This adds support for nearest neighbor filtering,
which can be useful in quite a few scenarios.
img := paint.NewImageOp(m)
img.Filter = paint.FilterNearest
img.Add(gtx.Ops)
Fixes: https://todo.sr.ht/~eliasnaur/gio/414
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
The double-negative DisabledOp is harder to understand than a
straightforward EnabledOp. Note that the absence of an EnabledOp
implies still means that the widget is enabled.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
When storing a string in an interface value that escapes, Go has to heap
allocate space for the string header, as interface values can only store
pointers. In text-heavy applications, this can lead to hundreds of
allocations per frame due to semantic.LabelOp, the primary user of
string-typed references in ops.
Instead of allocating each string header individually, provide a slice
of strings to store string-typed references in, and store pointers into
this slice as the actual references. This only allocates when resizing
the slice's backing array, and averages out to no allocations, as the
backing array gets reused between calls to Ops.Reset.
We introduce two new functions, Write1String and Write2String, which
make use of this new slice for their last argument. We could've
automated this in the existing Write1 and Write2 methods, but that would
require type assertions on each call, and the vast majority of ops do
not make use of strings.
Signed-off-by: Dominik Honnef <dominik@honnef.co>
Using clean struct creation creates a lot of temporary variables in
assembly. Inline the assignments, which generates less code.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
Size and NumRefs are always used together, so consolidate info to
a single table to avoid two separate lookups.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
The app.Window.Perform(ActionMove) is the wrong abstraction for
initiating a move gesture: Windows needs to know the move gesture
area at pointer move, and macOS needs to know the pointer button
down event that triggers the move gesture. This change replaces
Perform(ActionMove) with a new system.ActionInputOp that marks an
area movable.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Before this change, every Event would be passed to the focused InputOp
tag, making it impossible to implement, say, program-wide shortcuts.
This change implements key.Event routing similar to how pointer.Events
are routed: every InputOp describes the set of keys it can handle, and
the router use that information to deliver an Event to the matching
handler.
This is an API change, because every InputOp must now include a filter
matching the keys it wants to handle.
Fixes: https://todo.sr.ht/~eliasnaur/gio/395
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Add most of the common cursors defined by different systems.
Normalize cursor names to match CSS.
This is API change: some cursor names have changed, and the
underlying type is no longer a string.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
This change implements reporting of the caret position from Editor, as well
as Windows, macOS, Android support. As a result, the IME composition window
on Windows and macOS is now positioned correctly.
References: https://todo.sr.ht/~eliasnaur/gio/246
Signed-off-by: Elias Naur <mail@eliasnaur.com>
A recorded macro is prefixed with an internal macro op that stores
the end of the macro. The end is used to efficiently skip the macro
when not calling it. The call a macro, the CallOp stores the start
position of the macro.
To support seamless wrapping of Ops lists, this change removes the
dependency on the macro op prefix from CallOp. Internal code can
now call an Ops like this:
var ops op.Ops
var wrapper op.Ops
ops.AddCall(&wrapper.Internal, &ops.Internal, ops.PC{}, ops.PCFor(&ops.Internal))
References: https://todo.sr.ht/~eliasnaur/gio/318
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Remove unnecessary fill when starting a recording in op.Record.
Have the exact number of possible stack kinds in ops.Ops.
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
Multiple operations Op, such as clip.Path, cannot
be interleaved with other ops. This patch adds a
mechanism to ensure that is the case by starting
multi ops with ops.BeginMulti and ending them with
ops.EndMulti while operations are written to op.Ops
with ops.WriteMulti.
This mechanism is applied to clip.Path.
Fixes: https://todo.sr.ht/~eliasnaur/gio/336
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
This patch adds internal Drag and Drop support to app.Windows.
The new package io/transfer adds the ability to
define draggable and droppable targets, which
are leveraged by the new widget.Draggable type.
The API is generic and could handle future use
cases, such as external Drag and Drop.
Updates gio#153
Signed-off-by: Pierre Curto <pierre.curto@gmail.com>
Software such as screen readers require semantic descriptions of user
interfaces to effectively present and interact with them. Package
semantic, combined with the existing package clip provide the operations
for Gio programs to describe themselves.
This change implements the semantic package and the routing changes for
accessing semantic trees; follow-ups add semantic information to widgets
and implement mapping semantic tree to platform representations.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Pointer hit areas and paint clip areas are separate concepts, but
similar enough to warrant merging. This change replaces pointer hit
areas with clip areas, so Gio is left with just one area concept (in
package op/clip).
The reason for separating the concepts in the original Gio release was
because of my being unsure general path/stroke hit areas would ever be
implemented, let alone efficient.
This change represents a change of mind, in the sense that it's better
to have an incomplete API than two separate area concepts.
Leave the deprecated pointer.Rect, pointer.Ellipse for temporary
backwards compatibility.
This is an API change. Most existing programs should continue to build
with this change, but may have to adjust to having all clip.Ops participate
in InputOp hit areas.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
We're about to use clip.Ops for pointer areas; this change makes the
decoding accessible from the router package.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
The Add method was a compatibility stop-gap.
