/*
  gcc -framework Cocoa -lobjc `pkg-config --cflags --libs cairo` text-gradient.m -o text-gradient
 */

#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
{
  NSRect bounds = [self bounds];
  int width = bounds.size.width;
  int height = bounds.size.height;

  CGContextRef ctx = (CGContextRef)[[NSGraphicsContext
                                      currentContext] graphicsPort];

  CGContextTranslateCTM (ctx, 0.0, height);
  CGContextScaleCTM (ctx, 1.0, -1.0);

  cairo_surface_t *surface = cairo_quartz_surface_create_for_cg_context (ctx, width, height);
  cairo_t *cr = cairo_create (surface);
  cairo_pattern_t *pattern;

  pattern = cairo_pattern_create_linear (0, 0, width, height);

  cairo_pattern_add_color_stop_rgb (pattern, 0, 0, 0, 0);
  cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 1, 1);

  /* Not using the pattern results in a nice readable text, using it
   * garbles things up somehow.
   */
  cairo_set_source (cr, pattern);

  cairo_move_to (cr, 10, 10);
  cairo_show_text (cr, "Testing a bit with some text and a gradient");

  cairo_pattern_destroy (pattern);
  cairo_destroy (cr);
  cairo_surface_destroy (surface);
}

@end

int
main (int argc, char **argv)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSWindow          *window;
    NSView            *view;

    [NSApplication sharedApplication];

    window = [[NSWindow alloc] initWithContentRect:NSMakeRect(100, 100, 200, 100)
                                         styleMask:NSTitledWindowMask
                                           backing:NSBackingStoreBuffered
                                             defer:NO];

    view = [[TestView alloc] init];

    [window setContentView:view];

    [window makeKeyAndOrderFront:nil];

    [NSApp run];

    [pool release];

    return 0;
}