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ebc1da55cd
theme background image handling. desktop-image-scale-method,
desktop-image-h-align, desktop-image-v-align.
* grub-core/gfxmenu/view.c: Likewise.
* include/gfxmenu_view.h: Likewise.
* include/bitmap_scale.h: Proportional scale functions introduced.
* grub-core/video/bitmap_scale.c: Likewise. Verification checks are
put in a separate functions. GRUB_ERR_BUG is set for grub_error in
cases of unexpected input variables for scale functions.
* docs/grub.texi: Updated documentation for new options.
86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
/* bitmap_scale.h - Bitmap scaling functions. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008,2009 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_SCALE_HEADER
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#define GRUB_BITMAP_SCALE_HEADER 1
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#include <grub/err.h>
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#include <grub/types.h>
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#include <grub/bitmap_scale.h>
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enum grub_video_bitmap_scale_method
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{
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/* Choose the fastest interpolation algorithm. */
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GRUB_VIDEO_BITMAP_SCALE_METHOD_FASTEST,
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/* Choose the highest quality interpolation algorithm. */
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GRUB_VIDEO_BITMAP_SCALE_METHOD_BEST,
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/* Specific algorithms: */
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/* Nearest neighbor interpolation. */
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GRUB_VIDEO_BITMAP_SCALE_METHOD_NEAREST,
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/* Bilinear interpolation. */
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GRUB_VIDEO_BITMAP_SCALE_METHOD_BILINEAR
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};
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typedef enum grub_video_bitmap_selection_method
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{
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GRUB_VIDEO_BITMAP_SELECTION_METHOD_STRETCH,
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GRUB_VIDEO_BITMAP_SELECTION_METHOD_CROP,
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GRUB_VIDEO_BITMAP_SELECTION_METHOD_PADDING,
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GRUB_VIDEO_BITMAP_SELECTION_METHOD_FITWIDTH,
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GRUB_VIDEO_BITMAP_SELECTION_METHOD_FITHEIGHT
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} grub_video_bitmap_selection_method_t;
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typedef enum grub_video_bitmap_v_align
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{
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GRUB_VIDEO_BITMAP_V_ALIGN_TOP,
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GRUB_VIDEO_BITMAP_V_ALIGN_CENTER,
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GRUB_VIDEO_BITMAP_V_ALIGN_BOTTOM
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} grub_video_bitmap_v_align_t;
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typedef enum grub_video_bitmap_h_align
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{
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GRUB_VIDEO_BITMAP_H_ALIGN_LEFT,
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GRUB_VIDEO_BITMAP_H_ALIGN_CENTER,
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GRUB_VIDEO_BITMAP_H_ALIGN_RIGHT
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} grub_video_bitmap_h_align_t;
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grub_err_t
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EXPORT_FUNC (grub_video_bitmap_create_scaled) (struct grub_video_bitmap **dst,
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int dst_width, int dst_height,
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struct grub_video_bitmap *src,
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enum
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grub_video_bitmap_scale_method
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scale_method);
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grub_err_t
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EXPORT_FUNC (grub_video_bitmap_scale_proportional)
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(struct grub_video_bitmap **dst,
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int dst_width, int dst_height,
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struct grub_video_bitmap *src,
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enum grub_video_bitmap_scale_method
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scale_method,
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grub_video_bitmap_selection_method_t
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selection_method,
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grub_video_bitmap_v_align_t v_align,
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grub_video_bitmap_h_align_t h_align);
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#endif /* ! GRUB_BITMAP_SCALE_HEADER */
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