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serenity/Userland/Libraries/LibGfx/ClassicStylePainter.cpp
thankyouverycool bb4963a697 LibGfx+LibGUI: Add FrameShape::Window
This shape is for use by the main widget of a frameless window
that still wishes to have proper borders but no title.

Raised Containers were used previously for this pattern but did not
always represent perspective and shadow correctly depending on thread
highlighting and the immediate background color. Containers are
really meant to be used inside other widgets where the background
color can be controlled.
2022-02-25 19:38:23 +01:00

529 lines
26 KiB
C++

/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2020, Sarah Taube <metalflakecobaltpaint@gmail.com>
* Copyright (c) 2021, Filiph Sandström <filiph.sandstrom@filfatstudios.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/StringView.h>
#include <LibGfx/Bitmap.h>
#include <LibGfx/CharacterBitmap.h>
#include <LibGfx/ClassicStylePainter.h>
#include <LibGfx/Painter.h>
#include <LibGfx/Palette.h>
namespace Gfx {
void ClassicStylePainter::paint_tab_button(Painter& painter, IntRect const& rect, Palette const& palette, bool active, bool hovered, bool enabled, bool top, bool in_active_window)
{
Color base_color = palette.button();
Color highlight_color2 = palette.threed_highlight();
Color shadow_color1 = palette.threed_shadow1();
Color shadow_color2 = palette.threed_shadow2();
if (hovered && enabled && !active)
base_color = palette.hover_highlight();
PainterStateSaver saver(painter);
painter.translate(rect.location());
if (top) {
// Base
painter.fill_rect({ 1, 1, rect.width() - 2, rect.height() - 1 }, base_color);
// Top line
if (active) {
auto accent = palette.accent();
if (!in_active_window)
accent = accent.to_grayscale();
painter.draw_line({ 3, 0 }, { rect.width() - 3, 0 }, accent.darkened());
Gfx::IntRect accent_rect { 1, 1, rect.width() - 2, 2 };
painter.fill_rect_with_gradient(accent_rect, accent, accent.lightened(1.5f));
painter.set_pixel({ 2, 0 }, highlight_color2);
} else {
painter.draw_line({ 2, 0 }, { rect.width() - 3, 0 }, highlight_color2);
}
// Left side
painter.draw_line({ 0, 2 }, { 0, rect.height() - 1 }, highlight_color2);
painter.set_pixel({ 1, 1 }, highlight_color2);
// Right side
IntPoint top_right_outer { rect.width() - 1, 2 };
IntPoint bottom_right_outer { rect.width() - 1, rect.height() - 1 };
painter.draw_line(top_right_outer, bottom_right_outer, shadow_color2);
IntPoint top_right_inner { rect.width() - 2, 2 };
IntPoint bottom_right_inner { rect.width() - 2, rect.height() - 1 };
painter.draw_line(top_right_inner, bottom_right_inner, shadow_color1);
painter.set_pixel(rect.width() - 2, 1, shadow_color2);
} else {
// Base
painter.fill_rect({ 0, 0, rect.width() - 1, rect.height() }, base_color);
// Bottom line
if (active) {
auto accent = palette.accent();
if (!in_active_window)
accent = accent.to_grayscale();
Gfx::IntRect accent_rect { 1, rect.height() - 3, rect.width() - 2, 2 };
painter.fill_rect_with_gradient(accent_rect, accent, accent.lightened(1.5f));
painter.draw_line({ 2, rect.height() - 1 }, { rect.width() - 3, rect.height() - 1 }, accent.darkened());
} else {
painter.draw_line({ 2, rect.height() - 1 }, { rect.width() - 3, rect.height() - 1 }, shadow_color2);
}
// Left side
painter.draw_line({ 0, 0 }, { 0, rect.height() - 3 }, highlight_color2);
painter.set_pixel({ 1, rect.height() - 2 }, highlight_color2);
// Right side
IntPoint top_right_outer { rect.width() - 1, 0 };
IntPoint bottom_right_outer { rect.width() - 1, rect.height() - 3 };
painter.draw_line(top_right_outer, bottom_right_outer, shadow_color2);
IntPoint top_right_inner { rect.width() - 2, 0 };
IntPoint bottom_right_inner { rect.width() - 2, rect.height() - 3 };
painter.draw_line(top_right_inner, bottom_right_inner, shadow_color1);
painter.set_pixel(rect.width() - 2, rect.height() - 2, shadow_color2);
}
}
static void paint_button_new(Painter& painter, IntRect const& a_rect, Palette const& palette, ButtonStyle style, bool pressed, bool checked, bool hovered, bool enabled, bool focused, bool default_button)
