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Clip Painter operations to the screen rect.

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This commit is contained in:
Andreas Kling 2018-10-12 22:50:28 +02:00
parent b5ff34174d
commit aceedaf957
4 changed files with 45 additions and 17 deletions
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55
Widgets/Painter.cpp
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@ -4,6 +4,7 @@
#include "Font.h"
#include "Window.h"
#include <AK/Assertions.h>
#include <AK/StdLib.h>
#include <SDL.h>
Painter::Painter(Widget& widget)
@ -17,6 +18,9 @@ Painter::Painter(Widget& widget)
m_translation.setX(widget.x());
m_translation.setY(widget.y());
}
m_clipRect.setWidth(AbstractScreen::the().width());
m_clipRect.setHeight(AbstractScreen::the().height());
}
Painter::~Painter()
@ -36,9 +40,9 @@ void Painter::fillRect(const Rect& rect, Color color)
Rect r = rect;
r.moveBy(m_translation);
for (int y = r.top(); y < r.bottom(); ++y) {
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
dword* bits = scanline(y);
for (int x = r.left(); x < r.right(); ++x) {
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] = color.value();
}
}
@ -49,15 +53,17 @@ void Painter::drawRect(const Rect& rect, Color color)
Rect r = rect;
r.moveBy(m_translation);
for (int y = r.top(); y < r.bottom(); ++y) {
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
dword* bits = scanline(y);
if (y == r.top() || y == (r.bottom() - 1)) {
for (int x = r.left(); x < r.right(); ++x) {
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] = color.value();
}
} else {
bits[r.left()] = color.value();
bits[r.right() - 1] = color.value();
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();
}
}
}
@ -67,15 +73,17 @@ void Painter::xorRect(const Rect& rect, Color color)
Rect r = rect;
r.moveBy(m_translation);
for (int y = r.top(); y < r.bottom(); ++y) {
for (int y = max(r.top(), m_clipRect.top()); y < min(r.bottom(), m_clipRect.bottom()); ++y) {
dword* bits = scanline(y);
if (y == r.top() || y == (r.bottom() - 1)) {
for (int x = r.left(); x < r.right(); ++x) {
for (int x = max(r.left(), m_clipRect.left()); x < min(r.right(), m_clipRect.right()); ++x) {
bits[x] ^= color.value();
}
} else {
bits[r.left()] ^= color.value();
bits[r.right() - 1] ^= color.value();
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();
}
}
}
@ -86,12 +94,16 @@ void Painter::drawBitmap(const Point& p, const CBitmap& bitmap, Color color)
point.moveBy(m_translation);
for (unsigned row = 0; row < bitmap.height(); ++row) {
int y = point.y() + row;
int x = point.x();
if (y < m_clipRect.top() || y >= m_clipRect.bottom())
break;
dword* bits = 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 + j] = color.value();
bits[x] = color.value();
}
}
}
@ -129,6 +141,8 @@ void Painter::drawPixel(const Point& p, Color color)
{
auto point = p;
point.moveBy(m_translation);
if (!m_clipRect.contains(point))
return;
scanline(point.y())[point.x()] = color.value();
}
@ -142,10 +156,13 @@ void Painter::drawLine(const Point& p1, const Point& p2, Color color)
// 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 = point1.y(); y <= point2.y(); ++y)
scanline(y)[point1.x()] = color.value();
for (int y = max(point1.y(), m_clipRect.top()); y <= min(point2.y(), m_clipRect.bottom()); ++y)
scanline(y)[x] = color.value();
return;
}
@ -154,14 +171,20 @@ void Painter::drawLine(const Point& p1, const Point& p2, Color color)
// Special case: horizontal line.
if (point1.y() == point2.y()) {
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 = scanline(point1.y());
for (int x = point1.x(); x <= point2.x(); ++x)
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);