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148 lines
4.0 KiB
148 lines
4.0 KiB
/*
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* Copyright 2022 Michael Drake <tlsa@nesturf-browser.org>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf 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; version 2 of the License.
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*
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* NetSurf 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 this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** \file
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* Internal core bitmap interface.
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*/
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#ifndef _NETSURF_DESKTOP_BITMAP_H_
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#define _NETSURF_DESKTOP_BITMAP_H_
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#include <nsutils/endian.h>
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#include "netsurf/types.h"
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#include "netsurf/bitmap.h"
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/** Pixel format: colour component order. */
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struct bitmap_colour_layout {
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uint8_t r; /**< Byte offset within pixel to red component. */
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uint8_t g; /**< Byte offset within pixel to green component. */
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uint8_t b; /**< Byte offset within pixel to blue component. */
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uint8_t a; /**< Byte offset within pixel to alpha component. */
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};
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/** The client bitmap format. */
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extern bitmap_fmt_t bitmap_fmt;
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/** The client bitmap colour channel layout. */
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extern struct bitmap_colour_layout bitmap_layout;
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/**
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* Convert a bitmap pixel to a NetSurf colour (0xAARRGGBB).
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*
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* The bitmap must be in the client format.
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*
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* \param[in] Pointer to a pixel in the bitmap's pixel data.
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* \return The corresponding NetSurf colour.
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*/
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static inline colour bitmap_pixel_to_colour(const uint8_t *pixel)
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{
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return (pixel[bitmap_layout.r] << 0) |
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(pixel[bitmap_layout.g] << 8) |
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(pixel[bitmap_layout.b] << 16) |
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(pixel[bitmap_layout.a] << 24);
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}
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/**
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* Sanitise bitmap pixel component layout.
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*
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* Map endian-dependant layouts to byte-wise layout for the host.
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*
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* \param[in] layout Layout to convert.
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* \return sanitised layout.
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*/
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static inline enum bitmap_layout bitmap_sanitise_bitmap_layout(
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enum bitmap_layout layout)
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{
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bool le = endian_host_is_le();
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switch (layout) {
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case BITMAP_LAYOUT_RGBA8888:
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layout = (le) ? BITMAP_LAYOUT_A8B8G8R8
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: BITMAP_LAYOUT_R8G8B8A8;
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break;
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case BITMAP_LAYOUT_BGRA8888:
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layout = (le) ? BITMAP_LAYOUT_A8R8G8B8
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: BITMAP_LAYOUT_B8G8R8A8;
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break;
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case BITMAP_LAYOUT_ARGB8888:
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layout = (le) ? BITMAP_LAYOUT_B8G8R8A8
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: BITMAP_LAYOUT_A8R8G8B8;
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break;
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case BITMAP_LAYOUT_ABGR8888:
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layout = (le) ? BITMAP_LAYOUT_R8G8B8A8
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: BITMAP_LAYOUT_A8B8G8R8;
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break;
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default:
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break;
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}
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return layout;
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}
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/**
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* Convert bitmap from one format to another.
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*
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* Note that both formats should be sanitised.
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*
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* \param[in] bitmap The bitmap to convert.
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* \param[in] from The current bitmap format specifier.
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* \param[in] to The bitmap format to convert to.
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*/
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void bitmap_format_convert(void *bitmap,
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const bitmap_fmt_t *from,
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const bitmap_fmt_t *to);
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/**
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* Convert a bitmap to the client bitmap format.
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*
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* \param[in] bitmap The bitmap to convert.
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* \param[in] current_fmt The current bitmap format specifier.
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*/
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static inline void bitmap_format_to_client(
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void *bitmap,
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const bitmap_fmt_t *current_fmt)
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{
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bitmap_fmt_t from = *current_fmt;
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from.layout = bitmap_sanitise_bitmap_layout(from.layout);
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if (from.layout != bitmap_fmt.layout || from.pma != bitmap_fmt.pma) {
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bitmap_format_convert(bitmap, &from, &bitmap_fmt);
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}
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}
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/**
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* Convert a bitmap to the client bitmap format.
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*
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* \param[in] bitmap The bitmap to convert.
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* \param[in] target_fmt The target bitmap format specifier.
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*/
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static inline void bitmap_format_from_client(
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void *bitmap,
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const bitmap_fmt_t *target_fmt)
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{
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bitmap_fmt_t to = *target_fmt;
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to.layout = bitmap_sanitise_bitmap_layout(to.layout);
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if (to.layout != bitmap_fmt.layout || to.pma != bitmap_fmt.pma) {
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bitmap_format_convert(bitmap, &bitmap_fmt, &to);
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}
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}
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#endif
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