PatternHandler: remove unused code

hrev17117 implemented B_OP_COPY with a special treatment for text.
hrev21929 introduced the color cache to speed up that text drawing.
hrev52753 removed the special treatment of text in B_OP_COPY, but left the
color cache and the text flag behind.

Change-Id: Ib506c80a660e829132bce3ec1cb354fcfbab266c
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4931
Reviewed-by: waddlesplash <waddlesplash@gmail.com>

app_server: Implement more composition modes

* Use agg::comp_op classes to blend pixels.
* Subpixel path not implemented.
* Needed by WebKit.
* Implements #10274.

Change-Id: I07b0002196fd0a05fc100bd9f6d703c33cadc85b
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2932
Reviewed-by: X512 <danger_mail@list.ru>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

Get rid of special B_OP_COPY implementation for rendering text

Since BeOS had no anti-aliased drawing except for text, it didn't
matter whether drawing diagonal lines (for example) in B_OP_COPY
or B_OP_OVER. Applying the meaning of B_OP_COPY strictly to everything
else would have broken pretty much every existing BeOS, resulting
in broken drawing for anything but straight lines and rectangles.
The solution was to treat B_OP_COPY just like B_OP_OVER *except*
for text rendering, where we could be compatible with the BeOS
behavior. Nevertheless, one can sometimes observe apps using B_OP_COPY
where they /should/ be using B_OP_OVER for rendering text, resulting
in white edges around the glyphs where the actual LowColor() does not
match the current background on which the text is rendered.
There is however a problem when glyphs in a string overlap. Some
fonts have overlapping glyphs by default (handwriting, etc). With
the LCD sub-pixel filtering, this problem is visible even in fonts
where glyphs don't overlap normally, for example 'lt'. The leftmost
pixel of the 't' is smeared due to the filtering and produces an
almost transparent pixel which is rendered (using the low color as
the background) on top of the 'l'. To fix this, one would have to
render the string into an alpha mask buffer first, and then blend it
all at once using B_OP_COPY. This however defeats the point of
B_OP_COPY, which is to be a performance optimization. So instead, I
opted for the solution that is already in place for everything else,
which is to make B_OP_COPY behave like B_OP_OVER. For the case that
this would have produced a difference, i.e. rendering with the solid
high color, one needs to clear the background using the low color,
before rendering text, or it would have looked broken. So in practice,
there cannot be a difference.

Change-Id: I4348902ae754507f1429e0a9575f03d8ecbce333
Reviewed-on: https://review.haiku-os.org/c/877
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

app_server: add pixel alpha composite solid mode

* Same concept as the previously exisiting drawing mode
implementations for e.g. pixel alpha overlay mode: when pattern
is solid, provide a separate mode implementation which does no
unnecessary pattern pixel lookups. This provides a considerable
speedup in composite mode when no stipple pattern is used.

Patch by Andrej Spielmann (GSoC):
* Simplified the subpixel related methods for the AGG "pixel format" template
interface, the ones for the solid cover simply pass through the existing
methods, so only one subpixel blending function is left which does the actual
work (this removes a lot of the previously added code)
* Implemented a new rasterizer based on the original AGG rasterizer which
implements subpixel anti-aliasing for any generic AGG vector pipelines. It
is now optionally used in Painter and AGGTextRenderer (for vector fonts, ie
rotated, sheared or big enough fonts) depending on the global subpixel
setting.
* Put all subpixel variables into the new GlobalSubpixelSettings.h|cpp
* Simplified DesktopSettings related classes a bit and renamed previous
FontSubpixelAntialiasing to just SubpixelAntialiasing.
* The private libbe functions for subpixel related settings moved from Font.cpp
to InterfaceDefs.cpp where other such functions live. They are not related
to fonts only anymore.
* Removed the subpixel related settings again from the Fonts preflet and added
them to the Appearance preflet instead.

