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Painter.cpp
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Painter.cpp
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/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2022, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Painter.h"
#include "Bitmap.h"
#include "Font/Emoji.h"
#include "Font/Font.h"
#include <AK/Assertions.h>
#include <AK/Debug.h>
#include <AK/Function.h>
#include <AK/Math.h>
#include <AK/Memory.h>
#include <AK/Queue.h>
#include <AK/QuickSort.h>
#include <AK/Stack.h>
#include <AK/StdLibExtras.h>
#include <AK/StringBuilder.h>
#include <AK/Utf32View.h>
#include <AK/Utf8View.h>
#include <LibGfx/CharacterBitmap.h>
#include <LibGfx/Palette.h>
#include <LibGfx/Path.h>
#include <LibGfx/Quad.h>
#include <LibGfx/TextDirection.h>
#include <LibGfx/TextLayout.h>
#include <LibUnicode/CharacterTypes.h>
#include <LibUnicode/Emoji.h>
#include <stdio.h>
#if defined(AK_COMPILER_GCC)
# pragma GCC optimize("O3")
#endif
namespace Gfx {
template<BitmapFormat format = BitmapFormat::Invalid>
ALWAYS_INLINE Color get_pixel(Gfx::Bitmap const& bitmap, int x, int y)
{
if constexpr (format == BitmapFormat::BGRx8888)
return Color::from_rgb(bitmap.scanline(y)[x]);
if constexpr (format == BitmapFormat::BGRA8888)
return Color::from_argb(bitmap.scanline(y)[x]);
return bitmap.get_pixel(x, y);
}
Painter::Painter(Gfx::Bitmap& bitmap)
: m_target(bitmap)
{
int scale = bitmap.scale();
VERIFY(bitmap.format() == Gfx::BitmapFormat::BGRx8888 || bitmap.format() == Gfx::BitmapFormat::BGRA8888);
VERIFY(bitmap.physical_width() % scale == 0);
VERIFY(bitmap.physical_height() % scale == 0);
m_state_stack.append(State());
state().font = nullptr;
state().clip_rect = { { 0, 0 }, bitmap.size() };
state().scale = scale;
m_clip_origin = state().clip_rect;
}
void Painter::fill_rect_with_draw_op(IntRect const& a_rect, Color color)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
for (int i = rect.height() - 1; i >= 0; --i) {
for (int j = 0; j < rect.width(); ++j)
set_physical_pixel_with_draw_op(dst[j], color);
dst += dst_skip;
}
}
void Painter::clear_rect(IntRect const& a_rect, Color color)
{
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
VERIFY(m_target->rect().contains(rect));
rect *= scale();
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
for (int i = rect.height() - 1; i >= 0; --i) {
fast_u32_fill(dst, color.value(), rect.width());
dst += dst_skip;
}
}
void Painter::fill_physical_rect(IntRect const& physical_rect, Color color)
{
// Callers must do clipping.
ARGB32* dst = m_target->scanline(physical_rect.top()) + physical_rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
auto dst_format = target()->format();
for (int i = physical_rect.height() - 1; i >= 0; --i) {
for (int j = 0; j < physical_rect.width(); ++j)
dst[j] = color_for_format(dst_format, dst[j]).blend(color).value();
dst += dst_skip;
}
}
void Painter::fill_rect(IntRect const& a_rect, Color color)
{
if (color.alpha() == 0)
return;
if (draw_op() != DrawOp::Copy) {
fill_rect_with_draw_op(a_rect, color);
return;
}
if (color.alpha() == 0xff) {
clear_rect(a_rect, color);
return;
}
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
VERIFY(m_target->rect().contains(rect));
fill_physical_rect(rect * scale(), color);
}
void Painter::fill_rect(IntRect const& rect, PaintStyle const& paint_style)
{
auto a_rect = rect.translated(translation());
auto clipped_rect = a_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
a_rect *= scale();
clipped_rect *= scale();
auto start_offset = clipped_rect.location() - a_rect.location();
paint_style.paint(a_rect, [&](PaintStyle::SamplerFunction sample) {