{
Color button_color = palette.button();
Color highlight_color = palette.threed_highlight();
Color shadow_color1 = palette.threed_shadow1();
Color shadow_color2 = palette.threed_shadow2();
if (checked && enabled) {
if (hovered)
button_color = palette.hover_highlight();
else
button_color = palette.button();
} else if (hovered && enabled)
button_color = palette.hover_highlight();
PainterStateSaver saver(painter);
auto rect = a_rect;
if (focused || default_button) {
painter.draw_rect(a_rect, palette.threed_shadow2());
rect.shrink(2, 2);
}
painter.translate(rect.location());
if (pressed || checked) {
// Base
Gfx::IntRect base_rect { 1, 1, rect.width() - 2, rect.height() - 2 };
if (checked && !pressed)
painter.fill_rect_with_dither_pattern(base_rect, palette.button().lightened(1.3f), palette.button());
else
painter.fill_rect(base_rect, button_color);
// Top shadow
painter.draw_line({ 0, 0 }, { rect.width() - 2, 0 }, shadow_color2);
painter.draw_line({ 0, 0 }, { 0, rect.height() - 2 }, shadow_color2);
// Sunken shadow
painter.draw_line({ 1, 1 }, { rect.width() - 3, 1 }, shadow_color1);
painter.draw_line({ 1, 2 }, { 1, rect.height() - 3 }, shadow_color1);
// Outer highlight
painter.draw_line({ 0, rect.height() - 1 }, { rect.width() - 1, rect.height() - 1 }, highlight_color);
painter.draw_line({ rect.width() - 1, 0 }, { rect.width() - 1, rect.height() - 2 }, highlight_color);
// Inner highlight
painter.draw_line({ 1, rect.height() - 2 }, { rect.width() - 2, rect.height() - 2 }, palette.button());
painter.draw_line({ rect.width() - 2, 1 }, { rect.width() - 2, rect.height() - 3 }, palette.button());
} else {
// Base
painter.fill_rect({ 0, 0, rect.width(), rect.height() }, button_color);
// Top highlight
if (style == ButtonStyle::Normal) {
painter.draw_line({ 0, 0 }, { rect.width() - 2, 0 }, highlight_color);
painter.draw_line({ 0, 0 }, { 0, rect.height() - 2 }, highlight_color);
} else if (style == ButtonStyle::ThickCap) {
painter.draw_line({ 1, 1 }, { rect.width() - 2, 1 }, highlight_color);
painter.draw_line({ 1, 1 }, { 1, rect.height() - 2 }, highlight_color);
}
// Outer shadow
painter.draw_line({ 0, rect.height() - 1 }, { rect.width() - 1, rect.height() - 1 }, shadow_color2);
painter.draw_line({ rect.width() - 1, 0 }, { rect.width() - 1, rect.height() - 2 }, shadow_color2);
// Inner shadow
painter.draw_line({ 1, rect.height() - 2 }, { rect.width() - 2, rect.height() - 2 }, shadow_color1);
painter.draw_line({ rect.width() - 2, 1 }, { rect.width() - 2, rect.height() - 3 }, shadow_color1);
}
}
void ClassicStylePainter::paint_button(Painter& painter, IntRect const& rect, Palette const& palette, ButtonStyle button_style, bool pressed, bool hovered, bool checked, bool enabled, bool focused, bool default_button)
{
if (button_style == ButtonStyle::Normal || button_style == ButtonStyle::ThickCap)
return paint_button_new(painter, rect, palette, button_style, pressed, checked, hovered, enabled, focused, default_button);
if (button_style == ButtonStyle::Coolbar && !enabled)
return;
Color button_color = palette.button();
Color highlight_color = palette.threed_highlight();
Color shadow_color = button_style == ButtonStyle::Coolbar ? palette.threed_shadow1() : palette.threed_shadow2();
PainterStateSaver saver(painter);
painter.translate(rect.location());
if (pressed || checked) {
// Base
IntRect base_rect { 1, 1, rect.width() - 2, rect.height() - 2 };
if (button_style == ButtonStyle::Coolbar) {
if (checked && !pressed) {
painter.fill_rect_with_dither_pattern(base_rect, palette.button().lightened(1.3f), Color());
} else {
painter.fill_rect(base_rect, button_color);
}
}
// Sunken shadow
painter.draw_line({ 1, 1 }, { rect.width() - 2, 1 }, shadow_color);
painter.draw_line({ 1, 2 }, { 1, rect.height() - 2 }, shadow_color);
// Bottom highlight
painter.draw_line({ rect.width() - 2, 1 }, { rect.width() - 2, rect.height() - 3 }, highlight_color);
painter.draw_line({ 1, rect.height() - 2 }, { rect.width() - 2, rect.height() - 2 }, highlight_color);
} else if (hovered) {
