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kicad/common/gal/cairo/cairo_gal.cpp

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/*
* This program source code file is part of KICAD, a free EDA CAD application.
*
* Copyright (C) 2012 Torsten Hueter, torstenhtr <at> gmx.de
* Copyright (C) 2012 Kicad Developers, see change_log.txt for contributors.
* Copyright (C) 2017-2018 CERN
* @author Maciej Suminski <maciej.suminski@cern.ch>
*
* CairoGal - Graphics Abstraction Layer for Cairo
*
* 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, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <wx/image.h>
#include <wx/log.h>
#include <gal/cairo/cairo_gal.h>
#include <gal/cairo/cairo_compositor.h>
#include <gal/definitions.h>
#include <geometry/shape_poly_set.h>
#include <bitmap_base.h>
#include <limits>
#include <pixman.h>
using namespace KIGFX;
CAIRO_GAL_BASE::CAIRO_GAL_BASE( GAL_DISPLAY_OPTIONS& aDisplayOptions ) :
GAL( aDisplayOptions )
{
// Initialise grouping
isGrouping = false;
isElementAdded = false;
groupCounter = 0;
currentGroup = nullptr;
// Initialise Cairo state
cairo_matrix_init_identity( &cairoWorldScreenMatrix );
currentContext = nullptr;
context = nullptr;
surface = nullptr;
// Grid color settings are different in Cairo and OpenGL
SetGridColor( COLOR4D( 0.1, 0.1, 0.1, 0.8 ) );
SetAxesColor( COLOR4D( BLUE ) );
}
CAIRO_GAL_BASE::~CAIRO_GAL_BASE()
{
ClearCache();
if( surface )
cairo_surface_destroy( surface );
if( context )
cairo_destroy( context );
}
void CAIRO_GAL_BASE::beginDrawing()
{
resetContext();
}
void CAIRO_GAL_BASE::endDrawing()
{
// Force remaining objects to be drawn
Flush();
}
void CAIRO_GAL_BASE::updateWorldScreenMatrix()
{
cairo_matrix_multiply( &currentWorld2Screen, &currentXform, &cairoWorldScreenMatrix );
}
const VECTOR2D CAIRO_GAL_BASE::xform( double x, double y )
{
VECTOR2D rv;
rv.x = currentWorld2Screen.xx * x + currentWorld2Screen.xy * y + currentWorld2Screen.x0;
rv.y = currentWorld2Screen.yx * x + currentWorld2Screen.yy * y + currentWorld2Screen.y0;
return rv;
}
const VECTOR2D CAIRO_GAL_BASE::xform( const VECTOR2D& aP )
{
return xform(aP.x, aP.y);
}
const double CAIRO_GAL_BASE::xform( double x )
{
double dx = currentWorld2Screen.xx * x;
double dy = currentWorld2Screen.yx * x;
return sqrt( dx * dx + dy * dy );
}
static double roundp( double x )
{
return floor( x + 0.5 ) + 0.5;
}
const VECTOR2D CAIRO_GAL_BASE::roundp( const VECTOR2D& v )
{
if ( lineWidthIsOdd )
return VECTOR2D( ::roundp( v.x ), ::roundp( v.y ) );
else
return VECTOR2D( floor( v.x + 0.5 ), floor( v.y + 0.5 ) );
}
void CAIRO_GAL_BASE::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
syncLineWidth();
auto p0 = roundp( xform( aStartPoint ) );
auto p1 = roundp( xform( aEndPoint ) );
cairo_move_to( currentContext, p0.x, p0.y );
cairo_line_to( currentContext, p1.x, p1.y );
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::syncLineWidth( bool aForceWidth, double aWidth )
{
auto w = floor( xform( aForceWidth ? aWidth : lineWidth ) + 0.5 );
if (w <= 1.0)
{
w = 1.0;
cairo_set_line_join( currentContext, CAIRO_LINE_JOIN_MITER );
cairo_set_line_cap( currentContext, CAIRO_LINE_CAP_BUTT );
cairo_set_line_width( currentContext, 1.0 );
lineWidthIsOdd = true;
}
else
{
cairo_set_line_join( currentContext, CAIRO_LINE_JOIN_ROUND );
cairo_set_line_cap( currentContext, CAIRO_LINE_CAP_ROUND );
cairo_set_line_width( currentContext, w );
lineWidthIsOdd = ((int)w % 2) == 1;
}
lineWidthInPixels = w;
}
void CAIRO_GAL_BASE::DrawSegment( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint,
double aWidth )
{
if( isFillEnabled )
{
syncLineWidth( true, aWidth );
auto p0 = roundp( xform( aStartPoint ) );
auto p1 = roundp( xform( aEndPoint ) );
cairo_move_to( currentContext, p0.x, p0.y );
cairo_line_to( currentContext, p1.x, p1.y );
cairo_set_source_rgba( currentContext, fillColor.r, fillColor.g, fillColor.b, fillColor.a );
cairo_stroke( currentContext );
}
else
{
// Outline mode for tracks
VECTOR2D startEndVector = aEndPoint - aStartPoint;
double lineAngle = atan2( startEndVector.y, startEndVector.x );
double sa = sin( lineAngle + M_PI / 2.0 );
double ca = cos( lineAngle + M_PI / 2.0 );
auto pa0 = roundp( xform ( aStartPoint + VECTOR2D(aWidth * ca, aWidth * sa ) ) );