API change. Use clip.Op.Push and Pop the return value to explicitly mark
the region affected by the clip operation.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Ops is in the internal package ops, but external clients can reach its
method through op.Ops.Internal. Hide them by converting them to internal
package functions.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
A previous change merged PassOp with AreaOp under the assumption that
the pass mode would be set on a particular area. That assumption turns
out not to hold, so this change brings back PassOp as an independent
stack operation.
This is an API change: replace AreaOp{Pass: true} with a separate
pointer.PassOp operation.
Fixes gio#288
Signed-off-by: Elias Naur <mail@eliasnaur.com>
The op.Save and Load methods exist to support the need for
transformation, clip, pointer area state to behave as stacks. For
example, layout needs to apply an offset to its children but not
subsequent operations.
Before this change, op.Save and Load were used to save and restore the
state:
ops := new(op.Ops)
// Save state.
state := op.Save(ops)
// Apply offset.
op.Offset(...).Add(ops)
// Draw with offset applied.
draw(ops)
// Restore state.
state.Load()
A drawback with the op.Save mechanism is that there is no direct
connection between the state change and the saving and loading of state.
This causes confusion as to when a Save/Load is needed and who is
responsible for performing them, which leads to subtle bugs and over-use
of Save/Loads.
This change gets rid of the general state stack and replaces it with
per-state stacks. There is now a stack for transformation, clip, pointer
areas, and they can only be restored by the code pushing state to them.
The example above now becomes:
ops := new(op.Ops)
// Push offset to the transformation stack.
stack := op.Offset(...).Push(ops)
// Draw with offset applied.
draw(ops)
// Restore state.
stack.Pop()
For convenience, transformation also be Add'ed if the stack operation is
not required.
Simple state such as the current material no longer has a way to be
restored; it is assumed the client of a PaintOp adds their desired
material operation before it.
API change: replace op.Save/Load with explicit Push/Pop scopes for
op.TransformOps, pointer.AreaOps, clip.Ops.
To ease porting, this change retains a version of op.Save/Load that
saves and restores the transformation and clip stacks. It also retains
an Add method for clip.Op.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Since clip.Path now encodes paths in the format expected by
elements.comp, use that data directly instead of a roundtrip through
drawOps.buildVerts.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
We're about to let clip.Path use more of the compute renderer features
(lines, cubic béziers). This change prepares the gpu package for reading
one of several commands types, not just the quadratic béziers of before.
The old Quad type is still the basis for the stroking algorithms, but
this change moves it into package gpu which is the only user.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
It turns out restoring all operation state from the moment Defer
is executed is too much; for example, a right-click pop-up needs
the transformation, but not the current clip.
Change Defer to only restore the transformation, and reset all
other state.
Other combinations may be needed in future; we'll deal with them then,
possibly by exposing the load state mask.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Push/Pop only allows saving and restoring operation state in a
stack-like manner. We're going to need restoring arbitrary state
for implementing deferred operations.
Generalize state save/restore and implement Push and Pop on top of
that.
Signed-off-by: Elias Naur <mail@eliasnaur.com>
Currently BCE is unable to understand that the accesses in the code are
safe. Added an explicit slice to make the length bounds obvious.
Signed-off-by: Egon Elbre <egonelbre@gmail.com>
Add support for affine transformations. The key changes are outlined
below.
- Painting/clipping with rectangles is handled by, for complex
transforms, creating clipping paths representing the transformed
rectangle and using a larger bounding box. Cover/Blit shaders updated
correspondingly to correctly map texture cordinates from the new
bounding boxes.
- Since path splitting must happen on CPU the transforms must happen CPU
side as well - offsets removed from shaders.
- Complex transforms will lead to different path splitting which means
that GPU arrays can no longer be cached if the transform has changed.
Thus the current transform is added as a key to the cache.
- Add a public API to op for setting Affine transformations.
There are a number of optimizations that could be explored further but
which are left out now:
- Caching also of CPU operations (e.g path splitting & transforms) and
not only caching the GPU arrays.
- Allow for re-use of cached GPU vertices if the transformation change
is a pure offset / scaling since the splitting is then the same.
Signed-off-by: Viktor <viktor.ogeman@gmail.com>
Encode TransformOp as an Affince2D matrix instead and use that in gpu and io transform handling.
There are no changes to user facing API and so far only the offset part of the matrix is used.
This patch is a step towards full affine transformations.
Signed-off-by: Viktor <viktor.ogeman@gmail.com>
This is a first step towards supporting affine drawing transforms.
The rendering algorithm relies on quadratic curves that do not cross
x = 0 more than once, thus curves must be split after any rotation/shear
transforms. Move this logic and the generation of vertices to package gpu.
Also close all curves and draw zero-width edges as preparation for
transform since the will no longer implicitly be vertical with no
effect.
This commit will severely affect performance since vertexes are now
transformed also for cached items, using cpu resources.
Signed-off-by: Viktor <viktor.ogeman@gmail.com>
Egon Elbre