if (button_style == ButtonStyle::Coolbar) {
// Base
painter.fill_rect({ 1, 1, rect.width() - 2, rect.height() - 2 }, button_color);
}
// Top highlight
painter.draw_line({ 1, 1 }, { rect.width() - 2, 1 }, highlight_color);
painter.draw_line({ 1, 2 }, { 1, rect.height() - 2 }, highlight_color);
// Bottom shadow
painter.draw_line({ rect.width() - 2, 1 }, { rect.width() - 2, rect.height() - 3 }, shadow_color);
painter.draw_line({ 1, rect.height() - 2 }, { rect.width() - 2, rect.height() - 2 }, shadow_color);
}
}
void ClassicStylePainter::paint_frame(Painter& painter, IntRect const& rect, Palette const& palette, FrameShape shape, FrameShadow shadow, int thickness, bool skip_vertical_lines)
{
if (shape == Gfx::FrameShape::NoFrame)
return;
if (shape == FrameShape::Window) {
StylePainter::paint_window_frame(painter, rect, palette);
return;
}
Color top_left_color;
Color bottom_right_color;
Color dark_shade = palette.threed_shadow1();
Color light_shade = palette.threed_highlight();
if (shape == FrameShape::Container && thickness >= 2) {
if (shadow == FrameShadow::Raised) {
dark_shade = palette.threed_shadow2();
}
}
if (shadow == FrameShadow::Raised) {
top_left_color = light_shade;
bottom_right_color = dark_shade;
} else if (shadow == FrameShadow::Sunken) {
top_left_color = dark_shade;
bottom_right_color = light_shade;
} else if (shadow == FrameShadow::Plain) {
top_left_color = dark_shade;
bottom_right_color = dark_shade;
}
if (thickness >= 1) {
painter.draw_line(rect.top_left(), rect.top_right(), top_left_color);
painter.draw_line(rect.bottom_left(), rect.bottom_right(), bottom_right_color);
if (shape != FrameShape::Panel || !skip_vertical_lines) {
painter.draw_line(rect.top_left().translated(0, 1), rect.bottom_left().translated(0, -1), top_left_color);
painter.draw_line(rect.top_right(), rect.bottom_right().translated(0, -1), bottom_right_color);
}
}
if (shape == FrameShape::Container && thickness >= 2) {
Color top_left_color;
Color bottom_right_color;
Color dark_shade = palette.threed_shadow2();
Color light_shade = palette.button();
if (shadow == FrameShadow::Raised) {
dark_shade = palette.threed_shadow1();
top_left_color = light_shade;
bottom_right_color = dark_shade;
} else if (shadow == FrameShadow::Sunken) {
top_left_color = dark_shade;
bottom_right_color = light_shade;
} else if (shadow == FrameShadow::Plain) {
top_left_color = dark_shade;
bottom_right_color = dark_shade;
}
IntRect inner_container_frame_rect = rect.shrunken(2, 2);
painter.draw_line(inner_container_frame_rect.top_left(), inner_container_frame_rect.top_right(), top_left_color);
painter.draw_line(inner_container_frame_rect.bottom_left(), inner_container_frame_rect.bottom_right(), bottom_right_color);
painter.draw_line(inner_container_frame_rect.top_left().translated(0, 1), inner_container_frame_rect.bottom_left().translated(0, -1), top_left_color);
painter.draw_line(inner_container_frame_rect.top_right(), inner_container_frame_rect.bottom_right().translated(0, -1), bottom_right_color);
}
if (shape == FrameShape::Box && thickness >= 2) {
swap(top_left_color, bottom_right_color);
IntRect inner_rect = rect.shrunken(2, 2);
painter.draw_line(inner_rect.top_left(), inner_rect.top_right(), top_left_color);
painter.draw_line(inner_rect.bottom_left(), inner_rect.bottom_right(), bottom_right_color);
painter.draw_line(inner_rect.top_left().translated(0, 1), inner_rect.bottom_left().translated(0, -1), top_left_color);
painter.draw_line(inner_rect.top_right(), inner_rect.bottom_right().translated(0, -1), bottom_right_color);
}
}
void ClassicStylePainter::paint_window_frame(Painter& painter, IntRect const& rect, Palette const& palette)
{
Color base_color = palette.button();
Color dark_shade = palette.threed_shadow2();
Color mid_shade = palette.threed_shadow1();
Color light_shade = palette.threed_highlight();
auto border_thickness = palette.window_border_thickness();
auto border_radius = palette.window_border_radius();
if (border_radius > 0) {
// FIXME: This will draw "useless" pixels that'll get drawn over by the window contents.
