/*
* Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <inttypes.h>
#include <sys/types.h>
#include <stdbool.h>
#include <assert.h>
#include <libnsfb.h>
#include "image/bitmap.h"
#include "utils/log.h"
/**
* 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
*/
void *bitmap_create(int width, int height, unsigned int state)
{
nsfb_t *bm;
LOG(("width %d, height %d, state %u",width,height,state));
bm = nsfb_new(NSFB_SURFACE_RAM);
if (bm == NULL) {
return NULL;
}
if ((state & BITMAP_OPAQUE) == 0) {
nsfb_set_geometry(bm, width, height, NSFB_FMT_ABGR8888);
} else {
nsfb_set_geometry(bm, width, height, NSFB_FMT_XBGR8888);
}
if (nsfb_init(bm) == -1) {
nsfb_free(bm);
return NULL;
}
LOG(("bitmap %p", bm));
return bm;
}
/**
* 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().
*/
unsigned char *bitmap_get_buffer(void *bitmap)
{
nsfb_t *bm = bitmap;
unsigned char *bmpptr;
nsfb_get_buffer(bm, &bmpptr, NULL);
return bmpptr;
}
/**
* 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(void *bitmap)
{
nsfb_t *bm = bitmap;
int bmpstride;
nsfb_get_buffer(bm, NULL, &bmpstride);
return bmpstride;
}
/**
* Free a bitmap.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_destroy(void *bitmap)
{
nsfb_t *bm = bitmap;
nsfb_free(bm);
}
/**
* 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(void *bitmap, const char *path, unsigned flags)
{
return true;
}
/**
* The bitmap image has changed, so flush any persistant cache.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void bitmap_modified(void *bitmap) {
}
/**
* Sets wether 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(void *bitmap, bool opaque)
{
nsfb_t *bm = bitmap;
LOG(("setting bitmap %p to %s", bm, opaque?"opaque":"transparent"));
if (opaque) {
nsfb_set_geometry(bm, 0, 0, NSFB_FMT_XBGR8888);
} else {
nsfb_set_geometry(bm, 0, 0, NSFB_FMT_ABGR8888);
}
}
/**
* 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(void *bitmap)
{
int tst;
nsfb_t *bm = bitmap;
unsigned char *bmpptr;
int width;
int height;
nsfb_get_buffer(bm, &bmpptr, NULL);
nsfb_get_geometry(bm, &width, &height, NULL);
tst = width * height;
while (tst-- > 0) {
if (bmpptr[(tst << 2) + 3] != 0xff) {
LOG(("bitmap %p has transparency",bm));
return false;
}
}
LOG(("bitmap %p is opaque", bm));
return true;
}
/**
* Gets weather a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
bool bitmap_get_opaque(void *bitmap)
{
nsfb_t *bm = bitmap;
enum nsfb_format_e format;
nsfb_get_geometry(bm, NULL, NULL, &format);
if (format == NSFB_FMT_ABGR8888)
return false;
return true;
}
int bitmap_get_width(void *bitmap)
{
nsfb_t *bm = bitmap;
int width;
nsfb_get_geometry(bm, &width, NULL, NULL);
return(width);
}
int bitmap_get_height(void *bitmap)
{
nsfb_t *bm = bitmap;
int height;
nsfb_get_geometry(bm, NULL, &height, NULL);
return(height);
}
/* get bytes per pixel */
size_t bitmap_get_bpp(void *bitmap)
{
return 4;
}
/*
* Local Variables:
* c-basic-offset:8
* End:
*/