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Bug #37636 GdkPixbuf::new_from_gd transfers red colors only
Submitted: 2006-05-30 04:33 UTC Modified: 2006-09-09 20:49 UTC
From: cweiske@php.net Assigned:
Status: Closed Package: PHP-GTK related
PHP Version: 5.1.4 OS: Linux
Private report: No CVE-ID: None
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 [2006-05-30 04:33 UTC] cweiske@php.net 
Description:
------------
GdkPixbuf::new_from_gd() seems to transfer the red parts of the picture to the pixbuf. Even when there is a black line, it appears light grey on the pixbuf.

Reproduce code:
---------------
<?php
//image_graph multiple plots usage example
error_reporting(E_ALL);
include 'Image/Graph.php';
// create the graph
$Graph =& Image_Graph::factory('graph', array(600, 400));
// add a TrueType font
$Font =& $Graph->addNew('font', 'Verdana');
// set the font size to 11 pixels
$Font->setSize(8);

$Graph->setFont($Font);

// create the plotarea
$Graph->add(
    Image_Graph::vertical(
        Image_Graph::vertical(
            $Title = Image_Graph::factory('title', array('Multiple Plots', 11)),
            $SubTitle = Image_Graph::factory('title', array('This is a demonstration of title alignment', 7)),
            90
        ),
        $Plotarea = Image_Graph::factory('plotarea'),
        8
    )
);	
$Title->setAlignment(IMAGE_GRAPH_ALIGN_LEFT);
$SubTitle->setAlignment(IMAGE_GRAPH_ALIGN_LEFT);
   
$Grid =& $Plotarea->addNew('bar_grid', IMAGE_GRAPH_AXIS_Y);
$Grid->setFillStyle(Image_Graph::factory('gradient', array(IMAGE_GRAPH_GRAD_VERTICAL, 'white', 'lightgrey')));    
	
$Plot =& $Plotarea->addNew('Image_Graph_Plot_Smoothed_Area', Image_Graph::factory('random', array(10, 20, 100, true)));
$Plot->setFillColor('red@0.2');

$Plot =& $Plotarea->addNew('line', Image_Graph::factory('random', array(10, 20, 100, true)));
$Plot->setLineColor('blue@0.2');
$CircleMarker =& Image_Graph::factory('Image_Graph_Marker_Circle');
$Plot->setMarker($CircleMarker);
$CircleMarker->setFillColor('white@0.4');
    
$Plot =& $Plotarea->addNew('bar', Image_Graph::factory('random', array(10, 2, 40, true)));
$Plot->setFillColor('green@0.2');
$Marker =& Image_Graph::factory('Image_Graph_Marker_Value', IMAGE_GRAPH_VALUE_Y);
$Plot->setMarker($Marker);
$Marker->setFillColor('white');
$Marker->setBorderColor('black');
    
$AxisY = $Plotarea->getAxis(IMAGE_GRAPH_AXIS_Y);
$AxisY->showArrow();

$Array = array(
    "Jan-Feb\n2004", 
    "Mar-Apr\n2004", 
    "May-Jun\n2004", 
    "Jul-Aug\n2004", 
    "Sep-Oct\n2004", 
    "Nov-Dev\n2004", 
    "Jan-Feb\n2005", 
    "Mar-Apr\n2005", 
    "May-Jun\n2005", 
    "Jul-Aug\n2005" 
);
$AxisX = $Plotarea->getAxis(IMAGE_GRAPH_AXIS_X);
$AxisX->setDataPreprocessor(Image_Graph::factory('Image_Graph_DataPreprocessor_Array', array($Array)));



//that is a critical line. Setting the output to "none" is important
$Graph->done(array('output' => 'none'));
$canvas = $Graph->_getCanvas();
$gd = $canvas->_canvas;
$pixbuf = GdkPixbuf::new_from_gd($gd);

$wnd = new GtkWindow();
$wnd->connect_simple('destroy', array('Gtk', 'main_quit'));
$wnd->add(GtkImage::new_from_pixbuf($pixbuf));
$wnd->show_all();
Gtk::main();
?>

Expected result:
----------------
http://xml.cweiske.de/2006-05-30%20multiple_slots_original.png

Actual result:
--------------
http://xml.cweiske.de/2006-05-30%20multiple_slots_gtk.png

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 [2006-06-03 18:55 UTC] andrei@php.net 
Can you provide a shorter example without using Image_Graph? My tests show that everything transfers fine.

<?php

$w = new GtkWindow();
$w->connect_simple('destroy', array('gtk', 'main_quit'));

$values = array(
           40,  50,  // Point 1 (x, y)
           20,  240, // Point 2 (x, y)
           60,  60,  // Point 3 (x, y)
           240, 20,  // Point 4 (x, y)
           50,  40,  // Point 5 (x, y)
           10,  10  // Point 6 (x, y)
           );

// create image
$image = imagecreatetruecolor(250, 250);

// some colors
$bg  = imagecolorallocate($image, 200, 200, 200);
imagefill($image, 0, 0, $bg);
imagecolortransparent($image, $bg);
$blue = imagecolorallocate($image, 150, 90, 255);

// draw a polygon
imagefilledpolygon($image, $values, 6, $blue);

$pixbuf = GdkPixbuf::new_from_gd($image);

$b = new GtkButton();
$pixmap = GtkImage::new_from_pixbuf($pixbuf);
$b->add($pixmap);
$w->add($b);
$w->show_all();

gtk::main();
 [2006-06-09 18:26 UTC] cweiske@php.net 
Even your example shows the wrong colors.
See: http://xml.cweiske.de/2006-06-09%20new_from_gd%20wrong%20colors.png

Try to set the colors to:
$bg  = imagecolorallocate($image, 0, 255, 0);
$blue = imagecolorallocate($image, 0, 0, 255);

which have no red in them. The image will be totally transparent
 [2006-06-09 20:28 UTC] cweiske@php.net 
Since it works on Andrei's laptop (a Macbook with G4 processor), but not on my pc nor on scott's pc, I assume it's an endian problem. The bits are in the wrong order for PCs.
 [2006-09-09 20:23 UTC] andrei@php.net 
I committed what I think is the correct fix to gdk.overrides. Please test and report back.
 [2006-09-09 20:49 UTC] cweiske@php.net 
works fine.
 
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