mirror of https://github.com/yshui/picom.git
457 lines
16 KiB
C
457 lines
16 KiB
C
// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2018, Yuxuan Shui <yshuiv7@gmail.com>
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#pragma once
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#include <stdbool.h>
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#include "compiler.h"
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#include "config.h"
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#include "driver.h"
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#include "kernel.h"
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#include "region.h"
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#include "types.h"
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#include "x.h"
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typedef struct session session_t;
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struct managed_win;
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struct ev_loop;
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struct backend_operations;
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typedef struct backend_base {
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struct backend_operations *ops;
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struct x_connection *c;
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struct ev_loop *loop;
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/// Whether the backend can accept new render request at the moment
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bool busy;
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// ...
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} backend_t;
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typedef void (*backend_ready_callback_t)(void *);
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// This mimics OpenGL's ARB_robustness extension, which enables detection of GPU context
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// resets.
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// See: https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_robustness.txt, section
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// 2.6 "Graphics Reset Recovery".
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enum device_status {
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DEVICE_STATUS_NORMAL,
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DEVICE_STATUS_RESETTING,
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};
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enum shader_attributes {
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// Whether the shader needs to be render regardless of whether the window is
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// updated.
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SHADER_ATTRIBUTE_ANIMATED = 1,
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};
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struct gaussian_blur_args {
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int size;
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double deviation;
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};
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struct box_blur_args {
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int size;
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};
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struct kernel_blur_args {
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struct conv **kernels;
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int kernel_count;
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};
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struct dual_kawase_blur_args {
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int size;
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int strength;
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};
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typedef struct image_handle {
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// Intentionally left blank
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} *image_handle;
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/// A mask for various backend operations.
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///
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/// The mask is composed of both a mask region and a mask image. The resulting mask
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/// is the intersection of the two. The mask image can be modified by the `corner_radius`
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/// and `inverted` properties. Note these properties have no effect on the mask region.
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struct backend_mask {
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/// Mask image, can be NULL.
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///
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/// Mask image must be an image that was created with the
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/// `BACKEND_IMAGE_FORMAT_MASK` format. Using an image with a wrong format as mask
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/// is undefined behavior.
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image_handle image;
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/// Clip region, in source image's coordinate.
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region_t region;
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/// Corner radius of the mask image, the corners of the mask image will be
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/// rounded.
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double corner_radius;
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/// Origin of the mask image, in the source image's coordinate.
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struct coord origin;
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/// Whether the mask image should be inverted.
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bool inverted;
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};
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struct backend_blur_args {
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/// The blur context
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void *blur_context;
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/// The mask for the blur operation, cannot be NULL.
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struct backend_mask *mask;
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/// Source image
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image_handle source_image;
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/// Opacity of the blurred image
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double opacity;
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};
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struct backend_blit_args {
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/// Source image, can be NULL.
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image_handle source_image;
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/// Mask for the source image. Cannot be NULL.
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struct backend_mask *mask;
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/// Custom shader for this blit operation.
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void *shader;
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/// Opacity of the source image.
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double opacity;
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/// Dim level of the source image.
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double dim;
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/// Brightness limit of the source image. Source image
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/// will be normalized so that the maximum brightness is
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/// this value.
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double max_brightness;
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/// Corner radius of the source image. The corners of
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/// the source image will be rounded.
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double corner_radius;
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/// Effective size of the source image, set where the corners
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/// of the image are.
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int ewidth, eheight;
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/// Border width of the source image. This is used with
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/// `corner_radius` to create a border for the rounded corners.
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/// Setting this has no effect if `corner_radius` is 0.
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int border_width;
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/// Whether the source image should be inverted.
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bool color_inverted;
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};
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enum backend_image_format {
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/// A format that can be used for normal rendering, and binding
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/// X pixmaps.
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/// Images created with `bind_pixmap` have this format automatically.
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BACKEND_IMAGE_FORMAT_PIXMAP,
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/// Like `BACKEND_IMAGE_FORMAT_PIXMAP`, but the image has a higher
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/// precision. Support is optional.
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BACKEND_IMAGE_FORMAT_PIXMAP_HIGH,
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/// A format that can be used for masks.
