netsurf/atari/bitmap.h

83 lines
2.5 KiB
C
Executable File

/*
* Copyright 2010 Ole Loots <ole@monochrom.net>
*
* 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/>.
*/
#ifndef NS_ATARI_BITMAP_H
#define NS_ATARI_BITMAP_H
#include <gem.h>
#include <Hermes/Hermes.h>
#define NS_BMP_DEFAULT_BPP 4
/* Flags for init_mfdb function: */
#define MFDB_FLAG_STAND 0x01
#define MFDB_FLAG_ZEROMEM 0x02
#define MFDB_FLAG_NOALLOC 0x04
#define BITMAP_SHRINK 0
#define BITMAP_GROW 1024 /* Don't realloc when bitmap size shrinks */
#define BITMAP_CLEAR 2048 /* Zero bitmap memory */
/*
calculates MFDB compatible rowstride (in number of bits)
*/
#define MFDB_STRIDE( w ) (((w & 15) != 0) ? (w | 15)+1 : w)
/*
Calculate size of an mfdb,
params:
bpp: Bits per pixel,
stride: Word aligned rowstride (width) as returned by MFDB_STRIDE,
h: Height in pixels
*/
#define MFDB_SIZE( bpp, stride, h ) ( ((stride >> 3) * h) * bpp )
struct bitmap {
int width;
int height;
uint8_t *pixdata;
bool opaque;
short bpp; /* number of BYTES! per pixel */
size_t rowstride;
struct bitmap * resized;
MFDB native;
bool converted;
};
void * bitmap_create_ex( int w, int h, short bpp, int rowstride, unsigned int state, void * pixdata );
void bitmap_to_mfdb(void * bitmap, MFDB * out);
void * bitmap_realloc( int w, int h, short bpp, int rowstride, unsigned int state, void * bmp );
size_t bitmap_buffer_size( void * bitmap ) ;
bool bitmap_resize(struct bitmap * img, HermesHandle hermes_h,
HermesFormat *fmt, int nw, int nh);
/*
setup an MFDB struct and allocate memory for it when it is needed.
If bpp == 0, this function assumes that the MFDB shall point to the screen
and will not allocate any memory (mfdb.fd_addr == 0).
The function will return 0 when the memory allocation fails
( out of memory), otherwise it returns the size of the mfdb.fd_addr
as number of bytes.
*/
int init_mfdb(int bpp, int w, int h, uint32_t flags, MFDB * out );
#endif