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SharedGraphics: Fix blitting GraphicsBitmaps with clipping enabled.

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This commit is contained in:
Andreas Kling 2019-02-10 07:46:29 +01:00
parent f7831f8c76
commit 4a7120afe1
1 changed files with 61 additions and 53 deletions
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114
SharedGraphics/Painter.cpp
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@ -212,15 +212,15 @@ void Painter::draw_bitmap(const Point& p, const CharacterBitmap& bitmap, Color c
void Painter::draw_bitmap(const Point& p, const GlyphBitmap& bitmap, Color color) void Painter::draw_bitmap(const Point& p, const GlyphBitmap& bitmap, Color color)
{ {
Rect rect { p, bitmap.size() }; Rect dst_rect { p, bitmap.size() };
rect.move_by(m_translation); dst_rect.move_by(m_translation);
auto clipped_rect = Rect::intersection(rect, m_clip_rect); auto clipped_rect = Rect::intersection(dst_rect, m_clip_rect);
if (clipped_rect.is_empty()) if (clipped_rect.is_empty())
return; return;
const int first_row = clipped_rect.top() - rect.top(); const int first_row = clipped_rect.top() - dst_rect.top();
const int last_row = clipped_rect.bottom() - rect.top(); const int last_row = clipped_rect.bottom() - dst_rect.top();
const int first_column = clipped_rect.left() - rect.left(); const int first_column = clipped_rect.left() - dst_rect.left();
const int last_column = clipped_rect.right() - rect.left(); const int last_column = clipped_rect.right() - dst_rect.left();
RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x(); RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
const size_t dst_skip = m_target->width(); const size_t dst_skip = m_target->width();
@ -233,6 +233,60 @@ void Painter::draw_bitmap(const Point& p, const GlyphBitmap& bitmap, Color color
} }
} }
void Painter::blit_with_alpha(const Point& position, const GraphicsBitmap& source, const Rect& src_rect)
{
Rect dst_rect(position, src_rect.size());
dst_rect.move_by(m_translation);
auto clipped_rect = Rect::intersection(dst_rect, m_clip_rect);
if (clipped_rect.is_empty())
return;
const int first_row = clipped_rect.top() - dst_rect.top();
const int last_row = clipped_rect.bottom() - dst_rect.top();
const int first_column = clipped_rect.left() - dst_rect.left();
const int last_column = clipped_rect.right() - dst_rect.left();
RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
const RGBA32* src = source.scanline(src_rect.top() + first_row) + src_rect.left() + first_column;
const size_t dst_skip = m_target->width();
const unsigned src_skip = source.width();
for (int row = first_row; row <= last_row; ++row) {
for (int x = 0; x <= (last_column - first_column); ++x) {
byte alpha = Color(src[x]).alpha();
if (alpha == 0xff)
dst[x] = src[x];
else if (!alpha)
continue;
else
dst[x] = Color(dst[x]).blend(src[x]).value();
}
dst += dst_skip;
src += src_skip;
}
}
void Painter::blit(const Point& position, const GraphicsBitmap& source, const Rect& src_rect)
{
Rect dst_rect(position, src_rect.size());
dst_rect.move_by(m_translation);
auto clipped_rect = Rect::intersection(dst_rect, m_clip_rect);
if (clipped_rect.is_empty())
return;
const int first_row = clipped_rect.top() - dst_rect.top();
const int last_row = clipped_rect.bottom() - dst_rect.top();
const int first_column = clipped_rect.left() - dst_rect.left();
const int last_column = clipped_rect.right() - dst_rect.left();
RGBA32* dst = m_target->scanline(clipped_rect.y()) + clipped_rect.x();
const RGBA32* src = source.scanline(src_rect.top() + first_row) + src_rect.left() + first_column;
const size_t dst_skip = m_target->width();
const unsigned src_skip = source.width();
for (int row = first_row; row <= last_row; ++row) {
fast_dword_copy(dst, src, dst_rect.width());
dst += dst_skip;
src += src_skip;
}
}
FLATTEN void Painter::draw_glyph(const Point& point, char ch, Color color) FLATTEN void Painter::draw_glyph(const Point& point, char ch, Color color)
{ {
draw_bitmap(point, font().glyph_bitmap(ch), color); draw_bitmap(point, font().glyph_bitmap(ch), color);
@ -365,52 +419,6 @@ void Painter::draw_focus_rect(const Rect& rect)
draw_rect(focus_rect, Color(96, 96, 192)); draw_rect(focus_rect, Color(96, 96, 192));
} }
void Painter::blit(const Point& position, const GraphicsBitmap& source, const Rect& src_rect)
{
Rect dst_rect(position, src_rect.size());
dst_rect.move_by(m_translation);
dst_rect.intersect(m_clip_rect);
RGBA32* dst = m_target->scanline(dst_rect.y()) + dst_rect.x();
const RGBA32* src = source.scanline(src_rect.top()) + src_rect.left();
const unsigned dst_skip = m_target->width();
const unsigned src_skip = source.width();
for (int i = dst_rect.height() - 1; i >= 0; --i) {
fast_dword_copy(dst, src, dst_rect.width());
dst += dst_skip;
src += src_skip;
}
}
void Painter::blit_with_alpha(const Point& position, const GraphicsBitmap& source, const Rect& src_rect)
{
Rect dst_rect(position, src_rect.size());
dst_rect.move_by(m_translation);
dst_rect.intersect(m_clip_rect);
RGBA32* dst = m_target->scanline(dst_rect.y()) + dst_rect.x();
const RGBA32* src = source.scanline(src_rect.top()) + src_rect.left();
const unsigned dst_skip = m_target->width();
const unsigned src_skip = source.width();
for (int i = dst_rect.height() - 1; i >= 0; --i) {
for (int x = 0; x < dst_rect.width(); ++x) {
byte alpha = Color(src[x]).alpha();
if (alpha == 0xff)
dst[x] = src[x];
else if (!alpha)
continue;
else
dst[x] = Color(dst[x]).blend(src[x]).value();
}
dst += dst_skip;
src += src_skip;
}
}
void Painter::set_clip_rect(const Rect& rect) void Painter::set_clip_rect(const Rect& rect)
{ {
m_clip_rect = Rect::intersection(rect, m_target->rect()); m_clip_rect = Rect::intersection(rect, m_target->rect());