cur_page = -1;
CreateStatusBar(2);
SetStatusBarPane(0);
const int stat_widths[] = { -1, 150 };
SetStatusWidths(2, stat_widths);
wxToolBar *toolbar =
new wxToolBar
(
this, wxID_ANY,
wxDefaultPosition, wxDefaultSize,
wxTB_HORIZONTAL | wxTB_FLAT | wxTB_HORZ_TEXT
);
toolbar->AddTool(ID_PREV_PAGE, "Previous", BMP_PREV_PAGE,
"Go to previous page (PgUp)");
toolbar->AddTool(ID_NEXT_PAGE, "Next", BMP_NEXT_PAGE,
"Go to next page (PgDown)");
toolbar->AddTool(ID_ZOOM_IN, "Zoom in", BMP_ZOOM_IN,
"Make the page larger (Ctrl +)");
toolbar->AddTool(ID_ZOOM_OUT, "Zoom out", BMP_ZOOM_OUT,
"Make the page smaller (Ctrl -)");
toolbar->AddTool(ID_OFFSET_LEFT, "", BMP_OFFSET_LEFT,
"Offset one of the pages to the left (Ctrl left)");
toolbar->AddTool(ID_OFFSET_RIGHT, "", BMP_OFFSET_RIGHT,
"Offset one of the pages to the right (Ctrl right)");
toolbar->AddTool(ID_OFFSET_UP, "", BMP_OFFSET_UP,
"Offset one of the pages up (Ctrl up)");
toolbar->AddTool(ID_OFFSET_DOWN, "", BMP_OFFSET_DOWN,
"Offset one of the pages down (Ctrl down)");
toolbar->Realize();
SetToolBar(toolbar);
wxAcceleratorEntry accels[8];
accels[0].Set(wxACCEL_NORMAL, WXK_PAGEUP, ID_PREV_PAGE);
accels[1].Set(wxACCEL_NORMAL, WXK_PAGEDOWN, ID_NEXT_PAGE);
accels[2].Set(wxACCEL_CTRL, (int)'=', ID_ZOOM_IN);
accels[3].Set(wxACCEL_CTRL, (int)'-', ID_ZOOM_OUT);
accels[4].Set(wxACCEL_CTRL, WXK_LEFT, ID_OFFSET_LEFT);
accels[5].Set(wxACCEL_CTRL, WXK_RIGHT, ID_OFFSET_RIGHT);
accels[6].Set(wxACCEL_CTRL, WXK_UP, ID_OFFSET_UP);
accels[7].Set(wxACCEL_CTRL, WXK_DOWN, ID_OFFSET_DOWN);
wxAcceleratorTable accel_table(8, accels);
SetAcceleratorTable(accel_table);
m_gutter = new Gutter(this, ID_GUTTER);
m_viewer = new BitmapViewer(this);
m_viewer->AttachGutter(m_gutter);
m_viewer->SetFocus();
wxBoxSizer *sizer = new wxBoxSizer(wxHORIZONTAL);
sizer->Add(m_gutter, wxSizerFlags(0).Expand().Border(wxALL, 2));
sizer->Add(m_viewer, wxSizerFlags(1).Expand());
SetSizer(sizer);
}
void SetDocs(PopplerDocument *doc1, PopplerDocument *doc2)
{
m_doc1 = doc1;
m_doc2 = doc2;
wxProgressDialog progress("Comparing documents",
"Comparing documents...",
wxMax(poppler_document_get_n_pages(m_doc1),
poppler_document_get_n_pages(m_doc2)),
this,
wxPD_SMOOTH | wxPD_REMAINING_TIME);
doc_compare(m_doc1, m_doc2, NULL, &m_pages, &progress, m_gutter);
progress.Pulse();
m_diff_count = 0;
for ( std::vector<bool>::const_iterator i = m_pages.begin();
i != m_pages.end();
++i )
{
if ( *i )
m_diff_count++;
}
GoToPage(0);
progress.Pulse();
m_viewer->SetBestFitZoom();
UpdateStatus();
progress.Hide();
}
void GoToPage(int n)
{
m_cur_page = n;
m_gutter->SetSelection(n);
DoUpdatePage();
}
private:
void DoUpdatePage()
{
wxBusyCursor wait;
const int pages1 = poppler_document_get_n_pages(m_doc1);
const int pages2 = poppler_document_get_n_pages(m_doc2);
PopplerPage *page1 = m_cur_page < pages1
? poppler_document_get_page(m_doc1, m_cur_page)
: NULL;
PopplerPage *page2 = m_cur_page < pages2
? poppler_document_get_page(m_doc2, m_cur_page)
: NULL;
cairo_surface_t *img1 = page1 ? render_page(page1) : NULL;
cairo_surface_t *img2 = page2 ? render_page(page2) : NULL;
wxImage thumbnail;
cairo_surface_t *diff = diff_images
(
m_cur_page,
img1, img2,
m_offset.x, m_offset.y,
&thumbnail, Gutter::WIDTH
);
m_viewer->Set(diff ? diff : img1);
// Always update the diff map. It will be all-white if there were
// no differences.
