Without this, the bounding rect for the text as generated by TextLayout
can go beyond the bounds of the user-supplied drawing rect and cause the
text to overlap because of the line_rect.intersect(rect) a few lines
below.
We were accidentally calling TextDirection::get_text_direction with a
String instead of a UtfView, which meant each byte was treated as a
codepoint, resulting in incorrect identification of text direction.
There are a few places in the system where this could be useful,
such as PixelPaint and the MandelBrot demo. It seems general enough
that it is probably useful to have it as a system-wide cursor rather
than loading it manually each time.
This can be used immediately in PixelPaint (separate commit), but
I am adding this as a system-wide cursor since it may also be useful
for other applications that want to use it.
Previously there was no way to draw rectangles with any specific
thickness, like we can do with ellises, for instance. This method
is just a simple wrapper around `draw_line()` several times. At
least for now, we don't need to do anything sophisticated since
this will only be used by PixelPaint.`
This allows you to ask the color to recommend either white/black
as a contrasting text color if you were using the color as the
background. This uses the previously added luminosity() method.
Add a new Color category to the Filter menu. Add the Grayscale
filter under Filter->Color to turn the selected layer to grey colors.
Created GrayscaleFilter.h. Modify Filter.h to allow filters
without parameters.
Shades are colors darker than the color, tints are colors lighter.
This is helpful in places where we need a bunch of similar colors
with some small differences.
The common thin-cap button look (1px highlight, 2px shadow) looks nice
on regular buttons, but the scrollbar didn't feel quite right.
This patch adds 1px of offset to the highlight, giving it a thick-cap
look (which I have named Gfx::ButtonStyle::ThickCap) :^)
Non-printable characters should always have a width of 0. This is not
true for some characters like tab, but those can be exempted as the need
arises. Doing this here saves us from a bunch of checks in any place
that needs to figure out glyph widths for text which can contain
non-printable characters.
When entering FastBoxBlurFilter::apply_single_pass(), we VERIFY that the
bitmap format is BGRA8888.
This invariant allows us to use get_pixel<BGRA8888>() instead of the
generic get_pixel() throughout the function. This removes a lot of
branches and makes the filter significantly faster. :^)
The issue was that size_in_bytes() returns size_t, but the buffer used
a size of the unsigned for itself, which only matched on 32-bit
systems and caused an assert error otherwise.
This fixes a crash on drag in FileManager on non 32-bit systems!
LibTTF has a concrete dependency on LibGfx for things like Gfx::Bitmap,
and LibGfx has a concrete dependency in the TTF::Font class in
Gfx::FontDatabase. This circular dependency works fine for Serenity and
Lagom Linux builds of the two libraries. It also works fine for static
library builds on Lagom macOS builds.
However, future changes will make Lagom use shared libraries, and
circular library dependencies are not tolerated in macOS.
This was previously required because the whitespace was consumed and
manually added back after the fact, but now that we preserve whitespace,
this breaks wrapping of text with whitespace after it.
This converts the TextLayout algorithm from handling just words to
handling blocks of strings. With this model, whitespace is preserved
and inserted as-is, rather than being eaten and then replaced with a
single space (or none, if the whitespace was at the start of the word).
Closes#9032.
To transparently support multi-frame images, all decoder plugins have
already been updated to return their only bitmap for frame(0).
This patch completes the remaining cleanup work by removing the
ImageDecoder::bitmap() API and having all clients call frame() instead.
Previously, ImageDecoder::create() would return a NonnullRefPtr and
could not "fail", although the returned decoder may be "invalid" which
you then had to check anyway.
The new interface looks like this:
static RefPtr<Gfx::ImageDecoder> try_create(ReadonlyBytes);
This simplifies ImageDecoder since it no longer has to worry about its
validity. Client code gets slightly clearer as well.
This patch adds a FastBoxBlurFilter to the system. It can be created by
specifying a Bitmap it will work on.
There are two uses implemented:
- apply_single_pass() applys an implementation of a linear-time
box-blur algorithm with the specified radius using a horizontal and a
vertical pass and utilizinga sliding window.
- apply_three_passes() gets a better Gaussian approximation by applying
the filter three times. For this to work the radius of each pass is
calculated to fit Gauss the best.
This class now contains all the fun bits about laying out text in a
rect. It will handle line wrapping at a certain width, cutting off lines
that don't fit the given rect, and handling text elision.
Painter::draw_text now internally uses this.
Future work here would be not laying out text twice (once actually
preparing the lines to be rendered and once to get the bounding box),
and possibly adding left elision if necessary.
Additionally, this commit makes the Utf32View versions of
Painter::draw_text convert to Utf8View internally. The intention is to
completely remove those versions, but they're kept at the moment to keep
the scope of this PR small.
This patch changes the semantics of purgeable memory.
- AnonymousVMObject now has a "purgeable" flag. It can only be set when
constructing the object. (Previously, all anonymous memory was
effectively purgeable.)
- AnonymousVMObject now has a "volatile" flag. It covers the entire
range of physical pages. (Previously, we tracked ranges of volatile
pages, effectively making it a page-level concept.)
- Non-volatile objects maintain a physical page reservation via the
committed pages mechanism, to ensure full coverage for page faults.
- When an object is made volatile, it relinquishes any unused committed
pages immediately. If later made non-volatile again, we then attempt
to make a new committed pages reservation. If this fails, we return
ENOMEM to userspace.
mmap() now creates purgeable objects if passed the MAP_PURGEABLE option
together with MAP_ANONYMOUS. anon_create() memory is always purgeable.
Making a bitmap non-volatile after being volatile may fail to allocate
physical pages after the kernel stole the old pages in a purge.
This is different from the pages being purged, but reallocated. In that
case, they are simply replaced with zero-fill-on-demand pages as if
they were freshly allocated.
This was a really weird thing to begin with, purgeable bitmaps were
basically regular bitmaps without a physical memory reservation.
Since all the clients of this code ended up populating the bitmaps
with pixels immediately after allocating them anyway, there was no
need to avoid the reservation.
Instead, all Gfx::Bitmaps are now purgeable, in the sense that they
can be marked as volatile or non-volatile.
The only difference here is that allocation failure is surfaced when
we try to create the bitmap instead of during the handling of a
subsequent page fault.
