107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_BITMAP_HEADER
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#define GRUB_BITMAP_HEADER 1
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#include <grub/err.h>
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#include <grub/symbol.h>
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#include <grub/types.h>
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#include <grub/video.h>
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#include <grub/safemath.h>
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#define IMAGE_HW_MAX_PX 16384
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struct grub_video_bitmap
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{
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/* Bitmap format description. */
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struct grub_video_mode_info mode_info;
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/* Pointer to bitmap data formatted according to mode_info. */
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void *data;
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};
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struct grub_video_bitmap_reader
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{
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/* File extension for this bitmap type (including dot). */
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const char *extension;
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/* Reader function to load bitmap. */
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grub_err_t (*reader) (struct grub_video_bitmap **bitmap,
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const char *filename);
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/* Next reader. */
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struct grub_video_bitmap_reader *next;
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};
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typedef struct grub_video_bitmap_reader *grub_video_bitmap_reader_t;
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void EXPORT_FUNC (grub_video_bitmap_reader_register) (grub_video_bitmap_reader_t reader);
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void EXPORT_FUNC (grub_video_bitmap_reader_unregister) (grub_video_bitmap_reader_t reader);
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grub_err_t EXPORT_FUNC (grub_video_bitmap_create) (struct grub_video_bitmap **bitmap,
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unsigned int width, unsigned int height,
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enum grub_video_blit_format blit_format);
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grub_err_t EXPORT_FUNC (grub_video_bitmap_destroy) (struct grub_video_bitmap *bitmap);
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grub_err_t EXPORT_FUNC (grub_video_bitmap_load) (struct grub_video_bitmap **bitmap,
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const char *filename);
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/* Return bitmap width. */
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static inline unsigned int
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grub_video_bitmap_get_width (struct grub_video_bitmap *bitmap)
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{
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if (!bitmap)
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return 0;
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return bitmap->mode_info.width;
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}
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/* Return bitmap height. */
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static inline unsigned int
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grub_video_bitmap_get_height (struct grub_video_bitmap *bitmap)
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{
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if (!bitmap)
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return 0;
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return bitmap->mode_info.height;
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}
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/*
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* Calculate and store the size of data buffer of 1bit bitmap in result.
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* Equivalent to "*result = (width * height + 7) / 8" if no overflow occurs.
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* Return true when overflow occurs or false if there is no overflow.
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* This function is intentionally implemented as a macro instead of
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* an inline function. Although a bit awkward, it preserves data types for
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* safemath macros and reduces macro side effects as much as possible.
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*
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* XXX: Will report false overflow if width * height > UINT64_MAX.
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*/
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#define grub_video_bitmap_calc_1bpp_bufsz(width, height, result) \
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({ \
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grub_uint64_t _bitmap_pixels; \
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grub_mul ((width), (height), &_bitmap_pixels) ? 1 : \
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grub_cast (_bitmap_pixels / GRUB_CHAR_BIT + !!(_bitmap_pixels % GRUB_CHAR_BIT), (result)); \
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})
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void EXPORT_FUNC (grub_video_bitmap_get_mode_info) (struct grub_video_bitmap *bitmap,
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struct grub_video_mode_info *mode_info);
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void *EXPORT_FUNC (grub_video_bitmap_get_data) (struct grub_video_bitmap *bitmap);
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#endif /* ! GRUB_BITMAP_HEADER */
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