netsurf/frontends/atari/bitmap.h

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/*
* 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/>.
*/
/**
* \file
* Atari bitmap handling implementation.
*/
#ifndef NS_ATARI_BITMAP_H
#define NS_ATARI_BITMAP_H
#include <gem.h>
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#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,
*
* \param bpp Bits per pixel.
* \param stride Word aligned rowstride (width) as returned by MFDB_STRIDE,
* \param h Height in pixels.
*/
#define MFDB_SIZE( bpp, stride, h ) ( ((stride >> 3) * h) * bpp )
struct gui_bitmap_table *atari_bitmap_table;
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;
};
/**
* 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).
*
* \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 );
/**
* Create a bitmap.
*
* \param w width of image in pixels
* \param h 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 *atari_bitmap_create(int w, int h, unsigned int state);
/**
* 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 atari_bitmap_get_rowstride(void *bitmap);
/**
* Free a bitmap.
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
void atari_bitmap_destroy(void *bitmap);
/**
* Get bitmap width
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
int atari_bitmap_get_width(void *bitmap);
/**
* Get bitmap height
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
int atari_bitmap_get_height(void *bitmap);
/**
* Gets whether a bitmap should be plotted opaque
*
* \param bitmap a bitmap, as returned by bitmap_create()
*/
bool atari_bitmap_get_opaque(void *bitmap);
size_t atari_bitmap_buffer_size(void *bitmap);
bool atari_bitmap_resize(struct bitmap *img, HermesHandle hermes_h, HermesFormat *fmt, int nw, int nh);
void *atari_bitmap_realloc( int w, int h, short bpp, int rowstride, unsigned int state, void * bmp );
#endif