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WindowServer: Support windows with alpha channels. And per-WSWindow opacity.

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This patch also adds a Format concept to GraphicsBitmap. For now there are
only two formats: RGB32 and RGBA32. Windows with alpha channel have their
backing stores created in the RGBA32 format.

Use this to make Terminal windows semi-transparent for that comfy rice look.
There is one problem here, in that window compositing overdraw incurs
multiple passes of blending of the same pixels. This leads to a mismatch in
opacity which is obviously not good. I will work on this in a later patch.

The alpha blending is currently straight C++. It should be relatively easy
to optimize this using SSE instructions.

For now I'm just happy with the cute effect. :^)
This commit is contained in:
Andreas Kling 2019-02-19 01:42:53 +01:00
parent d4973842c9
commit 9b71307d49
25 changed files with 244 additions and 71 deletions
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25
SharedGraphics/GraphicsBitmap.cpp
View file

@ -5,14 +5,15 @@
#include <errno.h>
#include <stdio.h>
RetainPtr<GraphicsBitmap> GraphicsBitmap::create(const Size& size)
RetainPtr<GraphicsBitmap> GraphicsBitmap::create(Format format, const Size& size)
{
return adopt(*new GraphicsBitmap(size));
return adopt(*new GraphicsBitmap(format, size));
}
GraphicsBitmap::GraphicsBitmap(const Size& size)
GraphicsBitmap::GraphicsBitmap(Format format, const Size& size)
: m_size(size)
, m_pitch(size.width() * sizeof(RGBA32))
, m_format(format)
{
size_t size_in_bytes = size.area() * sizeof(RGBA32);
m_data = (RGBA32*)mmap(nullptr, size_in_bytes, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
@ -21,12 +22,12 @@ GraphicsBitmap::GraphicsBitmap(const Size& size)
m_mmaped = true;
}
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_wrapper(const Size& size, RGBA32* data)
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_wrapper(Format format, const Size& size, RGBA32* data)
{
return adopt(*new GraphicsBitmap(size, data));
return adopt(*new GraphicsBitmap(format, size, data));
}
RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(const String& path, const Size& size)
RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(Format format, const String& path, const Size& size)
{
int fd = open(path.characters(), O_RDONLY, 0644);
if (fd < 0) {
@ -44,19 +45,20 @@ RetainPtr<GraphicsBitmap> GraphicsBitmap::load_from_file(const String& path, con
int rc = close(fd);
ASSERT(rc == 0);
auto bitmap = create_wrapper(size, mapped_data);
auto bitmap = create_wrapper(format, size, mapped_data);
bitmap->m_mmaped = true;
return bitmap;
}
GraphicsBitmap::GraphicsBitmap(const Size& size, RGBA32* data)
GraphicsBitmap::GraphicsBitmap(Format format, const Size& size, RGBA32* data)
: m_size(size)
, m_data(data)
, m_pitch(size.width() * sizeof(RGBA32))
, m_format(format)
{
}
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(int shared_buffer_id, const Size& size, RGBA32* data)
RetainPtr<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(Format format, int shared_buffer_id, const Size& size, RGBA32* data)
{
if (!data) {
void* shared_buffer = get_shared_buffer(shared_buffer_id);
@ -64,13 +66,14 @@ RetainPtr<GraphicsBitmap> GraphicsBitmap::create_with_shared_buffer(int shared_b
return nullptr;
data = (RGBA32*)shared_buffer;
}
return adopt(*new GraphicsBitmap(shared_buffer_id, size, data));
return adopt(*new GraphicsBitmap(format, shared_buffer_id, size, data));
}
GraphicsBitmap::GraphicsBitmap(int shared_buffer_id, const Size& size, RGBA32* data)
GraphicsBitmap::GraphicsBitmap(Format format, int shared_buffer_id, const Size& size, RGBA32* data)
: m_size(size)
, m_data(data)
, m_pitch(size.width() * sizeof(RGBA32))
, m_format(format)
, m_shared_buffer_id(shared_buffer_id)
{
}