for (int y = 0; y < clipped_rect.height(); ++y) {
for (int x = 0; x < clipped_rect.width(); ++x) {
IntPoint point(x, y);
set_physical_pixel(point + clipped_rect.location(), sample(point + start_offset), true);
}
}
});
}
void Painter::fill_rect_with_dither_pattern(IntRect const& a_rect, Color color_a, Color color_b)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
for (int i = 0; i < rect.height(); ++i) {
for (int j = 0; j < rect.width(); ++j) {
bool checkboard_use_a = ((rect.left() + i) & 1) ^ ((rect.top() + j) & 1);
if (checkboard_use_a && !color_a.alpha())
continue;
if (!checkboard_use_a && !color_b.alpha())
continue;
dst[j] = checkboard_use_a ? color_a.value() : color_b.value();
}
dst += dst_skip;
}
}
void Painter::fill_rect_with_checkerboard(IntRect const& a_rect, IntSize cell_size, Color color_dark, Color color_light)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
auto translated_rect = a_rect.translated(translation());
auto rect = translated_rect.intersected(clip_rect());
if (rect.is_empty())
return;
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
int first_cell_column = (rect.x() - translated_rect.x()) / cell_size.width();
int prologue_length = min(rect.width(), cell_size.width() - ((rect.x() - translated_rect.x()) % cell_size.width()));
int number_of_aligned_strips = (rect.width() - prologue_length) / cell_size.width();
for (int i = 0; i < rect.height(); ++i) {
int y = rect.y() - translated_rect.y() + i;
int cell_row = y / cell_size.height();
bool odd_row = cell_row & 1;
// Prologue: Paint the unaligned part up to the first intersection.
int j = 0;
int cell_column = first_cell_column;
{
bool odd_cell = cell_column & 1;
auto color = (odd_row ^ odd_cell) ? color_light.value() : color_dark.value();
fast_u32_fill(&dst[j], color, prologue_length);
j += prologue_length;
}
// Aligned run: Paint the maximum number of aligned cell strips.
for (int strip = 0; strip < number_of_aligned_strips; ++strip) {
++cell_column;
bool odd_cell = cell_column & 1;
auto color = (odd_row ^ odd_cell) ? color_light.value() : color_dark.value();
fast_u32_fill(&dst[j], color, cell_size.width());
j += cell_size.width();
}
// Epilogue: Paint the unaligned part until the end of the rect.
if (j != rect.width()) {
++cell_column;
bool odd_cell = cell_column & 1;
auto color = (odd_row ^ odd_cell) ? color_light.value() : color_dark.value();
int epilogue_length = rect.width() - j;
fast_u32_fill(&dst[j], color, epilogue_length);
j += epilogue_length;
}
dst += dst_skip;
}
}
void Painter::fill_rect_with_gradient(Orientation orientation, IntRect const& a_rect, Color gradient_start, Color gradient_end)
{
if (gradient_start == gradient_end) {
fill_rect(a_rect, gradient_start);
return;
}
return fill_rect_with_linear_gradient(a_rect, Array { ColorStop { gradient_start, 0 }, ColorStop { gradient_end, 1 } }, orientation == Orientation::Horizontal ? 90.0f : 0.0f);
}
void Painter::fill_rect_with_gradient(IntRect const& a_rect, Color gradient_start, Color gradient_end)
{
return fill_rect_with_gradient(Orientation::Horizontal, a_rect, gradient_start, gradient_end);
}
void Painter::fill_rect_with_rounded_corners(IntRect const& a_rect, Color color, int radius)
{
return fill_rect_with_rounded_corners(a_rect, color, radius, radius, radius, radius);
}
void Painter::fill_rect_with_rounded_corners(IntRect const& a_rect, Color color, int top_left_radius, int top_right_radius, int bottom_right_radius, int bottom_left_radius)
{
// Fasttrack for rects without any border radii
if (!top_left_radius && !top_right_radius && !bottom_right_radius && !bottom_left_radius)
return fill_rect(a_rect, color);
// Fully transparent, dont care.