auto pa1 = roundp( xform ( aStartPoint - VECTOR2D(aWidth * ca, aWidth * sa ) ) );
auto pb0 = roundp( xform ( aEndPoint + VECTOR2D(aWidth * ca, aWidth * sa ) ) );
auto pb1 = roundp( xform ( aEndPoint - VECTOR2D(aWidth * ca, aWidth * sa ) ) );
auto pa = roundp( xform( aStartPoint ) );
auto pb = roundp( xform( aEndPoint ) );
auto rb = ::roundp( (pa0 - pa).EuclideanNorm() );
cairo_set_source_rgba( currentContext, strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
cairo_move_to( currentContext, pa0.x, pa0.y );
cairo_line_to( currentContext, pb0.x, pb0.y );
cairo_move_to( currentContext, pa1.x, pa1.y );
cairo_line_to( currentContext, pb1.x, pb1.y );
cairo_arc( currentContext, pb.x, pb.y, rb, lineAngle - M_PI / 2.0, lineAngle + M_PI / 2.0 );
cairo_arc( currentContext, pa.x, pa.y, rb, lineAngle + M_PI / 2.0, lineAngle + 3.0 * M_PI / 2.0 );
flushPath();
}
isElementAdded = true;
}
void CAIRO_GAL_BASE::DrawCircle( const VECTOR2D& aCenterPoint, double aRadius )
{
syncLineWidth();
auto c = roundp( xform( aCenterPoint ) );
auto r = ::roundp( xform( aRadius ) );
cairo_new_sub_path( currentContext );
cairo_arc( currentContext, c.x, c.y, r, 0.0, 2 * M_PI);
cairo_close_path( currentContext );
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::DrawArc( const VECTOR2D& aCenterPoint, double aRadius, double aStartAngle,
double aEndAngle )
{
syncLineWidth();
auto c = roundp( xform( aCenterPoint ) );
auto r = ::roundp( xform( aRadius ) );
VECTOR2D startPoint( cos( aStartAngle ) * aRadius + aCenterPoint.x,
sin( aStartAngle ) * aRadius + aCenterPoint.y );
VECTOR2D endPoint( cos( aEndAngle ) * aRadius + aCenterPoint.x,
sin( aEndAngle ) * aRadius + aCenterPoint.y );
auto startPointS = roundp( xform ( startPoint ) );
auto endPointS = roundp( xform ( endPoint ) );
SWAP( aStartAngle, >, aEndAngle );
if( isFillEnabled ) // Draw the filled area of the shape, before drawing the outline itself
{
auto fgcolor = GetStrokeColor();
SetStrokeColor( GetFillColor() );
cairo_set_line_width( currentContext, 1.0 );
cairo_new_sub_path( currentContext );
cairo_arc( currentContext, c.x, c.y, r, aStartAngle, aEndAngle );
cairo_move_to( currentContext, c.x, c.y );
cairo_line_to( currentContext, startPointS.x, startPointS.y );
cairo_line_to( currentContext, endPointS.x, endPointS.y );
cairo_close_path( currentContext );
flushPath();
SetStrokeColor( fgcolor );
}
cairo_set_line_width(currentContext, lineWidthInPixels );
cairo_new_sub_path( currentContext );
cairo_arc( currentContext, c.x, c.y, r, aStartAngle, aEndAngle );
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::DrawRectangle( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
// Calculate the diagonal points
syncLineWidth();
const auto p0 = roundp( xform( aStartPoint ) );
const auto p1 = roundp( xform( aEndPoint ) );
// The path is composed from 4 segments
cairo_move_to( currentContext, p0.x, p0.y );
cairo_line_to( currentContext, p1.x, p0.y );
cairo_line_to( currentContext, p1.x, p1.y );
cairo_line_to( currentContext, p0.x, p1.y );
cairo_close_path( currentContext );
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::DrawPolygon( const SHAPE_POLY_SET& aPolySet )
{
for( int i = 0; i < aPolySet.OutlineCount(); ++i )
drawPoly( aPolySet.COutline( i ) );
}
void CAIRO_GAL_BASE::DrawPolygon( const SHAPE_LINE_CHAIN& aPolygon )
{
drawPoly( aPolygon );
}
void CAIRO_GAL_BASE::DrawCurve( const VECTOR2D& aStartPoint, const VECTOR2D& aControlPointA,
const VECTOR2D& aControlPointB, const VECTOR2D& aEndPoint )
{
syncLineWidth();
const auto sp = roundp( xform( aStartPoint ) );
const auto cpa = roundp( xform( aControlPointA ) );
const auto cpb = roundp( xform( aControlPointB ) );
const auto ep = roundp( xform( aEndPoint ) );
cairo_move_to( currentContext, sp.x, sp.y );
cairo_curve_to( currentContext, cpa.x, cpa.y, cpb.x, cpb.y, ep.x, ep.y );
cairo_line_to( currentContext, ep.x, ep.y );
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::DrawBitmap( const BITMAP_BASE& aBitmap )
{
cairo_save( currentContext );
// We have to calculate the pixel size in users units to draw the image.
// worldUnitLength is a factor used for converting IU to inches
double scale = 1.0 / ( aBitmap.GetPPI() * worldUnitLength );
// The position of the bitmap is the bitmap center.
