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#include "Painter.h"
#include "FrameBuffer.h"
#include "Widget.h"
#include "Font.h"
#include "Window.h"
#include <AK/Assertions.h>
#include <AK/StdLibExtras.h>
Painter::Painter(Widget& widget)
: m_widget(widget)
, m_font(&widget.font())
{
m_target = widget.backing();
ASSERT(m_target);
m_window = widget.window();
m_translation.moveBy(widget.relativePosition());
m_clipRect.setWidth(AbstractScreen::the().width());
m_clipRect.setHeight(AbstractScreen::the().height());
}
Painter::~Painter()
{
}
void Painter::fillRect(const Rect& rect, Color color)
{
Rect r = rect;
r.moveBy(m_translation);
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
auto* bits = m_target->scanline(y);
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] = color.value();
}
}
}
void Painter::drawRect(const Rect& rect, Color color)
{
Rect r = rect;
r.moveBy(m_translation);
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
auto* bits = m_target->scanline(y);
if (y == r.top() || y == (r.bottom() - 1)) {
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] = color.value();
}
} else {
if (r.left() >= m_clipRect.left() && r.left() < m_clipRect.right())
bits[r.left()] = color.value();
if (r.right() >= m_clipRect.left() && r.right() < m_clipRect.right())
bits[r.right() - 1] = color.value();
}
}
}
void Painter::xorRect(const Rect& rect, Color color)
{
Rect r = rect;
r.moveBy(m_translation);
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
auto* bits = m_target->scanline(y);
if (y == r.top() || y == (r.bottom() - 1)) {
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] ^= color.value();
}
} else {
if (r.left() >= m_clipRect.left() && r.left() < m_clipRect.right())
bits[r.left()] ^= color.value();
if (r.right() >= m_clipRect.left() && r.right() < m_clipRect.right())
bits[r.right() - 1] ^= color.value();
}
}
}
void Painter::drawBitmap(const Point& p, const CharacterBitmap& bitmap, Color color)
{
Point point = p;
point.moveBy(m_translation);
for (unsigned row = 0; row < bitmap.height(); ++row) {
int y = point.y() + row;
if (y < m_clipRect.top() || y >= m_clipRect.bottom())
break;
auto* bits = m_target->scanline(y);
for (unsigned j = 0; j < bitmap.width(); ++j) {
int x = point.x() + j;
if (x < m_clipRect.left() || x >= m_clipRect.right())
break;
char fc = bitmap.bits()[row * bitmap.width() + j];
if (fc == '#')
bits[x] = color.value();
}
}
}
void Painter::drawText(const Rect& rect, const String& text, TextAlignment alignment, Color color)
{
Point point;
if (alignment == TextAlignment::TopLeft) {
point = rect.location();
} else if (alignment == TextAlignment::CenterLeft) {
int textWidth = text.length() * font().glyphWidth();
point = { rect.x(), rect.center().y() - (font().glyphHeight() / 2) };
} else if (alignment == TextAlignment::Center) {
int textWidth = text.length() * font().glyphWidth();
point = rect.center();
point.moveBy(-(textWidth / 2), -(font().glyphHeight() / 2));
} else {
ASSERT_NOT_REACHED();
}
for (unsigned i = 0; i < text.length(); ++i) {
byte ch = text[i];
if (ch == ' ')
continue;
auto* bitmap = font().glyphBitmap(ch);
if (!bitmap) {
printf("Font doesn't have 0x%02x ('%c')\n", ch, ch);
ASSERT_NOT_REACHED();
}
int x = point.x() + i * font().glyphWidth();
int y = point.y();
drawBitmap({ x, y }, *bitmap, color);
}
}
void Painter::drawPixel(const Point& p, Color color)
{
auto point = p;
point.moveBy(m_translation);
if (!m_clipRect.contains(point))
return;
m_target->scanline(point.y())[point.x()] = color.value();
}
void Painter::drawLine(const Point& p1, const Point& p2, Color color)
{
auto point1 = p1;
point1.moveBy(m_translation);
auto point2 = p2;
point2.moveBy(m_translation);
// Special case: vertical line.
if (point1.x() == point2.x()) {
const int x = point1.x();
if (x < m_clipRect.left() || x >= m_clipRect.right())
return;
if (point1.y() > point2.y())
std::swap(point1, point2);
for (int y = max(point1.y(), m_clipRect.top()); y <= min(point2.y(), m_clipRect.bottom()); ++y)
m_target->scanline(y)[x] = color.value();
return;
}
if (point1.x() > point2.x())
std::swap(point1, point2);
// Special case: horizontal line.
if (point1.y() == point2.y()) {
const int y = point1.y();
if (y < m_clipRect.top() || y >= m_clipRect.bottom())
return;
if (point1.x() > point2.x())
std::swap(point1, point2);
auto* pixels = m_target->scanline(point1.y());
for (int x = max(point1.x(), m_clipRect.left()); x <= min(point2.x(), m_clipRect.right()); ++x)
pixels[x] = color.value();
return;
}
// FIXME: Implement clipping below.
ASSERT_NOT_REACHED();
const double dx = point2.x() - point1.x();
const double dy = point2.y() - point1.y();
const double deltaError = fabs(dy / dx);
double error = 0;
const double yStep = dy == 0 ? 0 : (dy > 0 ? 1 : -1);
int y = point1.y();
for (int x = point1.x(); x <= point2.x(); ++x) {
m_target->scanline(y)[x] = color.value();
error += deltaError;
if (error >= 0.5) {
y = (double)y + yStep;
error -= 1.0;
}
}
}
void Painter::drawFocusRect(const Rect& rect)
{
Rect focusRect = rect;
focusRect.moveBy(1, 1);
focusRect.setWidth(focusRect.width() - 2);
focusRect.setHeight(focusRect.height() - 2);
drawRect(focusRect, Color(96, 96, 192));
}
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