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BACKEND_IMAGE_FORMAT_MASK,
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};
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enum backend_image_capability {
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/// Image can be sampled from. This is required for `blit` and `blur` source
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/// images. All images except the back buffer should have this capability.
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/// Note that `copy_area` should work without this capability, this is so that
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/// blurring the back buffer could be done.
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BACKEND_IMAGE_CAP_SRC = 1 << 0,
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/// Image can be rendered to. This is required for target images of any operation.
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/// All images except bound X pixmaps should have this capability.
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BACKEND_IMAGE_CAP_DST = 1 << 1,
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};
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enum backend_command_op {
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BACKEND_COMMAND_INVALID = -1,
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BACKEND_COMMAND_BLIT,
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BACKEND_COMMAND_BLUR,
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BACKEND_COMMAND_COPY_AREA,
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};
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/// Symbolic references used as render command source images. The actual `image_handle`
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/// will later be filled in by the renderer using this symbolic reference.
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enum backend_command_source {
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BACKEND_COMMAND_SOURCE_WINDOW,
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BACKEND_COMMAND_SOURCE_SHADOW,
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BACKEND_COMMAND_SOURCE_BACKGROUND,
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};
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// TODO(yshui) might need better names
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struct backend_command {
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enum backend_command_op op;
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struct coord origin;
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enum backend_command_source source;
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union {
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struct {
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struct backend_blit_args blit;
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/// Region of the screen that will be covered by this blit
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/// operations, in screen coordinates.
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region_t opaque_region;
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};
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struct {
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image_handle source_image;
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const region_t *region;
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} copy_area;
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struct backend_blur_args blur;
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};
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/// Mask used for the operation. Note `copy_area` command uses this to store its
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/// `region` argument.
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struct backend_mask mask;
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/// Whether renderer should fill in `mask.image`.
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bool need_mask_image;
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};
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enum backend_quirk {
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/// Backend cannot do blur quickly. The compositor will avoid using blur to create
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/// shadows on this backend
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BACKEND_QUIRK_SLOW_BLUR = 1 << 0,
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};
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struct backend_ops_v2 {
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/// Get backend quirks
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/// @return a bitmask of `enum backend_quirk`.
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uint32_t (*quirks)(struct backend_base *backend_data) attr_nonnull(1);
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/// Check if an optional image format is supported by the backend.
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bool (*is_format_supported)(struct backend_base *backend_data,
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enum backend_image_format format) attr_nonnull(1);
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/// Return the capabilities of an image.
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uint32_t (*image_capabilities)(struct backend_base *backend_data, image_handle image)
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attr_nonnull(1, 2);
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/// Multiply the alpha channel of the target image by a given value.
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///
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/// @param backend_data backend data
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/// @param target an image handle, cannot be NULL.
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/// @param alpha the alpha value to multiply
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/// @param region the region to apply the alpha, in the target image's
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/// coordinate.
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bool (*apply_alpha)(struct backend_base *backend_data, image_handle target,
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double alpha, const region_t *region) attr_nonnull(1, 2, 4);
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/// Copy pixels from a source image on to the target image.
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///
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/// Some effects may be applied. If the region specified by the mask
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/// contains parts that are outside the source image, the source image
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/// will be repeated to fit.
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///
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/// Source and target MUST NOT be the same image.
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///
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/// @param backend_data backend data
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/// @param origin the origin of the operation, in the target image's
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/// coordinate.
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/// @param target an image handle, cannot be NULL.
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/// @param args arguments for blit
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/// @return whether the operation is successful
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bool (*blit)(struct backend_base *backend_data, struct coord origin,
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image_handle target, struct backend_blit_args *args)
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attr_nonnull(1, 3, 4);
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/// Blur a given region of a source image and store the result in the
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/// target image.
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///
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/// The blur operation might access pixels outside the mask region, the
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/// amount of pixels accessed can be queried with `get_blur_size`. If
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/// pixels outside the source image are accessed, the result will be
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/// clamped to the edge of the source image.
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///
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/// Source and target may be the same image.
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///
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/// @param backend_data backend data
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/// @param origin the origin of the operation, in the target image's
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/// coordinate.
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/// @param target an image handle, cannot be NULL.