// move the draw origin to the top left bitmap corner:
int w = aBitmap.GetSizePixels().x;
int h = aBitmap.GetSizePixels().y;
auto matrix = currentWorld2Screen;
// hack: fix the world 2 screen matrix so that our bitmap is placed where it should
// (cairo_translate does not chain transforms)
matrix.xx *= scale;
matrix.yy *= scale;
matrix.x0 -= matrix.xx * (double)w / 2;
matrix.y0 -= matrix.yy * (double)h / 2;
cairo_set_matrix( currentContext, &matrix );
cairo_new_path( currentContext );
cairo_surface_t* image = cairo_image_surface_create( CAIRO_FORMAT_ARGB32, w, h );
cairo_surface_flush( image );
unsigned char* pix_buffer = cairo_image_surface_get_data( image );
// The pixel buffer of the initial bitmap:
auto bm_pix_buffer = (( BITMAP_BASE&)aBitmap).GetImageData();
uint32_t mask_color = ( bm_pix_buffer->GetMaskRed() << 16 )+
( bm_pix_buffer->GetMaskGreen() << 8 ) +
( bm_pix_buffer->GetMaskBlue() );
// Copy the source bitmap to the cairo bitmap buffer.
// In cairo bitmap buffer, a ARGB32 bitmap is an ARGB pixel packed into a uint_32
// 24 low bits only are used for color, top 8 are transparency.
for( int row = 0; row < h; row++ )
{
for( int col = 0; col < w; col++ )
{
// Build the RGB24 pixel:
uint32_t pixel = bm_pix_buffer->GetRed( col, row ) << 16;
pixel += bm_pix_buffer->GetGreen( col, row ) << 8;
pixel += bm_pix_buffer->GetBlue( col, row );
if( bm_pix_buffer->HasAlpha() )
pixel += bm_pix_buffer->GetAlpha( col, row ) << 24;
else if( bm_pix_buffer->HasMask() && pixel == mask_color )
pixel += ( wxALPHA_TRANSPARENT << 24 );
else
pixel += ( wxALPHA_OPAQUE << 24 );
// Write the pixel to the cairo image buffer:
uint32_t* pix_ptr = (uint32_t*) pix_buffer;
*pix_ptr = pixel;
pix_buffer += 4;
}
}
cairo_surface_mark_dirty( image );
cairo_set_source_surface( currentContext, image, 0, 0 );
cairo_paint( currentContext );
cairo_surface_destroy( image );
isElementAdded = true;
cairo_restore( currentContext );
}
void CAIRO_GAL_BASE::ResizeScreen( int aWidth, int aHeight )
{
screenSize = VECTOR2I( aWidth, aHeight );
}
void CAIRO_GAL_BASE::Flush()
{
storePath();
}
void CAIRO_GAL_BASE::ClearScreen()
{
cairo_set_source_rgb( currentContext, m_clearColor.r, m_clearColor.g, m_clearColor.b );
cairo_rectangle( currentContext, 0.0, 0.0, screenSize.x, screenSize.y );
cairo_fill( currentContext );
}
void CAIRO_GAL_BASE::SetIsFill( bool aIsFillEnabled )
{
storePath();
isFillEnabled = aIsFillEnabled;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_FILL;
groupElement.argument.boolArg = aIsFillEnabled;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL_BASE::SetIsStroke( bool aIsStrokeEnabled )
{
storePath();
isStrokeEnabled = aIsStrokeEnabled;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_STROKE;
groupElement.argument.boolArg = aIsStrokeEnabled;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL_BASE::SetStrokeColor( const COLOR4D& aColor )
{
storePath();
strokeColor = aColor;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_STROKECOLOR;
groupElement.argument.dblArg[0] = strokeColor.r;
groupElement.argument.dblArg[1] = strokeColor.g;
groupElement.argument.dblArg[2] = strokeColor.b;
groupElement.argument.dblArg[3] = strokeColor.a;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL_BASE::SetFillColor( const COLOR4D& aColor )
{
storePath();
fillColor = aColor;
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_FILLCOLOR;
groupElement.argument.dblArg[0] = fillColor.r;
groupElement.argument.dblArg[1] = fillColor.g;
groupElement.argument.dblArg[2] = fillColor.b;
groupElement.argument.dblArg[3] = fillColor.a;
currentGroup->push_back( groupElement );
}
}
void CAIRO_GAL_BASE::SetLineWidth( float aLineWidth )
{
storePath();
GAL::SetLineWidth( aLineWidth );
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SET_LINE_WIDTH;
groupElement.argument.dblArg[0] = aLineWidth;
currentGroup->push_back( groupElement );
}
else
{
lineWidth = aLineWidth;
}
}
void CAIRO_GAL_BASE::SetLayerDepth( double aLayerDepth )
{
super::SetLayerDepth( aLayerDepth );
storePath();
}
void CAIRO_GAL_BASE::Transform( const MATRIX3x3D& aTransformation )
{
cairo_matrix_t cairoTransformation, newXform;
cairo_matrix_init( &cairoTransformation,
aTransformation.m_data[0][0],
aTransformation.m_data[1][0],
aTransformation.m_data[0][1],
aTransformation.m_data[1][1],
aTransformation.m_data[0][2],
aTransformation.m_data[1][2] );
cairo_matrix_multiply( &newXform, &currentXform, &cairoTransformation );
currentXform = newXform;
updateWorldScreenMatrix();
}
void CAIRO_GAL_BASE::Rotate( double aAngle )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_ROTATE;
groupElement.argument.dblArg[0] = aAngle;
currentGroup->push_back( groupElement );
}
else
{
cairo_matrix_rotate( &currentXform, aAngle );
updateWorldScreenMatrix();
}
}
void CAIRO_GAL_BASE::Translate( const VECTOR2D& aTranslation )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_TRANSLATE;
groupElement.argument.dblArg[0] = aTranslation.x;
groupElement.argument.dblArg[1] = aTranslation.y;
currentGroup->push_back( groupElement );
}
else
{
cairo_matrix_translate ( &currentXform, aTranslation.x, aTranslation.y );
updateWorldScreenMatrix();
}
}
void CAIRO_GAL_BASE::Scale( const VECTOR2D& aScale )
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SCALE;
groupElement.argument.dblArg[0] = aScale.x;
groupElement.argument.dblArg[1] = aScale.y;
currentGroup->push_back( groupElement );
}
else
{
cairo_matrix_scale( &currentXform, aScale.x, aScale.y );
updateWorldScreenMatrix();
}
}
void CAIRO_GAL_BASE::Save()
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_SAVE;
currentGroup->push_back( groupElement );
}
else
{
xformStack.push_back( currentXform );
updateWorldScreenMatrix();
}
}
void CAIRO_GAL_BASE::Restore()
{
storePath();
if( isGrouping )
{
GROUP_ELEMENT groupElement;
groupElement.command = CMD_RESTORE;
currentGroup->push_back( groupElement );
}
else
{
if( !xformStack.empty() )
{
currentXform = xformStack.back();
xformStack.pop_back();
updateWorldScreenMatrix();
}
}
}
int CAIRO_GAL_BASE::BeginGroup()
{
// If the grouping is started: the actual path is stored in the group, when
// a attribute was changed or when grouping stops with the end group method.
