/* gcc -framework Cocoa -lobjc `pkg-config --cflags --libs cairo` cairo.m -o cairo
 *
 * The cairo code is adapted from the clearlooks theme, to reproduce an error:
 * <Error>: CGBitmapContextGetBitsPerPixel: invalid context
 *
 */

#import <Cocoa/Cocoa.h>
#include <cairo/cairo-quartz.h>

@interface TestView: NSView
{
}
@end

@implementation TestView

- (id)initWithFrame:(NSRect)frameRect
{
  self = [super initWithFrame:frameRect];

  return self;
}

- (BOOL)isOpaque
{
  return NO;
}

- (void)drawRect:(NSRect)rect
{
  int width, height;
  CGContextRef context;
  cairo_surface_t *surface;
  cairo_t *cr;
  cairo_pattern_t *pattern;
  cairo_matrix_t matrix;

  width = [self bounds].size.width;
  height = [self bounds].size.height;

  context = [[NSGraphicsContext currentContext] graphicsPort];
  CGContextTranslateCTM (context, 0.0, height);
  CGContextScaleCTM (context, 1.0, -1.0);

  surface = cairo_quartz_surface_create_for_cg_context (context, width, height);
  cr = cairo_create (surface);

  /* This transformation seems to be what triggers the error: */
  cairo_matrix_init (&matrix, 0, 1, 1, 0, 0, 0);
  cairo_transform (cr, &matrix);
      
  pattern = cairo_pattern_create_linear (1, 1, 1, height - 2);
  cairo_pattern_add_color_stop_rgb (pattern, 0,   0, 0, 0);
  cairo_pattern_add_color_stop_rgb (pattern, 0.5, 0.5, 0.5, 0.5);
  cairo_pattern_add_color_stop_rgb (pattern, 1,   1, 1, 1);
  cairo_rectangle (cr, 1, 1, width - 2, height - 2);
  cairo_set_source (cr, pattern);
  cairo_fill (cr);
  cairo_pattern_destroy (pattern);

  cairo_destroy (cr);
  cairo_surface_destroy (surface);
}

@end

int
main (int argc, char **argv)
{
  NSAutoreleasePool *pool;
  int style;
  NSWindow *window;
  NSView *view;

  pool = [[NSAutoreleasePool alloc] init];

  [NSApplication sharedApplication];
    
  style = 
    NSTitledWindowMask | NSMiniaturizableWindowMask;
  window = [[NSWindow alloc] initWithContentRect:NSMakeRect(100, 100, 300, 300)
                                       styleMask:style
                                         backing:NSBackingStoreBuffered
                                           defer:NO];

  view = [[TestView alloc] init];
    
  [window setContentView: view];
  [window makeKeyAndOrderFront:window];

  [NSApp run];

  [pool release];
  
  return 0;
}