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Start working on a simple Launcher app.

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Let GButton have an optional icon (GraphicsBitmap) that gets rendered in the
middle of the button if present.

Also add GraphicsBitmap::load_from_file() which allows mmap'ed RGBA32 files.
I wrote a little program to take "raw" files from GIMP and swizzle them into
the correct byte order.
This commit is contained in:
Andreas Kling 2019-02-07 23:13:47 +01:00
parent 71b9ec1ae0
commit 887b4a7a1a
29 changed files with 293 additions and 11 deletions
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28
SharedGraphics/Painter.cpp
View file

@ -368,6 +368,7 @@ void Painter::draw_focus_rect(const Rect& rect)
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();
@ -383,6 +384,33 @@ void Painter::blit(const Point& position, const GraphicsBitmap& source, const Re
}
}
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)
{
m_clip_rect = Rect::intersection(rect, m_target->rect());