storePath();
GROUP group;
int groupNumber = getNewGroupNumber();
groups.insert( std::make_pair( groupNumber, group ) );
currentGroup = &groups[groupNumber];
isGrouping = true;
return groupNumber;
}
void CAIRO_GAL_BASE::EndGroup()
{
storePath();
isGrouping = false;
}
void CAIRO_GAL_BASE::DrawGroup( int aGroupNumber )
{
// This method implements a small Virtual Machine - all stored commands
// are executed; nested calling is also possible
storePath();
for( GROUP::iterator it = groups[aGroupNumber].begin();
it != groups[aGroupNumber].end(); ++it )
{
switch( it->command )
{
case CMD_SET_FILL:
isFillEnabled = it->argument.boolArg;
break;
case CMD_SET_STROKE:
isStrokeEnabled = it->argument.boolArg;
break;
case CMD_SET_FILLCOLOR:
fillColor = COLOR4D( it->argument.dblArg[0], it->argument.dblArg[1], it->argument.dblArg[2],
it->argument.dblArg[3] );
break;
case CMD_SET_STROKECOLOR:
strokeColor = COLOR4D( it->argument.dblArg[0], it->argument.dblArg[1], it->argument.dblArg[2],
it->argument.dblArg[3] );
break;
case CMD_SET_LINE_WIDTH:
{
// Make lines appear at least 1 pixel wide, no matter of zoom
double x = 1.0, y = 1.0;
cairo_device_to_user_distance( currentContext, &x, &y );
double minWidth = std::min( fabs( x ), fabs( y ) );
cairo_set_line_width( currentContext, std::max( it->argument.dblArg[0], minWidth ) );
}
break;
case CMD_STROKE_PATH:
cairo_set_source_rgba( currentContext, strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
cairo_append_path( currentContext, it->cairoPath );
cairo_stroke( currentContext );
break;
case CMD_FILL_PATH:
cairo_set_source_rgba( currentContext, fillColor.r, fillColor.g, fillColor.b, strokeColor.a );
cairo_append_path( currentContext, it->cairoPath );
cairo_fill( currentContext );
break;
/*
case CMD_TRANSFORM:
cairo_matrix_t matrix;
cairo_matrix_init( &matrix, it->argument.dblArg[0], it->argument.dblArg[1], it->argument.dblArg[2],
it->argument.dblArg[3], it->argument.dblArg[4], it->argument.dblArg[5] );
cairo_transform( currentContext, &matrix );
break;
*/
case CMD_ROTATE:
cairo_rotate( currentContext, it->argument.dblArg[0] );
break;
case CMD_TRANSLATE:
cairo_translate( currentContext, it->argument.dblArg[0], it->argument.dblArg[1] );
break;
case CMD_SCALE:
cairo_scale( currentContext, it->argument.dblArg[0], it->argument.dblArg[1] );
break;
case CMD_SAVE:
cairo_save( currentContext );
break;
case CMD_RESTORE:
cairo_restore( currentContext );
break;
case CMD_CALL_GROUP:
DrawGroup( it->argument.intArg );
break;
}
}
}
void CAIRO_GAL_BASE::ChangeGroupColor( int aGroupNumber, const COLOR4D& aNewColor )
{
storePath();
for( GROUP::iterator it = groups[aGroupNumber].begin();
it != groups[aGroupNumber].end(); ++it )
{
if( it->command == CMD_SET_FILLCOLOR || it->command == CMD_SET_STROKECOLOR )
{
it->argument.dblArg[0] = aNewColor.r;
it->argument.dblArg[1] = aNewColor.g;
it->argument.dblArg[2] = aNewColor.b;
it->argument.dblArg[3] = aNewColor.a;
}
}
}
void CAIRO_GAL_BASE::ChangeGroupDepth( int aGroupNumber, int aDepth )
{
// Cairo does not have any possibilities to change the depth coordinate of stored items,
// it depends only on the order of drawing
}
void CAIRO_GAL_BASE::DeleteGroup( int aGroupNumber )
{
storePath();
// Delete the Cairo paths
std::deque<GROUP_ELEMENT>::iterator it, end;
for( it = groups[aGroupNumber].begin(), end = groups[aGroupNumber].end(); it != end; ++it )
{
if( it->command == CMD_FILL_PATH || it->command == CMD_STROKE_PATH )
{
cairo_path_destroy( it->cairoPath );
}
}
// Delete the group
groups.erase( aGroupNumber );
}
void CAIRO_GAL_BASE::ClearCache()
{
for( auto it = groups.begin(); it != groups.end(); )
DeleteGroup( ( it++ )->first );
}
void CAIRO_GAL_BASE::SetNegativeDrawMode( bool aSetting )
{
cairo_set_operator( currentContext, aSetting ? CAIRO_OPERATOR_CLEAR : CAIRO_OPERATOR_OVER );
}
void CAIRO_GAL_BASE::DrawCursor( const VECTOR2D& aCursorPosition )
{
cursorPosition = aCursorPosition;
}
void CAIRO_GAL_BASE::EnableDepthTest( bool aEnabled )
{
}
void CAIRO_GAL_BASE::resetContext()
{
ClearScreen();
// Compute the world <-> screen transformations
ComputeWorldScreenMatrix();
cairo_matrix_init( &cairoWorldScreenMatrix, worldScreenMatrix.m_data[0][0],
worldScreenMatrix.m_data[1][0], worldScreenMatrix.m_data[0][1],
worldScreenMatrix.m_data[1][1], worldScreenMatrix.m_data[0][2],
worldScreenMatrix.m_data[1][2] );
// we work in screen-space coordinates and do the transforms outside.