// preferrably we should just remove the corner pixels from the completely drawn window
// but I don't know how to do that yet. :^)
painter.fill_rect_with_rounded_corners({ rect.x() - border_radius / 2,
rect.y() - border_radius / 2,
rect.width() + border_radius,
rect.height() + border_radius },
base_color, border_radius);
return;
}
painter.draw_rect_with_thickness({ rect.x() + border_thickness / 2,
rect.y() + border_thickness / 2,
rect.width() - border_thickness,
rect.height() - border_thickness },
base_color, border_thickness);
painter.draw_line(rect.top_left().translated(0, 1), rect.bottom_left(), base_color);
painter.draw_line(rect.top_left().translated(1, 1), rect.top_right().translated(-1, 1), light_shade);
painter.draw_line(rect.top_left().translated(1, 1), rect.bottom_left().translated(1, -1), light_shade);
painter.draw_line(rect.top_left().translated(2, 2), rect.top_right().translated(-2, 2), base_color);
painter.draw_line(rect.top_left().translated(2, 2), rect.bottom_left().translated(2, -2), base_color);
painter.draw_line(rect.top_left().translated(3, 3), rect.top_right().translated(-3, 3), base_color);
painter.draw_line(rect.top_left().translated(3, 3), rect.bottom_left().translated(3, -3), base_color);
painter.draw_line(rect.top_right(), rect.bottom_right(), dark_shade);
painter.draw_line(rect.top_right().translated(-1, 1), rect.bottom_right().translated(-1, -1), mid_shade);
painter.draw_line(rect.top_right().translated(-2, 2), rect.bottom_right().translated(-2, -2), base_color);
painter.draw_line(rect.top_right().translated(-3, 3), rect.bottom_right().translated(-3, -3), base_color);
painter.draw_line(rect.bottom_left(), rect.bottom_right(), dark_shade);
painter.draw_line(rect.bottom_left().translated(1, -1), rect.bottom_right().translated(-1, -1), mid_shade);
painter.draw_line(rect.bottom_left().translated(2, -2), rect.bottom_right().translated(-2, -2), base_color);
painter.draw_line(rect.bottom_left().translated(3, -3), rect.bottom_right().translated(-3, -3), base_color);
}
void ClassicStylePainter::paint_progressbar(Painter& painter, IntRect const& rect, Palette const& palette, int min, int max, int value, StringView text, Orientation orientation)
{
// First we fill the entire widget with the gradient. This incurs a bit of
// overdraw but ensures a consistent look throughout the progression.
Color start_color = palette.active_window_border1();
Color end_color = palette.active_window_border2();
painter.fill_rect_with_gradient(orientation, rect, start_color, end_color);
if (!text.is_null()) {
painter.draw_text(rect.translated(1, 1), text, TextAlignment::Center, palette.base_text());
painter.draw_text(rect, text, TextAlignment::Center, palette.base_text().inverted());
}
float range_size = max - min;
float progress = (value - min) / range_size;
// Then we carve out a hole in the remaining part of the widget.
// We draw the text a third time, clipped and inverse, for sharp contrast.