m_gutter->SetThumbnail(m_cur_page, thumbnail);
if ( img1 )
cairo_surface_destroy(img1);
if ( img2 )
cairo_surface_destroy(img2);
if ( diff )
cairo_surface_destroy(diff);
UpdateStatus();
}
void UpdateStatus()
{
SetStatusText
(
wxString::Format
(
"Page %d of %d; %d of them %s different, this page %s",
m_cur_page + 1 /* humans prefer 1-based counting*/,
(int)m_pages.size(),
m_diff_count,
m_diff_count == 1 ? "is" : "are",
m_pages[m_cur_page] ? "differs" : "is unchanged"
),
0
);
SetStatusText
(
wxString::Format
(
"%.1f%% [offset %d,%d]",
m_viewer->GetZoom() * 100.0,
m_offset.x, m_offset.y
),
1
);
}
void OnSetPage(wxCommandEvent& event)
{
GoToPage(event.GetSelection());
}
void OnPrevPage(wxCommandEvent&)
{
if ( m_cur_page > 0 )
GoToPage(m_cur_page - 1);
}
void OnNextPage(wxCommandEvent&)
{
if ( m_cur_page < m_pages.size() - 1 )
GoToPage(m_cur_page + 1);
}
void OnUpdatePrevPage(wxUpdateUIEvent& event)
{
event.Enable(m_cur_page > 0);
}
void OnUpdateNextPage(wxUpdateUIEvent& event)
{
event.Enable(m_cur_page < m_pages.size() - 1);
}
void OnZoomIn(wxCommandEvent&)
{
wxBusyCursor wait;
m_viewer->SetZoom(m_viewer->GetZoom() * ZOOM_FACTOR_STEP);
UpdateStatus();
}
void OnZoomOut(wxCommandEvent&)
{
wxBusyCursor wait;
m_viewer->SetZoom(m_viewer->GetZoom() / ZOOM_FACTOR_STEP);
UpdateStatus();
}
void DoOffset(int x, int y)
{
m_offset.x += x;
m_offset.y += y;
DoUpdatePage();
}
void OnOffsetLeft(wxCommandEvent&) { DoOffset(-1, 0); }
void OnOffsetRight(wxCommandEvent&) { DoOffset(1, 0); }
void OnOffsetUp(wxCommandEvent&) { DoOffset(0, -1); }
void OnOffsetDown(wxCommandEvent&) { DoOffset(0, 1); }
DECLARE_EVENT_TABLE()
private:
BitmapViewer *m_viewer;
Gutter *m_gutter;
PopplerDocument *m_doc1, *m_doc2;
std::vector<bool> m_pages;
int m_diff_count;
int m_cur_page;
wxPoint m_offset;
};
BEGIN_EVENT_TABLE(DiffFrame, wxFrame)
EVT_LISTBOX (ID_GUTTER, DiffFrame::OnSetPage)
EVT_TOOL (ID_PREV_PAGE, DiffFrame::OnPrevPage)
EVT_TOOL (ID_NEXT_PAGE, DiffFrame::OnNextPage)
EVT_UPDATE_UI(ID_PREV_PAGE, DiffFrame::OnUpdatePrevPage)
EVT_UPDATE_UI(ID_NEXT_PAGE, DiffFrame::OnUpdateNextPage)
EVT_TOOL (ID_ZOOM_IN, DiffFrame::OnZoomIn)
EVT_TOOL (ID_ZOOM_OUT, DiffFrame::OnZoomOut)
EVT_TOOL (ID_OFFSET_LEFT, DiffFrame::OnOffsetLeft)
EVT_TOOL (ID_OFFSET_RIGHT, DiffFrame::OnOffsetRight)
EVT_TOOL (ID_OFFSET_UP, DiffFrame::OnOffsetUp)
EVT_TOOL (ID_OFFSET_DOWN, DiffFrame::OnOffsetDown)
END_EVENT_TABLE()
class DiffPdfApp : public wxApp
{
public:
DiffPdfApp() : m_tlw(NULL) {}
virtual bool OnInit()
{
m_tlw = new DiffFrame(m_title);
// like in LMI, maximize the window
m_tlw->Maximize();
m_tlw->Show();
// yield so that size changes above take effect immediately (and so we
// can query the window for its size)
Yield();
return true;
}
void SetData(const wxString& file1, PopplerDocument *doc1,
const wxString& file2, PopplerDocument *doc2)
{
m_title = wxString::Format("Differences between %s and %s", file1.c_str(), file2.c_str());
m_doc1 = doc1;
m_doc2 = doc2;
}
protected:
virtual void OnEventLoopEnter(wxEventLoopBase *loop)
{
wxApp::OnEventLoopEnter(loop);
if ( loop->IsMain() )
SetFrameDocs();
}
void SetFrameDocs()
{
wxASSERT( m_tlw );
wxASSERT( m_doc1 );
wxASSERT( m_doc2 );
m_tlw->SetDocs(m_doc1, m_doc2);
}
private:
DiffFrame *m_tlw;
wxString m_title;
PopplerDocument *m_doc1, *m_doc2;
};
IMPLEMENT_APP_NO_MAIN(DiffPdfApp);