cairo_identity_matrix( context );
cairo_matrix_init_identity( &currentXform );
// Start drawing with a new path
cairo_new_path( context );
isElementAdded = true;
updateWorldScreenMatrix();
lineWidth = 0;
}
void CAIRO_GAL_BASE::drawGridLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoint )
{
auto p0 = roundp( xform( aStartPoint ) );
auto p1 = roundp( xform( aEndPoint ) );
syncLineWidth();
cairo_move_to( currentContext, p0.x, p0.y );
cairo_line_to( currentContext, p1.x, p1.y );
cairo_set_source_rgba( currentContext, strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
cairo_stroke( currentContext );
}
void CAIRO_GAL_BASE::drawGridPoint( const VECTOR2D& aPoint, double aSize )
{
auto p = roundp( xform( aPoint ) );
auto s = aSize / 2.0;
if( (((int)aSize) % 2) == 0 ) // s even
{
p += VECTOR2D( 0.5, 0.5 );
}
cairo_set_line_join( currentContext, CAIRO_LINE_JOIN_MITER );
cairo_set_line_cap( currentContext, CAIRO_LINE_CAP_BUTT );
cairo_set_line_width( currentContext, 1.0 ); //floor( aSize + 0.5 ) - 0.5 );
cairo_move_to( currentContext, p.x - s, p.y - s);
cairo_line_to( currentContext, p.x + s, p.y - s);
cairo_line_to( currentContext, p.x + s, p.y + s);
cairo_line_to( currentContext, p.x - s, p.y + s);
cairo_close_path( currentContext );
cairo_fill( currentContext );
}
void CAIRO_GAL_BASE::flushPath()
{
if( isFillEnabled )
{
cairo_set_source_rgba( currentContext,
fillColor.r, fillColor.g, fillColor.b, fillColor.a );
if( isStrokeEnabled )
cairo_fill_preserve( currentContext );
else
cairo_fill( currentContext );
}
if( isStrokeEnabled )
{
cairo_set_source_rgba( currentContext,
strokeColor.r, strokeColor.g, strokeColor.b, strokeColor.a );
cairo_stroke( currentContext );
}
}
void CAIRO_GAL_BASE::storePath()
{
if( isElementAdded )
{
isElementAdded = false;
if( !isGrouping )
{
if( isFillEnabled )
{
cairo_set_source_rgba( currentContext, fillColor.r, fillColor.g, fillColor.b, fillColor.a );
cairo_fill_preserve( currentContext );
}
if( isStrokeEnabled )
{
cairo_set_source_rgba( currentContext, strokeColor.r, strokeColor.g,
strokeColor.b, strokeColor.a );
cairo_stroke_preserve( currentContext );
}
}
else
{
// Copy the actual path, append it to the global path list
// then check, if the path needs to be stroked/filled and
// add this command to the group list;
if( isStrokeEnabled )
{
GROUP_ELEMENT groupElement;
groupElement.cairoPath = cairo_copy_path( currentContext );
groupElement.command = CMD_STROKE_PATH;
currentGroup->push_back( groupElement );
}
if( isFillEnabled )
{
GROUP_ELEMENT groupElement;
groupElement.cairoPath = cairo_copy_path( currentContext );
groupElement.command = CMD_FILL_PATH;
currentGroup->push_back( groupElement );
}
}
cairo_new_path( currentContext );
}
}
void CAIRO_GAL_BASE::blitCursor( wxMemoryDC& clientDC )
{
if( !IsCursorEnabled() )
return;
auto p = ToScreen( cursorPosition );
const auto cColor = getCursorColor();
const int cursorSize = fullscreenCursor ? 8000 : 80;
wxColour color( cColor.r * cColor.a * 255, cColor.g * cColor.a * 255,
cColor.b * cColor.a * 255, 255 );
clientDC.SetPen( wxPen( color ) );
clientDC.DrawLine( p.x - cursorSize / 2, p.y, p.x + cursorSize / 2, p.y );
clientDC.DrawLine( p.x, p.y - cursorSize / 2, p.x, p.y + cursorSize / 2 );
}
void CAIRO_GAL_BASE::drawPoly( const std::deque<VECTOR2D>& aPointList )
{
// Iterate over the point list and draw the segments
std::deque<VECTOR2D>::const_iterator it = aPointList.begin();
syncLineWidth();
const auto p = roundp( xform( it->x, it->y ) );
cairo_move_to( currentContext, p.x, p.y );
for( ++it; it != aPointList.end(); ++it )
{
const auto p2 = roundp( xform( it->x, it->y ) );
cairo_line_to( currentContext, p2.x, p2.y );
}
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::drawPoly( const VECTOR2D aPointList[], int aListSize )
{
// Iterate over the point list and draw the segments
const VECTOR2D* ptr = aPointList;
syncLineWidth();
const auto p = roundp( xform( ptr->x, ptr->y ) );
cairo_move_to( currentContext, p.x, p.y );
for( int i = 0; i < aListSize; ++i )
{
++ptr;
const auto p2 = roundp( xform( ptr->x, ptr->y ) );
cairo_line_to( currentContext, p2.x, p2.y );
}
flushPath();
isElementAdded = true;
}
void CAIRO_GAL_BASE::drawPoly( const SHAPE_LINE_CHAIN& aLineChain )
{