IntRect hole_rect;
if (orientation == Orientation::Horizontal) {
float progress_width = progress * rect.width();
hole_rect = { (int)progress_width, 0, (int)(rect.width() - progress_width), rect.height() };
} else {
float progress_height = progress * rect.height();
hole_rect = { 0, 0, rect.width(), (int)(rect.height() - progress_height) };
}
hole_rect.translate_by(rect.location());
hole_rect.set_right_without_resize(rect.right());
PainterStateSaver saver(painter);
painter.fill_rect(hole_rect, palette.base());
painter.add_clip_rect(hole_rect);
if (!text.is_null())
painter.draw_text(rect.translated(0, 0), text, TextAlignment::Center, palette.base_text());
}
static RefPtr<Gfx::Bitmap> s_unfilled_circle_bitmap;
static RefPtr<Gfx::Bitmap> s_filled_circle_bitmap;
static RefPtr<Gfx::Bitmap> s_changing_filled_circle_bitmap;
static RefPtr<Gfx::Bitmap> s_changing_unfilled_circle_bitmap;
static Gfx::Bitmap const& circle_bitmap(bool checked, bool changing)
{
if (changing)
return checked ? *s_changing_filled_circle_bitmap : *s_changing_unfilled_circle_bitmap;
return checked ? *s_filled_circle_bitmap : *s_unfilled_circle_bitmap;
}
void ClassicStylePainter::paint_radio_button(Painter& painter, IntRect const& rect, Palette const&, bool is_checked, bool is_being_pressed)
{
if (!s_unfilled_circle_bitmap) {
s_unfilled_circle_bitmap = Bitmap::try_load_from_file("/res/icons/serenity/unfilled-radio-circle.png").release_value_but_fixme_should_propagate_errors();
s_filled_circle_bitmap = Bitmap::try_load_from_file("/res/icons/serenity/filled-radio-circle.png").release_value_but_fixme_should_propagate_errors();
s_changing_filled_circle_bitmap = Bitmap::try_load_from_file("/res/icons/serenity/changing-filled-radio-circle.png").release_value_but_fixme_should_propagate_errors();
s_changing_unfilled_circle_bitmap = Bitmap::try_load_from_file("/res/icons/serenity/changing-unfilled-radio-circle.png").release_value_but_fixme_should_propagate_errors();
}
auto& bitmap = circle_bitmap(is_checked, is_being_pressed);
painter.blit(rect.location(), bitmap, bitmap.rect());
}
static char const* s_checked_bitmap_data = {
" "
" # "
" ## "
" ### "
" ## ### "
" ##### "
" ### "
" # "
" "
};
static Gfx::CharacterBitmap* s_checked_bitmap;
static int const s_checked_bitmap_width = 9;
static int const s_checked_bitmap_height = 9;
void ClassicStylePainter::paint_check_box(Painter& painter, IntRect const& rect, Palette const& palette, bool is_enabled, bool is_checked, bool is_being_pressed)
{
painter.fill_rect(rect, is_enabled ? palette.base() : palette.window());
paint_frame(painter, rect, palette, Gfx::FrameShape::Container, Gfx::FrameShadow::Sunken, 2);
if (is_being_pressed) {
// FIXME: This color should not be hard-coded.
painter.draw_rect(rect.shrunken(4, 4), Color::MidGray);
}
if (is_checked) {
if (!s_checked_bitmap)
s_checked_bitmap = &Gfx::CharacterBitmap::create_from_ascii(s_checked_bitmap_data, s_checked_bitmap_width, s_checked_bitmap_height).leak_ref();
painter.draw_bitmap(rect.shrunken(4, 4).location(), *s_checked_bitmap, is_enabled ? palette.base_text() : palette.threed_shadow1());
}
}
void ClassicStylePainter::paint_transparency_grid(Painter& painter, IntRect const& rect, Palette const& palette)
{
painter.fill_rect_with_checkerboard(rect, { 8, 8 }, palette.base().darkened(0.9), palette.base());
}
void ClassicStylePainter::paint_simple_rect_shadow(Painter& painter, IntRect const& containing_rect, Bitmap const& shadow_bitmap, bool shadow_includes_frame, bool fill_content)
{
// The layout of the shadow_bitmap is defined like this:
// +---------+----+---------+----+----+----+
// | TL | T | TR | LT | L | LB |
// +---------+----+---------+----+----+----+
// | BL | B | BR | RT | R | RB |
// +---------+----+---------+----+----+----+
// Located strictly on the top or bottom of the rectangle, above or below of the content:
// TL = top-left T = top TR = top-right
// BL = bottom-left B = bottom BR = bottom-right
// Located on the left or right of the rectangle, but not above or below of the content:
// LT = left-top L = left LB = left-bottom
// RT = right-top R = right RB = right-bottom
// So, the bitmap has two rows and 6 column, two of which are twice as wide.
// The height divided by two defines a cell size, and width of each
// column must be the same as the height of the cell, except for the
// first and third column, which are twice as wide.