if (color.alpha() == 0)
return;
// FIXME: Allow for elliptically rounded corners
IntRect top_left_corner = {
a_rect.x(),
a_rect.y(),
top_left_radius,
top_left_radius
};
IntRect top_right_corner = {
a_rect.x() + a_rect.width() - top_right_radius,
a_rect.y(),
top_right_radius,
top_right_radius
};
IntRect bottom_right_corner = {
a_rect.x() + a_rect.width() - bottom_right_radius,
a_rect.y() + a_rect.height() - bottom_right_radius,
bottom_right_radius,
bottom_right_radius
};
IntRect bottom_left_corner = {
a_rect.x(),
a_rect.y() + a_rect.height() - bottom_left_radius,
bottom_left_radius,
bottom_left_radius
};
IntRect top_rect = {
a_rect.x() + top_left_radius,
a_rect.y(),
a_rect.width() - top_left_radius - top_right_radius, top_left_radius
};
IntRect right_rect = {
a_rect.x() + a_rect.width() - top_right_radius,
a_rect.y() + top_right_radius,
top_right_radius,
a_rect.height() - top_right_radius - bottom_right_radius
};
IntRect bottom_rect = {
a_rect.x() + bottom_left_radius,
a_rect.y() + a_rect.height() - bottom_right_radius,
a_rect.width() - bottom_left_radius - bottom_right_radius,
bottom_right_radius
};
IntRect left_rect = {
a_rect.x(),
a_rect.y() + top_left_radius,
bottom_left_radius,
a_rect.height() - top_left_radius - bottom_left_radius
};
IntRect inner = {
left_rect.x() + left_rect.width(),
left_rect.y(),
a_rect.width() - left_rect.width() - right_rect.width(),
a_rect.height() - top_rect.height() - bottom_rect.height()
};
fill_rect(top_rect, color);
fill_rect(right_rect, color);
fill_rect(bottom_rect, color);
fill_rect(left_rect, color);
fill_rect(inner, color);
if (top_left_radius)
fill_rounded_corner(top_left_corner, top_left_radius, color, CornerOrientation::TopLeft);
if (top_right_radius)
fill_rounded_corner(top_right_corner, top_right_radius, color, CornerOrientation::TopRight);
if (bottom_left_radius)
fill_rounded_corner(bottom_left_corner, bottom_left_radius, color, CornerOrientation::BottomLeft);
if (bottom_right_radius)
fill_rounded_corner(bottom_right_corner, bottom_right_radius, color, CornerOrientation::BottomRight);
}
void Painter::fill_rounded_corner(IntRect const& a_rect, int radius, Color color, CornerOrientation orientation)
{
// Care about clipping
auto translated_a_rect = a_rect.translated(translation());
auto rect = translated_a_rect.intersected(clip_rect());
if (rect.is_empty())
return;
VERIFY(m_target->rect().contains(rect));
// We got cut on the top!
// FIXME: Also account for clipping on the x-axis
int clip_offset = 0;
if (translated_a_rect.y() < rect.y())
clip_offset = rect.y() - translated_a_rect.y();
radius *= scale();
rect *= scale();
clip_offset *= scale();
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
IntPoint circle_center;
switch (orientation) {
case CornerOrientation::TopLeft:
circle_center = { radius, radius + 1 };
break;
case CornerOrientation::TopRight:
circle_center = { -1, radius + 1 };
break;
case CornerOrientation::BottomRight:
circle_center = { -1, 0 };
break;
case CornerOrientation::BottomLeft:
circle_center = { radius, 0 };
break;
default:
VERIFY_NOT_REACHED();
}
int radius2 = radius * radius;
auto is_in_circle = [&](int x, int y) {
int distance2 = (circle_center.x() - x) * (circle_center.x() - x) + (circle_center.y() - y) * (circle_center.y() - y);
// To reflect the grid and be compatible with the draw_circle_arc_intersecting algorithm
// add 1/2 to the radius
return distance2 <= (radius2 + radius + 0.25);
};
auto dst_format = target()->format();
for (int i = rect.height() - 1; i >= 0; --i) {
for (int j = 0; j < rect.width(); ++j)
if (is_in_circle(j, rect.height() - i + clip_offset))
dst[j] = color_for_format(dst_format, dst[j]).blend(color).value();
dst += dst_skip;
}
}
void Painter::draw_circle_arc_intersecting(IntRect const& a_rect, IntPoint center, int radius, Color color, int thickness)
{
if (thickness <= 0 || radius <= 0)
return;
// Care about clipping
auto translated_a_rect = a_rect.translated(translation());
auto rect = translated_a_rect.intersected(clip_rect());
if (rect.is_empty())
return;
VERIFY(m_target->rect().contains(rect));
// We got cut on the top!