if( aLineChain.PointCount() < 2 )
return;
syncLineWidth();
auto numPoints = aLineChain.PointCount();
if( aLineChain.IsClosed() )
numPoints += 1;
const VECTOR2I start = aLineChain.CPoint( 0 );
const auto p = roundp( xform( start.x, start.y ) );
cairo_move_to( currentContext, p.x, p.y );
for( int i = 1; i < numPoints; ++i )
{
const VECTOR2I& pw = aLineChain.CPoint( i );
const auto ps = roundp( xform( pw.x, pw.y ) );
cairo_line_to( currentContext, ps.x, ps.y );
}
flushPath();
isElementAdded = true;
}
unsigned int CAIRO_GAL_BASE::getNewGroupNumber()
{
wxASSERT_MSG( groups.size() < std::numeric_limits<unsigned int>::max(),
wxT( "There are no free slots to store a group" ) );
while( groups.find( groupCounter ) != groups.end() )
groupCounter++;
return groupCounter++;
}
CAIRO_GAL::CAIRO_GAL( GAL_DISPLAY_OPTIONS& aDisplayOptions,
wxWindow* aParent, wxEvtHandler* aMouseListener,
wxEvtHandler* aPaintListener, const wxString& aName ) :
CAIRO_GAL_BASE( aDisplayOptions ),
wxWindow( aParent, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxEXPAND, aName )
{
// Initialise compositing state
mainBuffer = 0;
overlayBuffer = 0;
validCompositor = false;
SetTarget( TARGET_NONCACHED );
parentWindow = aParent;
mouseListener = aMouseListener;
paintListener = aPaintListener;
// Connecting the event handlers
Connect( wxEVT_PAINT, wxPaintEventHandler( CAIRO_GAL::onPaint ) );
// Mouse events are skipped to the parent
Connect( wxEVT_MOTION, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_LEFT_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MIDDLE_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DOWN, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_UP, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_RIGHT_DCLICK, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
Connect( wxEVT_MOUSEWHEEL, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
#if defined _WIN32 || defined _WIN64
Connect( wxEVT_ENTER_WINDOW, wxMouseEventHandler( CAIRO_GAL::skipMouseEvent ) );
#endif
SetSize( aParent->GetClientSize() );
screenSize = VECTOR2I( aParent->GetClientSize() );
// Allocate memory for pixel storage
allocateBitmaps();
isInitialized = false;
}
CAIRO_GAL::~CAIRO_GAL()
{
deleteBitmaps();
}
void CAIRO_GAL::beginDrawing()
{
initSurface();
CAIRO_GAL_BASE::beginDrawing();
if( !validCompositor )
setCompositor();
compositor->SetMainContext( context );
compositor->SetBuffer( mainBuffer );
}
void CAIRO_GAL::endDrawing()
{
CAIRO_GAL_BASE::endDrawing();
// Merge buffers on the screen
compositor->DrawBuffer( mainBuffer );
compositor->DrawBuffer( overlayBuffer );
// Now translate the raw context data from the format stored
// by cairo into a format understood by wxImage.
pixman_image_t* dstImg = pixman_image_create_bits( PIXMAN_r8g8b8,
screenSize.x, screenSize.y, (uint32_t*) wxOutput, wxBufferWidth * 3 );
pixman_image_t* srcImg = pixman_image_create_bits( PIXMAN_a8b8g8r8,
screenSize.x, screenSize.y, (uint32_t*) bitmapBuffer, wxBufferWidth * 4 );
pixman_image_composite( PIXMAN_OP_SRC, srcImg, NULL, dstImg,
0, 0, 0, 0, 0, 0, screenSize.x, screenSize.y );
// Free allocated memory
pixman_image_unref( srcImg );
pixman_image_unref( dstImg );
wxImage img( wxBufferWidth, screenSize.y, (unsigned char*) wxOutput, true );
wxBitmap bmp( img );
wxMemoryDC mdc( bmp );
wxClientDC clientDC( this );
// Now it is the time to blit the mouse cursor
blitCursor( mdc );
clientDC.Blit( 0, 0, screenSize.x, screenSize.y, &mdc, 0, 0, wxCOPY );
deinitSurface();
}
void CAIRO_GAL::ResizeScreen( int aWidth, int aHeight )
{
CAIRO_GAL_BASE::ResizeScreen( aWidth, aHeight );
// Recreate the bitmaps
deleteBitmaps();
allocateBitmaps();
if( validCompositor )
compositor->Resize( aWidth, aHeight );
validCompositor = false;
SetSize( wxSize( aWidth, aHeight ) );
}
bool CAIRO_GAL::Show( bool aShow )
{
bool s = wxWindow::Show( aShow );
if( aShow )
wxWindow::Raise();
return s;
}
void CAIRO_GAL::SaveScreen()
{
// Copy the current bitmap to the backup buffer
int offset = 0;
for( int j = 0; j < screenSize.y; j++ )
{
for( int i = 0; i < stride; i++ )
{
bitmapBufferBackup[offset + i] = bitmapBuffer[offset + i];
offset += stride;
}
}
}
void CAIRO_GAL::RestoreScreen()
{
int offset = 0;
for( int j = 0; j < screenSize.y; j++ )
{
for( int i = 0; i < stride; i++ )
