netsurf/gtk/gtk_bitmap.c

/*
 * This file is part of NetSurf, http://netsurf.sourceforge.net/
 * Licensed under the GNU General Public License,
 *                http://www.opensource.org/licenses/gpl-license
 * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
 */

/** \file
 * Generic bitmap handling (GDK / GTK+ implementation).
 *
 * This implements the interface given by desktop/bitmap.h using GdkPixbufs.
 */

#include <assert.h>
#include <stdbool.h>
#include <string.h>
#include <gdk/gdk.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "netsurf/content/content.h"
#include "netsurf/gtk/gtk_window.h"
#include "netsurf/image/bitmap.h"


struct bitmap;


/**
 * Create a bitmap.
 *
 * \param  width   width of image in pixels
 * \param  height  width of image in pixels
 * \param  state   a flag word indicating the initial state
 * \return an opaque struct bitmap, or NULL on memory exhaustion
 */

struct bitmap *bitmap_create(int width, int height, unsigned int state)
{
	GdkPixbuf *pixbuf = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8,
			width, height);
	return (struct bitmap *) pixbuf;
}


/**
 * Sets whether a bitmap should be plotted opaque
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 * \param  opaque  whether the bitmap should be plotted opaque
 */
void bitmap_set_opaque(struct bitmap *bitmap, bool opaque)
{
	assert(bitmap);
/* todo: set bitmap as opaque */
}


/**
 * Tests whether a bitmap has an opaque alpha channel
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 * \return whether the bitmap is opaque
 */
bool bitmap_test_opaque(struct bitmap *bitmap)
{
	assert(bitmap);
/* todo: test if bitmap as opaque */
	return false;
}


/**
 * Gets whether a bitmap should be plotted opaque
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
bool bitmap_get_opaque(struct bitmap *bitmap)
{
	assert(bitmap);
/* todo: get whether bitmap is opaque */
	return false;
}


/**
 * Return a pointer to the pixel data in a bitmap.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 * \return pointer to the pixel buffer
 *
 * The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end
 * of rows. The width of a row in bytes is given by bitmap_get_rowstride().
 */

char *bitmap_get_buffer(struct bitmap *bitmap)
{
	assert(bitmap);
	return (char *)gdk_pixbuf_get_pixels((GdkPixbuf *) bitmap);
}


/**
 * Find the width of a pixel row in bytes.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 * \return width of a pixel row in the bitmap
 */

size_t bitmap_get_rowstride(struct bitmap *bitmap)
{
	assert(bitmap);
	return gdk_pixbuf_get_rowstride((GdkPixbuf *) bitmap);
}


/**
 * Free a bitmap.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */

void bitmap_destroy(struct bitmap *bitmap)
{
	assert(bitmap);
	g_object_unref((GdkPixbuf *) bitmap);
}


/**
 * Save a bitmap in the platform's native format.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 * \param  path    pathname for file
 * \return true on success, false on error and error reported
 */

bool bitmap_save(struct bitmap *bitmap, const char *path)
{
	return true;
}


/**
 * The bitmap image has changed, so flush any persistant cache.
 *
 * \param  bitmap  a bitmap, as returned by bitmap_create()
 */
void bitmap_modified(struct bitmap *bitmap) {
}


/**
 * The bitmap image can be suspended.
 *
 * \param  bitmap  	a bitmap, as returned by bitmap_create()
 * \param  private_word	a private word to be returned later
 * \param  suspend	the function to be called upon suspension
 * \param  resume	the function to be called when resuming
 */
void bitmap_set_suspendable(struct bitmap *bitmap, void *private_word,
		void (*invalidate)(struct bitmap *bitmap, void *private_word)) {
}