All of the above implements subpixel anti-aliasing on a global scale, which
to my knowledge no other OS is doing at the moment. Any vector rendering
can optionally use subpixel anti-aliasing in Haiku now. The bitmap cached fonts
are still affected by the Freetype complile time #define to enable the patented
subpixel rasterization (three times wide glyphs). Vector fonts and shapes are
not affected though at the moment.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26755 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch by Andrej Spielmann (GSOC):
* Integrate the subpixel rendering with the existing drawing backend and
the font rendering.
* The font cache has got an additional rendering type for extracting and
caching glyph bitmaps that store subpixel coverage values.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26361 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fix obviously swapped if statement checking for a solid pattern.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26071 a95241bf-73f2-0310-859d-f6bbb57e9c96

* on R5, the meaning of B_CONSTANT_ALPHA is a bit different
with regards to drawing bitmaps with alpha channel, instead
of ignoring the bitmap alpha channel, it is further multiplied
with the high color alpha channel, so basically, you can
use the high color alpha as a "global" alpha value to
draw the bitmap with
* removed some duplicate code


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18843 a95241bf-73f2-0310-859d-f6bbb57e9c96

added tracking the usage of the special B_OP_COPY version for text

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17326 a95241bf-73f2-0310-859d-f6bbb57e9c96

* removed the special font renderer which was actually
the same as the normal one (one less renderer to update
the color of)
* added a special B_OP_COPY implementation for text, which
is in fact what the implementation was until now, so
just like on R5, you have to specify the correct low color
or you will see artifacts for the anti-aliased pixels
* implemented B_OP_COPY just like B_OP_OVER (only it draws
the low color too like it should). So all apps that
used B_OP_COPY to draw anything can continue to do so
without having to worry about the low color, it will
be anti-aliased against the actual background instead of
the low color (which made especially no sense when drawing
with the low color). Although this change makes it a bit
slower to use B_OP_COPY, Haiku is now much more compatible.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17117 a95241bf-73f2-0310-859d-f6bbb57e9c96

* extracted the frame buffer memcpy routine from HWInterface.cpp
into a new frame_buffer_support.h
* added blend32 routine for blending a certain color with
a scanline in the frame buffer
* added "solid" versions of B_OP_ALPHA drawing with
B_ALPHA_OVERLAY alha function (blending on top of
a non-transparent background such as the frame buffer)
* implemented an optimized shortcut for alpha blended
FillRect() in Painter
* used the "packed" version of scanlines for shapes with
an outline thicker than 4 pixels (and filled shapes anyways),
this improves drawing speed when there are a few anti-aliased
pixels at the beginning of a scanline, then a solid fill and
some anti-aliased pixels at the end of the scanline. Such as
large letters.

To summarize: The alpha blending in Painter seems to be about
1.45 times faster than on BeOS R5 which benefits drawing large
shapes. For example, drawing a large alpha blended rounded rect
is 1.28 times faster on the Haiku app_server. On the other hand,
B_OP_COPY is quite tough to beat. It is currently 10 times faster
on R5. But a great deal seems to be caused by the Painter
rasterization algorithm itself, since commenting out the actual
drawing doesn't gain any speed.
The other useful experience I collected was that reading and
writing and over the PCI bus in the same loop really hurts
performance. It is actually faster (like 1.8 times!!) to allocate
a second buffer, read from frame buffer into that, doing the
blending at the same time, then writing the buffer back to the
screen.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15698 a95241bf-73f2-0310-859d-f6bbb57e9c96

forgot to commit the heart of the new drawing_mode implementation. Sorry about that, guys. Thou shalt use svn status after doing huge changes...

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15600 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch by Andrej Spielmann (GSoC):
* Simplified the subpixel related methods for the AGG "pixel format" template
interface, the ones for the solid cover simply pass through the existing
methods, so only one subpixel blending function is left which does the actual
work (this removes a lot of the previously added code)
* Implemented a new rasterizer based on the original AGG rasterizer which
implements subpixel anti-aliasing for any generic AGG vector pipelines. It
is now optionally used in Painter and AGGTextRenderer (for vector fonts, ie
rotated, sheared or big enough fonts) depending on the global subpixel
setting.
* Put all subpixel variables into the new GlobalSubpixelSettings.h|cpp
* Simplified DesktopSettings related classes a bit and renamed previous
FontSubpixelAntialiasing to just SubpixelAntialiasing.
* The private libbe functions for subpixel related settings moved from Font.cpp
to InterfaceDefs.cpp where other such functions live. They are not related
to fonts only anymore.
* Removed the subpixel related settings again from the Fonts preflet and added
them to the Appearance preflet instead.

