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/*-
* Copyright 2021 Vsevolod Stakhov
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef RSPAMD_HTML_BLOCK_HXX
#define RSPAMD_HTML_BLOCK_HXX
#pragma once
#include "libserver/css/css_value.hxx"
#include <cmath>
namespace rspamd::html {
/*
* Block tag definition
*/
struct html_block {
rspamd::css::css_color fg_color;
rspamd::css::css_color bg_color;
std::int16_t height;
std::int16_t width;
std::uint16_t mask;
rspamd::css::css_display_value display;
std::int8_t font_size;
constexpr static const auto fg_color_mask = 0x1 << 0;
constexpr static const auto bg_color_mask = 0x1 << 1;
constexpr static const auto height_mask = 0x1 << 2;
constexpr static const auto width_mask = 0x1 << 3;
constexpr static const auto display_mask = 0x1 << 4;
constexpr static const auto font_size_mask = 0x1 << 5;
constexpr static const auto invisible_flag = 0x1 << 6;
constexpr static const auto transparent_flag = 0x1 << 7;
/* Helpers to set mask when setting the elements */
auto set_fgcolor(const rspamd::css::css_color &c) -> void {
fg_color = c;
mask |= fg_color_mask;
}
auto set_bgcolor(const rspamd::css::css_color &c) -> void {
bg_color = c;
mask |= bg_color_mask;
}
auto set_height(float h, bool is_percent = false) -> void {
h = is_percent ? (-h) : h;
if (h < INT16_MIN) {
/* Negative numbers encode percents... */
height = -100;
}
else if (h > INT16_MAX) {
height = INT16_MAX;
}
else {
height = h;
}
mask |= height_mask;
}
auto set_width(float w, bool is_percent = false) -> void {
w = is_percent ? (-w) : w;
if (w < INT16_MIN) {
width = INT16_MIN;
}
else if (w > INT16_MAX) {
width = INT16_MAX;
}
else {
width = w;
}
mask |= width_mask;
}
auto set_display(bool v) -> void {
if (v) {
display = rspamd::css::css_display_value::DISPLAY_INLINE;
}
else {
display = rspamd::css::css_display_value::DISPLAY_HIDDEN;
}
mask |= display_mask;
}
auto set_display(rspamd::css::css_display_value v) -> void {
display = v;
mask |= display_mask;
}
auto set_font_size(float fs, bool is_percent = false) -> void {
fs = is_percent ? (-fs) : fs;
if (fs < INT8_MIN) {
font_size = -100;
}
else if (fs > INT8_MAX) {
font_size = INT8_MAX;
}
else {
font_size = fs;
}
mask |= font_size_mask;
}
/**
* Propagate values from the block if they are not defined by the current block
* @param other
* @return
*/
auto propagate_block(const html_block &other) -> void {
auto simple_prop = [&](auto mask_val, auto &our_val, auto other_val) constexpr -> void {
if (!(mask & mask_val) && (other.mask & mask_val)) {
our_val = other_val;
mask |= mask_val;
}
};
simple_prop(fg_color_mask, fg_color, other.fg_color);
simple_prop(bg_color_mask, bg_color, other.bg_color);
if (other.has_display() && !other.is_visible()) {
simple_prop(display_mask, display, other.display);
mask |= other.mask&(transparent_flag|invisible_flag);
}
/* Sizes are very different
* We can have multiple cases:
* 1) Our size is > 0 and we can use it as is
* 2) Parent size is > 0 and our size is undefined, so propagate parent
* 3) Parent size is < 0 and our size is undefined - propagate parent
* 4) Parent size is > 0 and our size is < 0 - multiply parent by abs(ours)
* 5) Parent size is undefined and our size is < 0 - tricky stuff, assume some defaults
*/
