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Diffstat (limited to 'frontends/atari/bitmap.h')
-rw-r--r-- | frontends/atari/bitmap.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/frontends/atari/bitmap.h b/frontends/atari/bitmap.h new file mode 100644 index 000000000..b0fa18069 --- /dev/null +++ b/frontends/atari/bitmap.h @@ -0,0 +1,137 @@ +/* + * 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> +#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 |