All of the above implements subpixel anti-aliasing on a global scale, which
to my knowledge no other OS is doing at the moment. Any vector rendering
can optionally use subpixel anti-aliasing in Haiku now. The bitmap cached fonts
are still affected by the Freetype complile time #define to enable the patented
subpixel rasterization (three times wide glyphs). Vector fonts and shapes are
not affected though at the moment.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26755 a95241bf-73f2-0310-859d-f6bbb57e9c96

Patch by Andrej Spielmann (GSOC):
* Integrate the subpixel rendering with the existing drawing backend and
the font rendering.
* The font cache has got an additional rendering type for extracting and
caching glyph bitmaps that store subpixel coverage values.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26361 a95241bf-73f2-0310-859d-f6bbb57e9c96

Fix obviously swapped if statement checking for a solid pattern.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26071 a95241bf-73f2-0310-859d-f6bbb57e9c96

* on R5, the meaning of B_CONSTANT_ALPHA is a bit different
with regards to drawing bitmaps with alpha channel, instead
of ignoring the bitmap alpha channel, it is further multiplied
with the high color alpha channel, so basically, you can
use the high color alpha as a "global" alpha value to
draw the bitmap with
* removed some duplicate code


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@18843 a95241bf-73f2-0310-859d-f6bbb57e9c96

added tracking the usage of the special B_OP_COPY version for text

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17326 a95241bf-73f2-0310-859d-f6bbb57e9c96

* removed the special font renderer which was actually
the same as the normal one (one less renderer to update
the color of)
* added a special B_OP_COPY implementation for text, which
is in fact what the implementation was until now, so
just like on R5, you have to specify the correct low color
or you will see artifacts for the anti-aliased pixels
* implemented B_OP_COPY just like B_OP_OVER (only it draws
the low color too like it should). So all apps that
used B_OP_COPY to draw anything can continue to do so
without having to worry about the low color, it will
be anti-aliased against the actual background instead of
the low color (which made especially no sense when drawing
with the low color). Although this change makes it a bit
slower to use B_OP_COPY, Haiku is now much more compatible.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@17117 a95241bf-73f2-0310-859d-f6bbb57e9c96

* extracted the frame buffer memcpy routine from HWInterface.cpp
into a new frame_buffer_support.h
* added blend32 routine for blending a certain color with
a scanline in the frame buffer
* added "solid" versions of B_OP_ALPHA drawing with
B_ALPHA_OVERLAY alha function (blending on top of
a non-transparent background such as the frame buffer)
* implemented an optimized shortcut for alpha blended
FillRect() in Painter
* used the "packed" version of scanlines for shapes with
an outline thicker than 4 pixels (and filled shapes anyways),
this improves drawing speed when there are a few anti-aliased
pixels at the beginning of a scanline, then a solid fill and
some anti-aliased pixels at the end of the scanline. Such as
large letters.

To summarize: The alpha blending in Painter seems to be about
1.45 times faster than on BeOS R5 which benefits drawing large
shapes. For example, drawing a large alpha blended rounded rect
is 1.28 times faster on the Haiku app_server. On the other hand,
B_OP_COPY is quite tough to beat. It is currently 10 times faster
on R5. But a great deal seems to be caused by the Painter
rasterization algorithm itself, since commenting out the actual
drawing doesn't gain any speed.
The other useful experience I collected was that reading and
writing and over the PCI bus in the same loop really hurts
performance. It is actually faster (like 1.8 times!!) to allocate
a second buffer, read from frame buffer into that, doing the
blending at the same time, then writing the buffer back to the
screen.



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15698 a95241bf-73f2-0310-859d-f6bbb57e9c96

forgot to commit the heart of the new drawing_mode implementation. Sorry about that, guys. Thou shalt use svn status after doing huge changes...

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@15600 a95241bf-73f2-0310-859d-f6bbb57e9c96