auto size_prop = [&](auto mask_val, auto &our_val, auto other_val, auto default_val) constexpr -> void {
if ((mask & mask_val)) {
/* We have our value */
if (our_val < 0) {
if (other.mask & mask_val) {
if (other_val >= 0) {
our_val = other_val * (-our_val / 100.0);
}
else {
our_val *= (-other_val / 100.0);
}
}
else {
/* Parent value is not defined and our value is relative */
our_val = default_val * (-our_val / 100.0);
}
}
/* We do nothing as we have our own absolute value */
}
else {
/* We propagate parent if defined */
if (other.mask & mask_val) {
our_val = other_val;
mask |= mask_val;
}
/* Otherwise do nothing */
}
};
size_prop(height_mask, height, other.height, 800);
size_prop(width_mask, width, other.width, 1024);
size_prop(font_size_mask, font_size, other.font_size, 1024);
}
auto compute_visibility(void) -> void {
if (mask & display_mask) {
if (display == css::css_display_value::DISPLAY_HIDDEN) {
mask |= invisible_flag;
return;
}
}
if (mask & font_size_mask) {
if (font_size == 0) {
mask |= invisible_flag;
return;
}
}
auto is_similar_colors = [](const rspamd::css::css_color &fg, const rspamd::css::css_color &bg) -> bool {
constexpr const auto min_visible_diff = 0.1f;
auto diff_r = ((float)fg.r - bg.r);
auto diff_g = ((float)fg.g - bg.g);
auto diff_b = ((float)fg.b - bg.b);
auto ravg = (fg.r + bg.r) / 2.0f;
/* Square diffs */
diff_r *= diff_r;
diff_g *= diff_g;
diff_b *= diff_b;
auto diff = std::sqrt(2.0f * diff_r + 4.0f * diff_g + 3.0f * diff_b +
(ravg * (diff_r - diff_b) / 256.0f)) / 256.0f;
return diff < min_visible_diff;
};
/* Check if we have both bg/fg colors */
if ((mask & (bg_color_mask|fg_color_mask)) == (bg_color_mask|fg_color_mask)) {
if (fg_color.alpha < 10) {
/* Too transparent */
mask |= invisible_flag|transparent_flag;
return;
}
if (bg_color.alpha > 10) {
if (is_similar_colors(fg_color, bg_color)) {
mask |= invisible_flag|transparent_flag;
return;
}
}
}
else if (mask & fg_color_mask) {
/* Merely fg color */
if (fg_color.alpha < 10) {
/* Too transparent */
mask |= invisible_flag|transparent_flag;
return;
}
/* Implicit fg color */
if (is_similar_colors(fg_color, rspamd::css::css_color::white())) {
mask |= invisible_flag|transparent_flag;
return;
}
}
else if (mask & bg_color_mask) {
if (is_similar_colors(rspamd::css::css_color::black(), bg_color)) {
mask |= invisible_flag|transparent_flag;
return;
}
}
mask &= ~(invisible_flag|transparent_flag);
}
constexpr auto is_visible(void) const -> bool {
return (mask & invisible_flag) == 0;
}
constexpr auto is_transparent(void) const -> bool {
return (mask & transparent_flag) != 0;
}
constexpr auto has_display(void) const -> bool {
return (mask & display_mask) != 0;
}
/**
* Returns a default html block for root HTML element
* @return
*/
static auto default_html_block(void) -> html_block {
return html_block{rspamd::css::css_color::black(),
rspamd::css::css_color::white(),
0, 0,
(fg_color_mask|bg_color_mask|font_size_mask),
rspamd::css::css_display_value::DISPLAY_INLINE,
12};
}
/**
* Produces html block with no defined values allocated from the pool
* @param pool
* @return
*/
static auto undefined_html_block_pool(rspamd_mempool_t *pool) -> html_block* {
auto *bl = rspamd_mempool_alloc_type(pool, html_block);
bl->mask = 0;
return bl;
}
};
}
#endif //RSPAMD_HTML_BLOCK_HXX
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