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Diffstat (limited to 'desktop/bitmap.h')
| -rw-r--r-- | desktop/bitmap.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/desktop/bitmap.h b/desktop/bitmap.h new file mode 100644 index 000000000..51ce2c908 --- /dev/null +++ b/desktop/bitmap.h @@ -0,0 +1,147 @@ +/* + * Copyright 2022 Michael Drake <tlsa@nesturf-browser.org> + * + * 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 + * Internal core bitmap interface. + */ + +#ifndef _NETSURF_DESKTOP_BITMAP_H_ +#define _NETSURF_DESKTOP_BITMAP_H_ + +#include <nsutils/endian.h> + +#include "netsurf/types.h" +#include "netsurf/bitmap.h" + +/** Pixel format: colour component order. */ +struct bitmap_colour_layout { + uint8_t r; /**< Byte offset within pixel to red component. */ + uint8_t g; /**< Byte offset within pixel to green component. */ + uint8_t b; /**< Byte offset within pixel to blue component. */ + uint8_t a; /**< Byte offset within pixel to alpha component. */ +}; + +/** The client bitmap format. */ +extern bitmap_fmt_t bitmap_fmt; + +/** The client bitmap colour channel layout. */ +extern struct bitmap_colour_layout bitmap_layout; + +/** + * Convert a bitmap pixel to a NetSurf colour (0xAARRGGBB). + * + * The bitmap must be in the client format. + * + * \param[in] Pointer to a pixel in the bitmap's pixel data. + * \return The corresponding NetSurf colour. + */ +static inline colour bitmap_pixel_to_colour(const uint8_t *pixel) +{ + return (pixel[bitmap_layout.r] << 0) | + (pixel[bitmap_layout.g] << 8) | + (pixel[bitmap_layout.b] << 16) | + (pixel[bitmap_layout.a] << 24); +} + +/** + * Sanitise bitmap pixel component layout. + * + * Map endian-dependant layouts to byte-wise layout for the host. + * + * \param[in] layout Layout to convert. + * \return sanitised layout. + */ +static inline enum bitmap_layout bitmap_sanitise_bitmap_layout( + enum bitmap_layout layout) +{ + bool le = endian_host_is_le(); + + switch (layout) { + case BITMAP_LAYOUT_RGBA8888: + layout = (le) ? BITMAP_LAYOUT_A8B8G8R8 + : BITMAP_LAYOUT_R8G8B8A8; + break; + case BITMAP_LAYOUT_BGRA8888: + layout = (le) ? BITMAP_LAYOUT_A8R8G8B8 + : BITMAP_LAYOUT_B8G8R8A8; + break; + case BITMAP_LAYOUT_ARGB8888: + layout = (le) ? BITMAP_LAYOUT_B8G8R8A8 + : BITMAP_LAYOUT_A8R8G8B8; + break; + case BITMAP_LAYOUT_ABGR8888: + layout = (le) ? BITMAP_LAYOUT_R8G8B8A8 + : BITMAP_LAYOUT_A8B8G8R8; + break; + default: + break; + } + + return layout; +} + +/** + * Convert bitmap from one format to another. + * + * Note that both formats should be sanitised. + * + * \param[in] bitmap The bitmap to convert. + * \param[in] from The current bitmap format specifier. + * \param[in] to The bitmap format to convert to. + */ +void bitmap_format_convert(void *bitmap, + const bitmap_fmt_t *from, + const bitmap_fmt_t *to); + +/** + * Convert a bitmap to the client bitmap format. + * + * \param[in] bitmap The bitmap to convert. + * \param[in] current_fmt The current bitmap format specifier. + */ +static inline void bitmap_format_to_client( + void *bitmap, + const bitmap_fmt_t *current_fmt) +{ + bitmap_fmt_t from = *current_fmt; + + from.layout = bitmap_sanitise_bitmap_layout(from.layout); + if (from.layout != bitmap_fmt.layout || from.pma != bitmap_fmt.pma) { + bitmap_format_convert(bitmap, &from, &bitmap_fmt); + } +} + +/** + * Convert a bitmap to the client bitmap format. + * + * \param[in] bitmap The bitmap to convert. + * \param[in] target_fmt The target bitmap format specifier. + */ +static inline void bitmap_format_from_client( + void *bitmap, + const bitmap_fmt_t *target_fmt) +{ + bitmap_fmt_t to = *target_fmt; + + to.layout = bitmap_sanitise_bitmap_layout(to.layout); + if (to.layout != bitmap_fmt.layout || to.pma != bitmap_fmt.pma) { + bitmap_format_convert(bitmap, &bitmap_fmt, &to); + } +} + +#endif |