293 lines
8.9 KiB
C
293 lines
8.9 KiB
C
/*
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* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
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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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/**
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* \file
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* plotter style interfaces, generic styles and style colour helpers.
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*/
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#ifndef NETSURF_PLOT_STYLE_H
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#define NETSURF_PLOT_STYLE_H
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#include <stdint.h>
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#include <stdint.h>
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#include <libwapcaplet/libwapcaplet.h>
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#include "netsurf/types.h"
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/** light grey widget base colour */
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#define WIDGET_BASEC 0xd9d9d9
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/** black blob colour */
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#define WIDGET_BLOBC 0x000000
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/** Transparent colour value. */
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#define NS_TRANSPARENT 0x01000000
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/** 22:10 fixed point */
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#define PLOT_STYLE_RADIX (10)
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/** Scaling factor for plot styles */
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#define PLOT_STYLE_SCALE (1 << PLOT_STYLE_RADIX)
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/* type for fixed point numbers */
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typedef int32_t plot_style_fixed;
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/* Convert an int to fixed point */
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#define plot_style_int_to_fixed(v) ((v) << PLOT_STYLE_RADIX)
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/* Convert fixed point to int */
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#define plot_style_fixed_to_int(v) ((v) >> PLOT_STYLE_RADIX)
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/* Convert fixed point to float */
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#define plot_style_fixed_to_float(v) (((float)v) / PLOT_STYLE_SCALE)
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/* Convert fixed point to double */
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#define plot_style_fixed_to_double(v) (((double)v) / PLOT_STYLE_SCALE)
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/**
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* Type of plot operation
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*/
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typedef enum {
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PLOT_OP_TYPE_NONE = 0, /**< No operation */
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PLOT_OP_TYPE_SOLID, /**< Solid colour */
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PLOT_OP_TYPE_DOT, /**< Dotted plot */
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PLOT_OP_TYPE_DASH, /**< Dashed plot */
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} plot_operation_type_t;
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/**
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* Plot style for stroke/fill plotters
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*/
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typedef struct plot_style_s {
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plot_operation_type_t stroke_type; /**< Stroke plot type */
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plot_style_fixed stroke_width; /**< Width of stroke, in pixels */
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colour stroke_colour; /**< Colour of stroke */
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plot_operation_type_t fill_type; /**< Fill plot type */
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colour fill_colour; /**< Colour of fill */
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} plot_style_t;
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/**
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* Generic font family type
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*/
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typedef enum {
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PLOT_FONT_FAMILY_SANS_SERIF = 0,
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PLOT_FONT_FAMILY_SERIF,
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PLOT_FONT_FAMILY_MONOSPACE,
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PLOT_FONT_FAMILY_CURSIVE,
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PLOT_FONT_FAMILY_FANTASY,
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PLOT_FONT_FAMILY_COUNT /**< Number of generic families */
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} plot_font_generic_family_t;
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/**
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* Font plot flags
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*/
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typedef enum {
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FONTF_NONE = 0,
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FONTF_ITALIC = 1,
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FONTF_OBLIQUE = 2,
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FONTF_SMALLCAPS = 4,
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} plot_font_flags_t;
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/**
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* Font style for plotting
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*/
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typedef struct plot_font_style {
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/**
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* Array of pointers to font families.
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*
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* May be NULL. Array is NULL terminated.
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*/
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lwc_string * const * families;
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plot_font_generic_family_t family; /**< Generic family to plot with */
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plot_style_fixed size; /**< Font size, in pt */
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int weight; /**< Font weight: value in range [100,900] as per CSS */
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plot_font_flags_t flags; /**< Font flags */
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colour background; /**< Background colour to blend to, if appropriate */
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colour foreground; /**< Colour of text */
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} plot_font_style_t;
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/* Darken a colour by taking seven eighths of each channel's intensity */
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#define half_darken_colour(c1) \
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((((7 * (c1 & 0xff00ff)) >> 3) & 0xff00ff) | \
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(((7 * (c1 & 0x00ff00)) >> 3) & 0x00ff00))
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/* Darken a colour by taking three quarters of each channel's intensity */
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#define darken_colour(c1) \
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((((3 * (c1 & 0xff00ff)) >> 2) & 0xff00ff) | \
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(((3 * (c1 & 0x00ff00)) >> 2) & 0x00ff00))
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/* Darken a colour by taking nine sixteenths of each channel's intensity */
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#define double_darken_colour(c1) \
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((((9 * (c1 & 0xff00ff)) >> 4) & 0xff00ff) | \
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(((9 * (c1 & 0x00ff00)) >> 4) & 0x00ff00))
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/* Lighten a colour by taking seven eighths of each channel's intensity
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* and adding a full one eighth intensity */
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#define half_lighten_colour(c1) \
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(((((7 * (c1 & 0xff00ff)) >> 3) + 0x200020) & 0xff00ff) | \
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((((7 * (c1 & 0x00ff00)) >> 3) + 0x002000) & 0x00ff00))
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/* Lighten a colour by taking 12/16ths of each channel's intensity
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* and adding a full 4/16ths intensity */
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#define lighten_colour(c1) \
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(((((3 * (c1 & 0xff00ff)) >> 2) + 0x400040) & 0xff00ff) | \
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((((3 * (c1 & 0x00ff00)) >> 2) + 0x004000) & 0x00ff00))
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/* Lighten a colour by taking 9/16ths of each channel's intensity
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* and adding a full 7/16ths intensity */
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#define double_lighten_colour(c1) \