// FIXME: Also account for clipping on the x-axis
int clip_offset = 0;
if (translated_a_rect.y() < rect.y())
clip_offset = rect.y() - translated_a_rect.y();
if (thickness > radius)
thickness = radius;
int radius2 = radius * radius;
auto is_on_arc = [&](int x, int y) {
int distance2 = (center.x() - x) * (center.x() - x) + (center.y() - y) * (center.y() - y);
// Is within a circle of radius 1/2 around (x,y), so basically within the current pixel.
// Technically this is angle-dependent and should be between 1/2 and sqrt(2)/2, but this works.
return distance2 <= (radius2 + radius + 0.25) && distance2 >= (radius2 - radius + 0.25);
};
ARGB32* dst = m_target->scanline(rect.top()) + rect.left();
auto dst_format = target()->format();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
for (int i = rect.height() - 1; i >= 0; --i) {
for (int j = 0; j < rect.width(); ++j)
if (is_on_arc(j, rect.height() - i + clip_offset))
dst[j] = color_for_format(dst_format, dst[j]).blend(color).value();
dst += dst_skip;
}
return draw_circle_arc_intersecting(a_rect, center, radius - 1, color, thickness - 1);
}
// The callback will only be called for a quarter of the ellipse, the user is intended to deduce other points.
// As the coordinate space is relative to the center of the rectangle, it's simply (x, y), (x, -y), (-x, y) and (-x, -y).
static void on_each_ellipse_point(IntRect const& rect, Function<void(IntPoint)>&& callback)
{
// Note: This is an implementation of the Midpoint Ellipse Algorithm.
double const a = rect.width() / 2;
double const a_square = a * a;
double const b = rect.height() / 2;
double const b_square = b * b;
int x = 0;
auto y = static_cast<int>(b);
double dx = 2 * b_square * x;
double dy = 2 * a_square * y;
// For region 1:
auto decision_parameter = b_square - a_square * b + .25 * a_square;
while (dx < dy) {
callback({ x, y });
if (decision_parameter >= 0) {
y--;
dy -= 2 * a_square;
decision_parameter -= dy;
}
x++;
dx += 2 * b_square;
decision_parameter += dx + b_square;
}
// For region 2:
decision_parameter = b_square * ((x + 0.5) * (x + 0.5)) + a_square * ((y - 1) * (y - 1)) - a_square * b_square;
while (y >= 0) {
callback({ x, y });
if (decision_parameter <= 0) {
x++;
dx += 2 * b_square;
decision_parameter += dx;
}
y--;
dy -= 2 * a_square;
decision_parameter += a_square - dy;
}
}
void Painter::fill_ellipse(IntRect const& a_rect, Color color)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
auto rect = a_rect.translated(translation()).intersected(clip_rect());
if (rect.is_empty())
return;
VERIFY(m_target->rect().contains(rect));
auto const center = a_rect.center();
on_each_ellipse_point(rect, [this, &color, center](IntPoint position) {
IntPoint const directions[4] = { { position.x(), position.y() }, { -position.x(), position.y() }, { position.x(), -position.y() }, { -position.x(), -position.y() } };
draw_line(center + directions[0], center + directions[1], color);
draw_line(center + directions[2], center + directions[3], color);
});
}
void Painter::draw_ellipse_intersecting(IntRect const& rect, Color color, int thickness)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
if (thickness <= 0)
return;
auto const center = rect.center();
on_each_ellipse_point(rect, [this, &color, thickness, center](IntPoint position) {
IntPoint const directions[4] = { { position.x(), position.y() }, { position.x(), -position.y() }, { -position.x(), position.y() }, { -position.x(), -position.y() } };
for (auto const delta : directions) {
auto const point = center + delta;
