Attachment 6154 Details for Bug 7446 – Implementation of _cairo_quartz_surface_acquire_source_image

[patch] Implementation of _cairo_quartz_surface_acquire_source_image

acquire-source.patch (text/plain), 5.27 KB, created by Dave Vasilevsky on 2006-07-06 18:59:38 UTC

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Creator: Dave Vasilevsky

Created: 2006-07-06 18:59:38 UTC

Size: 5.27 KB

patch

obsolete

>ï»¿diff -Naur cairo-old/src/cairo-quartz-surface.c cairo-new/src/cairo-quartz-surface.c
>--- cairo-old/src/cairo-quartz-surface.c	2006-06-29 20:05:59.000000000 -0400
>+++ cairo-new/src/cairo-quartz-surface.c	2006-07-06 21:22:51.000000000 -0400
>@@ -37,6 +37,8 @@
> #include "cairo-private.h"
> #include "cairo-quartz-private.h"
> 
>+#include <AvailabilityMacros.h>
>+
> static cairo_status_t
> _cairo_quartz_surface_finish(void *abstract_surface)
> {
>@@ -48,18 +50,147 @@
>     return CAIRO_STATUS_SUCCESS;
> }
> 
>+#if (MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_4)
>+
>+/* Get the cairo format for a CGContext's data. Return true if successful,
>+ * false if no matching format known. */
>+static cairo_bool_t
>+_cairo_quartz_surface_format_for_bitmap_context(
>+			CGContextRef context,
>+			cairo_format_t *format_out)
>+{
>+	size_t bpp, bpc;
>+	CGBitmapInfo info, order;
>+	
>+	bpp = CGBitmapContextGetBitsPerPixel(context);
>+	if (bpp == 0) {
>+		return FALSE; /* Not a bitmap! */
>+	}
>+	bpc = CGBitmapContextGetBitsPerComponent(context);
>+	info = CGBitmapContextGetBitmapInfo(context);
>+	order = info & kCGBitmapByteOrderMask;
>+	
>+	if (info & kCGBitmapFloatComponents) {
>+		return FALSE;
>+	}
>+	
>+	if (bpp == 32 && order == kCGBitmapByteOrder32Host) {
>+		CGBitmapInfo alpha = info & kCGBitmapAlphaInfoMask;
>+		if (alpha == kCGImageAlphaPremultipliedFirst) {
>+			*format_out = CAIRO_FORMAT_ARGB32;
>+			return TRUE;
>+		} else if (alpha == kCGImageAlphaNoneSkipFirst) {
>+			*format_out = CAIRO_FORMAT_RGB24;
>+			return TRUE;
>+		}
>+	} else if (bpp == 8 && bpc == 8) {
>+		*format_out = CAIRO_FORMAT_A8;
>+		return TRUE;
>+	}
>+	return FALSE;
>+}
>+
>+/* Given a CGBitmapContext, return a bitmap context with the same contents,
>+ * whose data is appropriate for conversion to a cairo surface.
>+ * The caller is responsible for freeing the new context. */
>+static CGContextRef
>+_cairo_quartz_surface_convert_bitmap(
>+			CGContextRef context)
>+{
>+	CGImageRef image;
>+	CGColorSpaceRef color_space;
>+	CGContextRef new_context;
>+	CGRect rect;
>+	size_t height, width;
>+	void *data;
>+	
>+	/* Make a new context */
>+	color_space = CGColorSpaceCreateDeviceRGB();
>+	height = CGBitmapContextGetHeight(context);
>+	width = CGBitmapContextGetWidth(context);
>+	rect = CGRectMake(0.0, 0.0, width, height);
>+	data = malloc(4 * height * width);
>+	new_context = CGBitmapContextCreate(data, width, height, 8, width * 4,
>+		color_space,
>+		kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host);
>+	CGContextClearRect(new_context, rect);
>+	
>+	/* Turn the old one into an image, and draw the image to the new context */
>+	image = CGBitmapContextCreateImage(context);
>+	CGContextDrawImage(new_context, rect, image);
>+	CGImageRelease(image);
>+	return new_context;
>+}
>+
>+static cairo_status_t
>+_cairo_quartz_surface_acquire_source_image(
>+			void *abstract_surface,
>+			cairo_image_surface_t **image_out,
>+			void **image_extra)
>+{
>+	CGContextRef context, source;
>+	cairo_format_t format;
>+	cairo_image_surface_t *image;
>+	void *data;
>+	
>+	/* Support weak linking */
>+	if (CGBitmapContextGetBitmapInfo == NULL)
>+		return CAIRO_INT_STATUS_UNSUPPORTED;
>+		
>+	context = ((cairo_quartz_surface_t *)abstract_surface)->context;
>+	
>+	/* We can only use bitmap contexts as sources */
>+	if (CGBitmapContextGetBitsPerPixel(context) == 0)
>+		return CAIRO_INT_STATUS_UNSUPPORTED; /* not a bitmap */
>+	
>+	/* Find a format, and what bitmap to use as the data source */
>+	if (_cairo_quartz_surface_format_for_bitmap_context(context, &format)) {
>+		source = context;
>+		*image_extra = NULL;
>+	} else {
>+		source = _cairo_quartz_surface_convert_bitmap(context);
>+		*image_extra = source;
>+		_cairo_quartz_surface_format_for_bitmap_context(source, &format);
>+	}
>+	
>+	/* Make a cairo surface from the data */
>+	data = CGBitmapContextGetData(source);
>+	image = (cairo_image_surface_t*)cairo_image_surface_create_for_data(
>+		data, format,
>+		CGBitmapContextGetWidth(source),
>+		CGBitmapContextGetHeight(source),
>+		CGBitmapContextGetBytesPerRow(source));
>+	*image_out = image;
>+	
>+	return CAIRO_STATUS_SUCCESS;
>+}
>+
>+#else /* < MAC_OS_X_VERSION_10_4 */
>+
> static cairo_status_t
>-_cairo_quartz_surface_acquire_source_image(void *abstract_surface,
>-					   cairo_image_surface_t **image_out,
>-					   void **image_extra)
>+_cairo_quartz_surface_acquire_source_image(
>+			void *abstract_surface,
>+			cairo_image_surface_t **image_out,
>+			void **image_extra)
> {
>-  cairo_quartz_surface_t *surface = abstract_surface;
>+	return CAIRO_INT_STATUS_UNSUPPORTED;
>+}
>+
>+#endif
> 
>-  if (CGBitmapContextGetBitmapInfo (surface->context) != 0) {
>-    /* XXX: We can create an image out of the bitmap here */
>-  }
> 
>-  return CAIRO_INT_STATUS_UNSUPPORTED;
>+static void
>+_cairo_quartz_surface_release_source_image (
>+			void *abstract_surface,
>+			cairo_image_surface_t  *image,
>+			void *image_extra)
>+{
>+	cairo_surface_destroy((cairo_surface_t *)image);
>+	if (image_extra != NULL) {
>+		CGContextRef bitmap = (CGContextRef)image_extra;
>+		free(CGBitmapContextGetData(bitmap));
>+		CGContextRelease(bitmap);
>+	}
> }
> 
> static cairo_status_t
>@@ -210,7 +341,7 @@
>     NULL, /* create_similar */
>     _cairo_quartz_surface_finish,
>     _cairo_quartz_surface_acquire_source_image,
>-    NULL, /* release_source_image */
>+    _cairo_quartz_surface_release_source_image,
>     _cairo_quartz_surface_acquire_dest_image,
>     _cairo_quartz_surface_release_dest_image,
>     NULL, /* clone_similar */

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