// If fill_content is true, it will use the RGBA color of right-bottom pixel of TL to fill the rectangle enclosed
if (shadow_bitmap.height() % 2 != 0) {
dbgln("Can't paint simple rect shadow, shadow bitmap height {} is not even", shadow_bitmap.height());
return;
}
auto base_size = shadow_bitmap.height() / 2;
if (shadow_bitmap.width() != base_size * (6 + 2)) {
if (shadow_bitmap.width() % base_size != 0)
dbgln("Can't paint simple rect shadow, shadow bitmap width {} is not a multiple of {}", shadow_bitmap.width(), base_size);
else
dbgln("Can't paint simple rect shadow, shadow bitmap width {} but expected {}", shadow_bitmap.width(), base_size * (6 + 2));
return;
}
// The containing_rect should have been inflated appropriately
VERIFY(containing_rect.size().contains(Gfx::IntSize { base_size, base_size }));
auto sides_height = containing_rect.height() - 2 * base_size;
auto half_height = sides_height / 2;
auto containing_horizontal_rect = containing_rect;
int horizontal_shift = 0;
if (half_height < base_size && !shadow_includes_frame) {
// If the height is too small we need to shift the left/right accordingly, unless the shadow includes portions of the frame
horizontal_shift = base_size - half_height;
containing_horizontal_rect.set_left(containing_horizontal_rect.left() + horizontal_shift);
containing_horizontal_rect.set_right(containing_horizontal_rect.right() - 2 * horizontal_shift);
}
auto half_width = containing_horizontal_rect.width() / 2;
int corner_piece_width = min(containing_horizontal_rect.width() / 2, base_size * 2);
int left_corners_right = containing_horizontal_rect.left() + corner_piece_width;
int right_corners_left = max(containing_horizontal_rect.right() - corner_piece_width + 1, left_corners_right + 1);
auto paint_horizontal = [&](int y, int src_row) {
if (half_width <= 0)
return;
Gfx::PainterStateSaver save(painter);
painter.add_clip_rect({ containing_horizontal_rect.left(), y, containing_horizontal_rect.width(), base_size });
painter.blit({ containing_horizontal_rect.left(), y }, shadow_bitmap, { 0, src_row * base_size, corner_piece_width, base_size });
painter.blit({ right_corners_left, y }, shadow_bitmap, { 5 * base_size - corner_piece_width, src_row * base_size, corner_piece_width, base_size });
for (int x = left_corners_right; x < right_corners_left; x += base_size) {
auto width = min(right_corners_left - x, base_size);
painter.blit({ x, y }, shadow_bitmap, { corner_piece_width, src_row * base_size, width, base_size });
}
};
paint_horizontal(containing_rect.top(), 0);
paint_horizontal(containing_rect.bottom() - base_size + 1, 1);
int corner_piece_height = min(half_height, base_size);
int top_corners_bottom = base_size + corner_piece_height;
int bottom_corners_top = base_size + max(half_height, sides_height - corner_piece_height);
auto paint_vertical = [&](int x, int src_row, int hshift, int hsrcshift) {
Gfx::PainterStateSaver save(painter);
painter.add_clip_rect({ x, containing_rect.y() + base_size, base_size, containing_rect.height() - 2 * base_size });
painter.blit({ x + hshift, containing_rect.top() + top_corners_bottom - corner_piece_height }, shadow_bitmap, { base_size * 5 + hsrcshift, src_row * base_size, base_size - hsrcshift, corner_piece_height });
painter.blit({ x + hshift, containing_rect.top() + bottom_corners_top }, shadow_bitmap, { base_size * 7 + hsrcshift, src_row * base_size + base_size - corner_piece_height, base_size - hsrcshift, corner_piece_height });
for (int y = top_corners_bottom; y < bottom_corners_top; y += base_size) {
auto height = min(bottom_corners_top - y, base_size);
painter.blit({ x, containing_rect.top() + y }, shadow_bitmap, { base_size * 6, src_row * base_size, base_size, height });
}
};
paint_vertical(containing_rect.left(), 0, horizontal_shift, 0);
if (shadow_includes_frame)
horizontal_shift = 0; // TODO: fix off-by-one on rectangles barely wide enough
paint_vertical(containing_rect.right() - base_size + 1, 1, 0, horizontal_shift);
if (fill_content) {
// Fill the enclosed rectangle with the RGBA color of the right-bottom pixel of the TL tile
auto inner_rect = containing_rect.shrunken(2 * base_size, 2 * base_size);
if (!inner_rect.is_empty())
painter.fill_rect(inner_rect, shadow_bitmap.get_pixel(2 * base_size - 1, base_size - 1));
}
}
}