draw_line(point, point, color, thickness);
}
});
}
template<typename RectType, typename Callback>
static void for_each_pixel_around_rect_clockwise(RectType const& rect, Callback callback)
{
if (rect.is_empty())
return;
for (auto x = rect.left(); x < rect.right(); ++x)
callback(x, rect.top());
for (auto y = rect.top() + 1; y < rect.bottom(); ++y)
callback(rect.right() - 1, y);
for (auto x = rect.right() - 2; x >= rect.left(); --x)
callback(x, rect.bottom() - 1);
for (auto y = rect.bottom() - 2; y > rect.top(); --y)
callback(rect.left(), y);
}
void Painter::draw_focus_rect(IntRect const& rect, Color color)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
if (rect.is_empty())
return;
bool state = false;
for_each_pixel_around_rect_clockwise(rect, [&](auto x, auto y) {
if (state)
set_pixel(x, y, color);
state = !state;
});
}
void Painter::draw_rect(IntRect const& a_rect, Color color, bool rough)
{
IntRect rect = a_rect.translated(translation());
auto clipped_rect = rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int min_y = clipped_rect.top();
int max_y = clipped_rect.bottom() - 1;
int scale = this->scale();
if (rect.top() >= clipped_rect.top() && rect.top() < clipped_rect.bottom()) {
int width = rough ? max(0, min(rect.width() - 2, clipped_rect.width())) : clipped_rect.width();
if (width > 0) {
int start_x = rough ? max(rect.x() + 1, clipped_rect.x()) : clipped_rect.x();
for (int i = 0; i < scale; ++i)
fill_physical_scanline_with_draw_op(rect.top() * scale + i, start_x * scale, width * scale, color);
}
++min_y;
}
if (rect.bottom() > clipped_rect.top() && rect.bottom() <= clipped_rect.bottom()) {
int width = rough ? max(0, min(rect.width() - 2, clipped_rect.width())) : clipped_rect.width();
if (width > 0) {
int start_x = rough ? max(rect.x() + 1, clipped_rect.x()) : clipped_rect.x();
for (int i = 0; i < scale; ++i)
fill_physical_scanline_with_draw_op(max_y * scale + i, start_x * scale, width * scale, color);
}
--max_y;
}
bool draw_left_side = rect.left() >= clipped_rect.left();
bool draw_right_side = rect.right() == clipped_rect.right();
if (draw_left_side && draw_right_side) {
// Specialized loop when drawing both sides.
for (int y = min_y * scale; y <= max_y * scale; ++y) {
auto* bits = m_target->scanline(y);
for (int i = 0; i < scale; ++i)
set_physical_pixel_with_draw_op(bits[rect.left() * scale + i], color);
for (int i = 0; i < scale; ++i)
set_physical_pixel_with_draw_op(bits[(rect.right() - 1) * scale + i], color);
}
} else {
for (int y = min_y * scale; y <= max_y * scale; ++y) {
auto* bits = m_target->scanline(y);
if (draw_left_side)
for (int i = 0; i < scale; ++i)
set_physical_pixel_with_draw_op(bits[rect.left() * scale + i], color);
if (draw_right_side)
for (int i = 0; i < scale; ++i)
set_physical_pixel_with_draw_op(bits[(rect.right() - 1) * scale + i], color);
}
}
}
void Painter::draw_rect_with_thickness(IntRect const& rect, Color color, int thickness)
{
if (thickness <= 0)
return;
IntPoint p1 = rect.location();
IntPoint p2 = { rect.location().x() + rect.width(), rect.location().y() };
IntPoint p3 = { rect.location().x() + rect.width(), rect.location().y() + rect.height() };
IntPoint p4 = { rect.location().x(), rect.location().y() + rect.height() };
draw_line(p1, p2, color, thickness);
draw_line(p2, p3, color, thickness);
draw_line(p3, p4, color, thickness);
draw_line(p4, p1, color, thickness);
}
void Painter::draw_bitmap(IntPoint p, CharacterBitmap const& bitmap, Color color)
{
VERIFY(scale() == 1); // FIXME: Add scaling support.