// ------------------------------------------------------------------------
// main()
// ------------------------------------------------------------------------
int main(int argc, char *argv[])
{
wxAppConsole::CheckBuildOptions(WX_BUILD_OPTIONS_SIGNATURE, "diff-pdf");
wxInitializer wxinitializer(argc, argv);
static const wxCmdLineEntryDesc cmd_line_desc[] =
{
{ wxCMD_LINE_SWITCH,
"h", "help", "show this help message",
wxCMD_LINE_VAL_NONE, wxCMD_LINE_OPTION_HELP },
{ wxCMD_LINE_SWITCH,
"v", "verbose", "be verbose" },
{ wxCMD_LINE_SWITCH,
"s", "skip-identical", "only output pages with differences" },
{ wxCMD_LINE_SWITCH,
"m", "mark-differences", "additionally mark differences on left side" },
{ wxCMD_LINE_SWITCH,
"g", "grayscale", "only differences will be in color, unchanged parts will show as gray" },
{ wxCMD_LINE_OPTION,
NULL, "output-diff", "output differences to given PDF file",
wxCMD_LINE_VAL_STRING },
{ wxCMD_LINE_OPTION,
NULL, "channel-tolerance", "consider channel values to be equal if within specified tolerance",
wxCMD_LINE_VAL_NUMBER },
{ wxCMD_LINE_OPTION,
NULL, "per-page-pixel-tolerance", "total number of pixels allowed to be different per page before specifying the page is different",
wxCMD_LINE_VAL_NUMBER },
{ wxCMD_LINE_OPTION,
NULL, "dpi", "rasterization resolution (default: " wxSTRINGIZE(DEFAULT_RESOLUTION) " dpi)",
wxCMD_LINE_VAL_NUMBER },
{ wxCMD_LINE_SWITCH,
NULL, "view", "view the differences in a window" },
{ wxCMD_LINE_PARAM,
NULL, NULL, "file1.pdf", wxCMD_LINE_VAL_STRING },
{ wxCMD_LINE_PARAM,
NULL, NULL, "file2.pdf", wxCMD_LINE_VAL_STRING },
{ wxCMD_LINE_NONE }
};
wxCmdLineParser parser(cmd_line_desc, argc, argv);
// Set default output to stderr
wxMessageOutput::Set(new wxMessageOutputStderr);
switch ( parser.Parse() )
{
case -1: // --help
return 0;
case 0: // everything is ok; proceed
break;
default: // syntax error
return 2;
}
if ( parser.Found("verbose") )
g_verbose = true;
if ( parser.Found("skip-identical") )
g_skip_identical = true;
if ( parser.Found("mark-differences") )
g_mark_differences = true;
if ( parser.Found("grayscale") )
g_grayscale = true;
wxFileName file1(parser.GetParam(0));
wxFileName file2(parser.GetParam(1));
file1.MakeAbsolute();
file2.MakeAbsolute();
const wxString url1 = wxFileSystem::FileNameToURL(file1);
const wxString url2 = wxFileSystem::FileNameToURL(file2);
GError *err = NULL;
PopplerDocument *doc1 = poppler_document_new_from_file(url1.utf8_str(), NULL, &err);
if ( !doc1 )
{
fprintf(stderr, "Error opening %s: %s\n", (const char*) parser.GetParam(0).c_str(), err->message);
g_error_free(err);
return 3;
}
PopplerDocument *doc2 = poppler_document_new_from_file(url2.utf8_str(), NULL, &err);
if ( !doc2 )
{
fprintf(stderr, "Error opening %s: %s\n", (const char*) parser.GetParam(1).c_str(), err->message);
g_error_free(err);
return 3;
}
if ( parser.Found("per-page-pixel-tolerance", &g_per_page_pixel_tolerance) )
{
if (g_per_page_pixel_tolerance < 0) {
fprintf(stderr, "Invalid per-page-pixel-tolerance: %ld. Must be 0 or more\n", g_per_page_pixel_tolerance);
return 2;
}
}
if ( parser.Found("channel-tolerance", &g_channel_tolerance) )
{
if (g_channel_tolerance < 0 || g_channel_tolerance > 255) {
fprintf(stderr, "Invalid channel-tolerance: %ld. Valid range is 0(default, exact matching)-255\n", g_channel_tolerance);
return 2;
}
}