{
bitmapBuffer[offset + i] = bitmapBufferBackup[offset + i];
offset += stride;
}
}
}
int CAIRO_GAL::BeginGroup()
{
initSurface();
return CAIRO_GAL_BASE::BeginGroup();
}
void CAIRO_GAL::EndGroup()
{
CAIRO_GAL_BASE::EndGroup();
deinitSurface();
}
void CAIRO_GAL::SetTarget( RENDER_TARGET aTarget )
{
// If the compositor is not set, that means that there is a recaching process going on
// and we do not need the compositor now
if( !validCompositor )
return;
// Cairo grouping prevents display of overlapping items on the same layer in the lighter color
if( isInitialized )
storePath();
switch( aTarget )
{
default:
case TARGET_CACHED:
case TARGET_NONCACHED:
compositor->SetBuffer( mainBuffer );
break;
case TARGET_OVERLAY:
compositor->SetBuffer( overlayBuffer );
break;
}
currentTarget = aTarget;
}
RENDER_TARGET CAIRO_GAL::GetTarget() const
{
return currentTarget;
}
void CAIRO_GAL::ClearTarget( RENDER_TARGET aTarget )
{
// Save the current state
unsigned int currentBuffer = compositor->GetBuffer();
switch( aTarget )
{
// Cached and noncached items are rendered to the same buffer
default:
case TARGET_CACHED:
case TARGET_NONCACHED:
compositor->SetBuffer( mainBuffer );
break;
case TARGET_OVERLAY:
compositor->SetBuffer( overlayBuffer );
break;
}
compositor->ClearBuffer( COLOR4D::BLACK );
// Restore the previous state
compositor->SetBuffer( currentBuffer );
}
void CAIRO_GAL::initSurface()
{
if( isInitialized )
return;
surface = cairo_image_surface_create_for_data( (unsigned char*) bitmapBuffer, GAL_FORMAT,
wxBufferWidth, screenSize.y, stride );
context = cairo_create( surface );
#ifdef __WXDEBUG__
cairo_status_t status = cairo_status( context );
wxASSERT_MSG( status == CAIRO_STATUS_SUCCESS, wxT( "Cairo context creation error" ) );
#endif /* __WXDEBUG__ */
currentContext = context;
isInitialized = true;
}
void CAIRO_GAL::deinitSurface()
{
if( !isInitialized )
return;
cairo_destroy( context );
context = nullptr;
cairo_surface_destroy( surface );
surface = nullptr;
isInitialized = false;
}
void CAIRO_GAL::allocateBitmaps()
{
wxBufferWidth = screenSize.x;
while( ( ( wxBufferWidth * 3 ) % 4 ) != 0 ) wxBufferWidth++;
// Create buffer, use the system independent Cairo context backend
stride = cairo_format_stride_for_width( GAL_FORMAT, wxBufferWidth );
bufferSize = stride * screenSize.y;
bitmapBuffer = new unsigned int[bufferSize];
bitmapBufferBackup = new unsigned int[bufferSize];
wxOutput = new unsigned char[wxBufferWidth * 3 * screenSize.y];
}
void CAIRO_GAL::deleteBitmaps()
{
delete[] bitmapBuffer;
delete[] bitmapBufferBackup;
delete[] wxOutput;
}
void CAIRO_GAL::setCompositor()
{
// Recreate the compositor with the new Cairo context
compositor.reset( new CAIRO_COMPOSITOR( &currentContext ) );
compositor->Resize( screenSize.x, screenSize.y );
compositor->SetAntialiasingMode( options.cairo_antialiasing_mode );
// Prepare buffers
mainBuffer = compositor->CreateBuffer();
overlayBuffer = compositor->CreateBuffer();
validCompositor = true;
}
void CAIRO_GAL::onPaint( wxPaintEvent& WXUNUSED( aEvent ) )
{
PostPaint();
}
void CAIRO_GAL::skipMouseEvent( wxMouseEvent& aEvent )
{
// Post the mouse event to the event listener registered in constructor, if any
if( mouseListener )
wxPostEvent( mouseListener, aEvent );
}
bool CAIRO_GAL::updatedGalDisplayOptions( const GAL_DISPLAY_OPTIONS& aOptions )
{
bool refresh = false;
if( validCompositor && aOptions.cairo_antialiasing_mode != compositor->GetAntialiasingMode() )
{
compositor->SetAntialiasingMode( options.cairo_antialiasing_mode );
validCompositor = false;
deinitSurface();
refresh = true;
}
if( super::updatedGalDisplayOptions( aOptions ) )
{
Refresh();
refresh = true;
}
return refresh;
}
void CAIRO_GAL_BASE::DrawGrid()
{
SetTarget( TARGET_NONCACHED );
// Draw the grid
// For the drawing the start points, end points and increments have
// to be calculated in world coordinates
VECTOR2D worldStartPoint = screenWorldMatrix * VECTOR2D( 0.0, 0.0 );
VECTOR2D worldEndPoint = screenWorldMatrix * VECTOR2D( screenSize );
const double gridThreshold = computeMinGridSpacing();
int gridScreenSizeDense = KiROUND( gridSize.x * worldScale );
int gridScreenSizeCoarse = KiROUND( gridSize.x * static_cast<double>( gridTick ) * worldScale );