auto rect = IntRect(p, bitmap.size()).translated(translation());
auto clipped_rect = rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int const first_row = clipped_rect.top() - rect.top();
int const last_row = clipped_rect.bottom() - rect.top();
int const first_column = clipped_rect.left() - rect.left();
int const last_column = clipped_rect.right() - rect.left();
ARGB32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
char const* bitmap_row = &bitmap.bits()[first_row * bitmap.width() + first_column];
size_t const bitmap_skip = bitmap.width();
for (int row = first_row; row < last_row; ++row) {
for (int j = 0; j < (last_column - first_column); ++j) {
char fc = bitmap_row[j];
if (fc == '#')
dst[j] = color.value();
}
bitmap_row += bitmap_skip;
dst += dst_skip;
}
}
void Painter::draw_bitmap(IntPoint p, GlyphBitmap const& bitmap, Color color)
{
auto dst_rect = IntRect(p, bitmap.size()).translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int const first_row = clipped_rect.top() - dst_rect.top();
int const last_row = clipped_rect.bottom() - dst_rect.top();
int const first_column = clipped_rect.left() - dst_rect.left();
int const last_column = clipped_rect.right() - dst_rect.left();
int scale = this->scale();
ARGB32* dst = m_target->scanline(clipped_rect.y() * scale) + clipped_rect.x() * scale;
auto dst_format = target()->format();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
if (scale == 1) {
for (int row = first_row; row < last_row; ++row) {
for (int j = 0; j < (last_column - first_column); ++j) {
if (bitmap.bit_at(j + first_column, row))
dst[j] = color_for_format(dst_format, dst[j]).blend(color).value();
}
dst += dst_skip;
}
} else {
for (int row = first_row; row < last_row; ++row) {
for (int j = 0; j < (last_column - first_column); ++j) {
if (bitmap.bit_at((j + first_column), row)) {
for (int iy = 0; iy < scale; ++iy)
for (int ix = 0; ix < scale; ++ix) {
auto pixel_index = j * scale + ix + iy * dst_skip;
dst[pixel_index] = color_for_format(dst_format, dst[pixel_index]).blend(color).value();
}
}
}
dst += dst_skip * scale;
}
}
}
void Painter::draw_triangle(IntPoint offset, ReadonlySpan<IntPoint> control_points, Color color)
{
VERIFY(control_points.size() == 3);
draw_triangle(control_points[0] + offset, control_points[1] + offset, control_points[2] + offset, color);
}
void Painter::draw_triangle(IntPoint a, IntPoint b, IntPoint c, Color color)
{
IntPoint p0(to_physical(a));
IntPoint p1(to_physical(b));
IntPoint p2(to_physical(c));
// sort points from top to bottom
if (p0.y() > p1.y())
swap(p0, p1);
if (p0.y() > p2.y())
swap(p0, p2);
if (p1.y() > p2.y())
swap(p1, p2);
// return if top and bottom points are on same line
if (p0.y() == p2.y())
return;
// return if all points are on the same line vertically
if (p0.x() == p1.x() && p1.x() == p2.x())
return;
// return if top is below clip rect or bottom is above clip rect
auto clip = clip_rect();
if (p0.y() >= clip.bottom() - 1)
return;
if (p2.y() < clip.top())
return;
class BoundaryLine {
private:
IntPoint m_base {};
IntPoint m_path {};
public:
BoundaryLine(IntPoint a, IntPoint b)
{
VERIFY(a.y() <= b.y());
m_base = a;
m_path = b - a;
}
int top_y() const { return m_base.y(); }
int bottom_y() const { return m_base.y() + m_path.y(); }
bool is_vertical() const { return m_path.x() == 0; }
bool is_horizontal() const { return m_path.y() == 0; }
bool in_y_range(int y) const { return y >= top_y() && y <= bottom_y(); }
Optional<int> intersection_on_x(int y) const
{
if (!in_y_range(y))
return {};
if (is_horizontal())
return {};
if (is_vertical())
return m_base.x();
int y_diff = y - top_y();
int x_d = m_path.x() * y_diff, y_d = m_path.y();
return (x_d / y_d) + m_base.x();