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(((((9 * (c1 & 0xff00ff)) >> 4) + 0x700070) & 0xff00ff) | \
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((((9 * (c1 & 0x00ff00)) >> 4) + 0x007000) & 0x00ff00))
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/* Blend two colours by taking half the intensity of each channel in the first
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* colour and adding them to half the intensity of each channel in the second
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* colour */
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#define blend_colour(c0, c1) \
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(((((c0 & 0xff00ff) + (c1 & 0xff00ff)) >> 1) & 0xff00ff) | \
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((((c0 & 0x00ff00) + (c1 & 0x00ff00)) >> 1) & 0x00ff00))
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/**
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* Obtain the luminance of a colour according to ITU BT.601
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*
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* ITU BT.601 formula is
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* Y = 0.299 R + 0.587 G + 0.114 B
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* actual values are
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* Y = 76/255 R + 150/255 G + 29/255 B
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* Y = 0.298 R + 0.588 G + 0.113 B
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*
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* @note if additional performance is required this could be altered to
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* Y = 0.375 R + 0.5 G + 0.125 B
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* with
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* Y = (R << 1 + R + G << 2 + B) >> 3
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*/
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#define colour_lightness(c0) \
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((((c0 & 0x0000ff) * 77) >> 8) + \
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(((c0 & 0x00ff00) * 151) >> 16) + \
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(((c0 & 0xff0000) * 30) >> 24))
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/* Choose either black or white, depending on which is nearest to the
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* percieved lightness of the supplied colour, c0. */
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#define colour_to_bw_nearest(c0) \
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((colour_lightness(c0) > (0xff / 2)) ? 0xffffff : 0x000000)
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/* Choose either black or white, depending on which is furthest from the
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* percieved lightness of the supplied colour, c0. */
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#define colour_to_bw_furthest(c0) \
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((colour_lightness(c0) > (0xff / 2)) ? 0x000000 : 0xffffff)
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/* Mix two colours according to the proportion given by p, where 0 <= p <= 255
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* p = 0 gives result ==> c1, p = 255 gives result ==> c0 */
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#define mix_colour(c0, c1, p) \
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((((((c1 & 0xff00ff) * (255 - p)) + \
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((c0 & 0xff00ff) * ( p)) ) >> 8) & 0xff00ff) | \
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(((((c1 & 0x00ff00) * (255 - p)) + \
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((c0 & 0x00ff00) * ( p)) ) >> 8) & 0x00ff00))
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/* get a bitmap pixel (image/bitmap.h) into a plot colour */
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#define pixel_to_colour(b) \
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b[0] | (b[1] << 8) | (b[2] << 16) | (b[3] << 24)
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/* Get the red channel from a colour */
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#define red_from_colour(c) \
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((c ) & 0xff)
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/* Get the green channel from a colour */
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#define green_from_colour(c) \
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((c >> 8) & 0xff)
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/* Get the blue channel from a colour */
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#define blue_from_colour(c) \
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((c >> 16) & 0xff)
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/* Swap red and blue channels in a colour */
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#define colour_rb_swap(c) \
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(((0x000000ff & c) << 16) | \
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((0x0000ff00 & c) ) | \
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((0x00ff0000 & c) >> 16))
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/** Colour components */
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enum plot_colour_component {
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PLOT_COLOUR_COMPONENT_RED,
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PLOT_COLOUR_COMPONENT_GREEN,
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PLOT_COLOUR_COMPONENT_BLUE,
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PLOT_COLOUR_COMPONENT_ALPHA,
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};
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/**
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* Engorge a particular colour channel.
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*
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* \param[in] col The colour to engorge a component of.
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* \param[in] dark Whether col is a dark colour.
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* \param[in] comp Colour component to engorge.
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*/
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static inline colour colour_engorge_component(
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colour col,
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bool dark,
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enum plot_colour_component comp)
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{
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static const colour msk[PLOT_COLOUR_COMPONENT_ALPHA] = {
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[PLOT_COLOUR_COMPONENT_RED] = 0x0000ff,
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[PLOT_COLOUR_COMPONENT_GREEN] = 0x00ff00,
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[PLOT_COLOUR_COMPONENT_BLUE] = 0xff0000,
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};
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colour d = dark ? darken_colour(col) : double_darken_colour(col);
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colour l = dark ? double_lighten_colour(col) : lighten_colour(col);
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assert(comp < PLOT_COLOUR_COMPONENT_ALPHA);
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return (msk[comp] & l) | (~msk[comp] & d);
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}
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/* global fill styles */
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extern plot_style_t *plot_style_fill_white;
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extern plot_style_t *plot_style_fill_red;
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extern plot_style_t *plot_style_fill_black;
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/* Box model debug outline styles for content, padding and margin edges */
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extern plot_style_t const * const plot_style_content_edge;
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extern plot_style_t const * const plot_style_padding_edge;
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extern plot_style_t const * const plot_style_margin_edge;
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/* Broken object replacement styles */
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extern plot_style_t const * const plot_style_broken_object;
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extern plot_font_style_t const * const plot_fstyle_broken_object;
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/* other styles */
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extern plot_style_t *plot_style_caret;
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extern plot_style_t *plot_style_fill_wbasec;
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extern plot_style_t *plot_style_fill_darkwbasec;
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extern plot_style_t *plot_style_fill_lightwbasec;
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extern plot_style_t *plot_style_fill_wblobc;
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extern plot_style_t *plot_style_stroke_wblobc;
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extern plot_style_t *plot_style_stroke_darkwbasec;
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extern plot_style_t *plot_style_stroke_lightwbasec;
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/* Default font style */
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extern plot_font_style_t const * const plot_style_font;
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#endif
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