// Compute the line marker or point radius of the grid
// Note: generic grids can't handle sub-pixel lines without
// either losing fine/course distinction or having some dots
// fail to render
float marker = std::fmax( 1.0f, gridLineWidth ) / worldScale;
float doubleMarker = 2.0f * marker;
// Draw axes if desired
if( axesEnabled )
{
SetIsFill( false );
SetIsStroke( true );
SetStrokeColor( axesColor );
SetLineWidth( marker );
drawGridLine( VECTOR2D( worldStartPoint.x, 0 ),
VECTOR2D( worldEndPoint.x, 0 ) );
drawGridLine( VECTOR2D( 0, worldStartPoint.y ),
VECTOR2D( 0, worldEndPoint.y ) );
}
if( !gridVisibility )
return;
// Check if the grid would not be too dense
if( std::max( gridScreenSizeDense, gridScreenSizeCoarse ) <= gridThreshold )
return;
// Compute grid staring and ending indexes to draw grid points on the
// visible screen area
// Note: later any point coordinate will be offsetted by gridOrigin
int gridStartX = KiROUND( ( worldStartPoint.x - gridOrigin.x ) / gridSize.x );
int gridEndX = KiROUND( ( worldEndPoint.x - gridOrigin.x ) / gridSize.x );
int gridStartY = KiROUND( ( worldStartPoint.y - gridOrigin.y ) / gridSize.y );
int gridEndY = KiROUND( ( worldEndPoint.y - gridOrigin.y ) / gridSize.y );
// Ensure start coordinate > end coordinate
if( gridStartX > gridEndX )
std::swap( gridStartX, gridEndX );
if( gridStartY > gridEndY )
std::swap( gridStartY, gridEndY );
// Ensure the grid fills the screen
--gridStartX; ++gridEndX;
--gridStartY; ++gridEndY;
// Draw the grid behind all other layers
SetLayerDepth( depthRange.y * 0.75 );
if( gridStyle == GRID_STYLE::LINES )
{
SetIsFill( false );
SetIsStroke( true );
SetStrokeColor( gridColor );
// Now draw the grid, every coarse grid line gets the double width
// Vertical lines
for( int j = gridStartY; j <= gridEndY; j++ )
{
const double y = j * gridSize.y + gridOrigin.y;
if( axesEnabled && y == 0 )
continue;
if( j % gridTick == 0 && gridScreenSizeDense > gridThreshold )
SetLineWidth( doubleMarker );
else
SetLineWidth( marker );
if( ( j % gridTick == 0 && gridScreenSizeCoarse > gridThreshold )
|| gridScreenSizeDense > gridThreshold )
{
drawGridLine( VECTOR2D( gridStartX * gridSize.x + gridOrigin.x, y ),
VECTOR2D( gridEndX * gridSize.x + gridOrigin.x, y ) );
}
}
// Horizontal lines
for( int i = gridStartX; i <= gridEndX; i++ )
{
const double x = i * gridSize.x + gridOrigin.x;
if( axesEnabled && x == 0 )
continue;
if( i % gridTick == 0 && gridScreenSizeDense > gridThreshold )
SetLineWidth( doubleMarker );
else
SetLineWidth( marker );
if( ( i % gridTick == 0 && gridScreenSizeCoarse > gridThreshold )
|| gridScreenSizeDense > gridThreshold )
{
drawGridLine( VECTOR2D( x, gridStartY * gridSize.y + gridOrigin.y ),
VECTOR2D( x, gridEndY * gridSize.y + gridOrigin.y ) );
}
}
}
else if( gridStyle == GRID_STYLE::SMALL_CROSS )
{
SetIsFill( false );
SetIsStroke( true );
SetStrokeColor( gridColor );
SetLineWidth( marker );
double lineLen = GetLineWidth() * 2;
// Vertical positions:
for( int j = gridStartY; j <= gridEndY; j++ )
{
if( ( j % gridTick == 0 && gridScreenSizeCoarse > gridThreshold )
|| gridScreenSizeDense > gridThreshold )
{
int posY = j * gridSize.y + gridOrigin.y;
// Horizontal positions:
for( int i = gridStartX; i <= gridEndX; i++ )
{
if( ( i % gridTick == 0 && gridScreenSizeCoarse > gridThreshold )
|| gridScreenSizeDense > gridThreshold )
{
int posX = i * gridSize.x + gridOrigin.x;
drawGridLine( VECTOR2D( posX - lineLen, posY ),
VECTOR2D( posX + lineLen, posY ) );
drawGridLine( VECTOR2D( posX, posY - lineLen ),
VECTOR2D( posX, posY + lineLen ) );
}
}
}
}
}
else // Dotted grid
{
bool tickX, tickY;
SetIsFill( true );
SetIsStroke( false );
SetFillColor( gridColor );
for( int j = gridStartY; j <= gridEndY; j++ )
{
if( j % gridTick == 0 && gridScreenSizeDense > gridThreshold )
tickY = true;
else
tickY = false;
for( int i = gridStartX; i <= gridEndX; i++ )
{
if( i % gridTick == 0 && gridScreenSizeDense > gridThreshold )
tickX = true;
else
tickX = false;
if( tickX || tickY || gridScreenSizeDense > gridThreshold )
{
double radius = ( ( tickX && tickY ) ? 2.0 : 1.0 );
drawGridPoint( VECTOR2D( i * gridSize.x + gridOrigin.x,
j * gridSize.y + gridOrigin.y ), radius );
}
}
}
}
}
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