}
};
BoundaryLine l0(p0, p1), l1(p0, p2), l2(p1, p2);
int rgba = color.value();
for (int y = max(p0.y(), clip.top()); y < min(p2.y() + 1, clip.bottom()); y++) {
Optional<int>
x0 = l0.intersection_on_x(y),
x1 = l1.intersection_on_x(y),
x2 = l2.intersection_on_x(y);
int result_a = 0, result_b = 0;
if (x0.has_value()) {
result_a = x0.value();
if (x1.has_value() && ((!x2.has_value()) || (result_a != x1.value()))) {
result_b = x1.value();
} else {
result_b = x2.value();
}
} else if (x1.has_value()) {
result_a = x1.value();
result_b = x2.value();
}
if (result_a > result_b)
swap(result_a, result_b);
int left_bound = result_a, right_bound = result_b;
ARGB32* scanline = m_target->scanline(y);
for (int x = max(left_bound, clip.left()); x <= min(right_bound, clip.right() - 1); x++)
scanline[x] = rgba;
}
}
struct BlitState {
enum AlphaState {
NoAlpha = 0,
SrcAlpha = 1,
DstAlpha = 2,
BothAlpha = SrcAlpha | DstAlpha
};
ARGB32 const* src;
ARGB32* dst;
size_t src_pitch;
size_t dst_pitch;
int row_count;
int column_count;
float opacity;
BitmapFormat src_format;
};
// FIXME: This is a hack to support blit_with_opacity() with RGBA8888 source.
// Ideally we'd have a more generic solution that allows any source format.
static void swap_red_and_blue_channels(Color& color)
{
u32 rgba = color.value();
u32 bgra = (rgba & 0xff00ff00)
| ((rgba & 0x000000ff) << 16)
| ((rgba & 0x00ff0000) >> 16);
color = Color::from_argb(bgra);
}
// FIXME: This function is very unoptimized.
template<BlitState::AlphaState has_alpha>
static void do_blit_with_opacity(BlitState& state)
{
for (int row = 0; row < state.row_count; ++row) {
for (int x = 0; x < state.column_count; ++x) {
Color dest_color = (has_alpha & BlitState::DstAlpha) ? Color::from_argb(state.dst[x]) : Color::from_rgb(state.dst[x]);
if constexpr (has_alpha & BlitState::SrcAlpha) {
Color src_color_with_alpha = Color::from_argb(state.src[x]);
if (state.src_format == BitmapFormat::RGBA8888)
swap_red_and_blue_channels(src_color_with_alpha);
float pixel_opacity = src_color_with_alpha.alpha() / 255.0;
src_color_with_alpha.set_alpha(255 * (state.opacity * pixel_opacity));
state.dst[x] = dest_color.blend(src_color_with_alpha).value();
} else {
Color src_color_with_alpha = Color::from_rgb(state.src[x]);
if (state.src_format == BitmapFormat::RGBA8888)
swap_red_and_blue_channels(src_color_with_alpha);
src_color_with_alpha.set_alpha(state.opacity * 255);
state.dst[x] = dest_color.blend(src_color_with_alpha).value();
}
}
state.dst += state.dst_pitch;
state.src += state.src_pitch;
}
}
void Painter::blit_with_opacity(IntPoint position, Gfx::Bitmap const& source, IntRect const& a_src_rect, float opacity, bool apply_alpha)
{
VERIFY(scale() >= source.scale() && "painter doesn't support downsampling scale factors");
if (opacity >= 1.0f && !(source.has_alpha_channel() && apply_alpha))
return blit(position, source, a_src_rect);
IntRect safe_src_rect = IntRect::intersection(a_src_rect, source.rect());
if (scale() != source.scale())
return draw_scaled_bitmap({ position, safe_src_rect.size() }, source, safe_src_rect, opacity);
auto dst_rect = IntRect(position, safe_src_rect.size()).translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int scale = this->scale();
auto src_rect = a_src_rect * scale;
clipped_rect *= scale;
dst_rect *= scale;
int const first_row = clipped_rect.top() - dst_rect.top();
int const last_row = clipped_rect.bottom() - dst_rect.top();
int const first_column = clipped_rect.left() - dst_rect.left();
int const last_column = clipped_rect.right() - dst_rect.left();
BlitState blit_state {
.src = source.scanline(src_rect.top() + first_row) + src_rect.left() + first_column,
.dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x(),
.src_pitch = source.pitch() / sizeof(ARGB32),
.dst_pitch = m_target->pitch() / sizeof(ARGB32),
.row_count = last_row - first_row,
.column_count = last_column - first_column,
.opacity = opacity,
.src_format = source.format(),
};
if (source.has_alpha_channel() && apply_alpha) {
if (m_target->has_alpha_channel())
do_blit_with_opacity<BlitState::BothAlpha>(blit_state);
else
do_blit_with_opacity<BlitState::SrcAlpha>(blit_state);
} else {
if (m_target->has_alpha_channel())
do_blit_with_opacity<BlitState::DstAlpha>(blit_state);
else
do_blit_with_opacity<BlitState::NoAlpha>(blit_state);
}
}
void Painter::blit_filtered(IntPoint position, Gfx::Bitmap const& source, IntRect const& src_rect, Function<Color(Color)> const& filter, bool apply_alpha)
{
VERIFY((source.scale() == 1 || source.scale() == scale()) && "blit_filtered only supports integer upsampling");
IntRect safe_src_rect = src_rect.intersected(source.rect());
auto dst_rect = IntRect(position, safe_src_rect.size()).translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int scale = this->scale();
clipped_rect *= scale;
dst_rect *= scale;
safe_src_rect *= source.scale();
int const first_row = clipped_rect.top() - dst_rect.top();
int const last_row = clipped_rect.bottom() - dst_rect.top();
int const first_column = clipped_rect.left() - dst_rect.left();
int const last_column = clipped_rect.right() - dst_rect.left();
ARGB32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
size_t const dst_skip = m_target->pitch() / sizeof(ARGB32);
auto dst_format = target()->format();
auto src_format = source.format();
int s = scale / source.scale();
if (s == 1) {
ARGB32 const* src = source.scanline(safe_src_rect.top() + first_row) + safe_src_rect.left() + first_column;
size_t const src_skip = source.pitch() / sizeof(ARGB32);
for (int row = first_row; row < last_row; ++row) {
for (int x = 0; x < (last_column - first_column); ++x) {
auto source_color = color_for_format(src_format, src[x]);
if (source_color.alpha() == 0)
continue;
auto filtered_color = filter(source_color);
if (!apply_alpha || filtered_color.alpha() == 0xff)
dst[x] = filtered_color.value();
else
dst[x] = color_for_format(dst_format, dst[x]).blend(filtered_color).value();
}
dst += dst_skip;
src += src_skip;
}
} else {
for (int row = first_row; row < last_row; ++row) {
ARGB32 const* src = source.scanline(safe_src_rect.top() + row / s) + safe_src_rect.left() + first_column / s;
for (int x = 0; x < (last_column - first_column); ++x) {
auto source_color = color_for_format(src_format, src[x / s]);
if (source_color.alpha() == 0)
continue;
auto filtered_color = filter(source_color);
if (!apply_alpha || filtered_color.alpha() == 0xff)
dst[x] = filtered_color.value();
else
dst[x] = color_for_format(dst_format, dst[x]).blend(filtered_color).value();
}
dst += dst_skip;
}
}
}
void Painter::blit_brightened(IntPoint position, Gfx::Bitmap const& source, IntRect const& src_rect)
{
return blit_filtered(position, source, src_rect, [](Color src) {
return src.lightened();
});
}
void Painter::blit_dimmed(IntPoint position, Gfx::Bitmap const& source, IntRect const& src_rect)
{
return blit_filtered(position, source, src_rect, [](Color src) {
return src.to_grayscale().lightened();
});
}
void Painter::draw_tiled_bitmap(IntRect const& a_dst_rect, Gfx::Bitmap const& source)
{
VERIFY((source.scale() == 1 || source.scale() == scale()) && "draw_tiled_bitmap only supports integer upsampling");
auto dst_rect = a_dst_rect.translated(translation());
auto clipped_rect = dst_rect.intersected(clip_rect());
if (clipped_rect.is_empty())
return;
int scale = this->scale();
clipped_rect *= scale;