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/// @param args argument for blur
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/// @return whether the operation is successful
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bool (*blur)(struct backend_base *backend_data, struct coord origin,
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image_handle target, struct backend_blur_args *args)
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attr_nonnull(1, 3, 4);
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/// Direct copy of pixels from a source image on to the target image.
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/// This is a simpler version of `blit`, without any effects. Note unlike `blit`,
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/// if `region` tries to sample from outside the source image, instead of
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/// repeating, the result will be clamped to the edge of the source image.
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/// Blending should not be applied for the copy.
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///
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/// Source and target MUST NOT be the same image.
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///
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/// @param backend_data backend data
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/// @param origin the origin of the operation, in the target image's
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/// coordinate.
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/// @param target an image handle, cannot be NULL.
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/// @param source an image handle, cannot be NULL.
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/// @param region the region to copy, in the source image's coordinate.
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/// @return whether the operation is successful
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bool (*copy_area)(struct backend_base *backend_data, struct coord origin,
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image_handle target, image_handle source, const region_t *region)
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attr_nonnull(1, 3, 4, 5);
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/// Similar to `copy_area`, but is specialized for copying from a higher
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/// precision format to a lower precision format. It has 2 major differences from
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/// `copy_area`:
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///
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/// 1. This function _may_ use dithering when copying from a higher precision
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/// format to a lower precision format. But this is not required.
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/// 2. This function only needs to support copying from an image with the SRC
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/// capability. Unlike `copy_area`, which supports copying from any image.
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///
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/// It's perfectly legal to have this pointing to the same function as
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/// `copy_area`, if the backend doesn't support dithering.
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///
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/// @param backend_data backend data
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/// @param origin the origin of the operation, in the target image's
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/// coordinate.
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/// @param target an image handle, cannot be NULL.
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/// @param source an image handle, cannot be NULL.
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/// @param region the region to copy, in the source image's coordinate.
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/// @return whether the operation is successful
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bool (*copy_area_quantize)(struct backend_base *backend_data, struct coord origin,
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image_handle target, image_handle source,
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const region_t *region) attr_nonnull(1, 3, 4, 5);
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/// Initialize an image with a given color value. If the image has a mask format,
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/// only the alpha channel of the color is used.
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///
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/// @param backend_data backend data
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/// @param target an image handle, cannot be NULL.
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/// @param color the color to fill the image with
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/// @return whether the operation is successful
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bool (*clear)(struct backend_base *backend_data, image_handle target,
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struct color color) attr_nonnull(1, 2);
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/// Create a new, uninitialized image with the given format and size.
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///
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/// @param backend_data backend data
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/// @param format the format of the image
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/// @param size the size of the image
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image_handle (*new_image)(struct backend_base *backend_data,
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enum backend_image_format format, geometry_t size)
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attr_nonnull(1);
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/// Acquire the image handle of the back buffer.
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///
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/// @param backend_data backend data
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image_handle (*back_buffer)(struct backend_base *backend_data);
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/// Bind a X pixmap to the backend's internal image data structure.
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///
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/// @param backend_data backend data
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/// @param pixmap X pixmap to bind
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/// @param fmt information of the pixmap's visual
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/// @return backend specific image handle for the pixmap. May be
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/// NULL.
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image_handle (*bind_pixmap)(struct backend_base *backend_data, xcb_pixmap_t pixmap,
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struct xvisual_info fmt) attr_nonnull(1);
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/// Free resources associated with an image data structure. Releasing the image
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/// returned by `back_buffer` should be a no-op.
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///
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/// @param image the image to be released, cannot be NULL.
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/// @return if this image is created by `bind_pixmap`, the X pixmap; 0
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/// otherwise.
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xcb_pixmap_t (*release_image)(struct backend_base *backend_data, image_handle image)
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attr_nonnull(1, 2);
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/// Present the back buffer to the target window. Ideally the backend should keep
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/// track of the region of the back buffer that has been updated, and use relevant
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/// mechanism (when possible) to present only the updated region.
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bool (*present)(struct backend_base *backend_data) attr_nonnull(1);
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};
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struct backend_operations {
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// =========== V2 ===========
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struct backend_ops_v2 v2;
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// =========== Initialization ===========
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/// Initialize the backend, prepare for rendering to the target window.
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backend_t *(*init)(session_t *, xcb_window_t)attr_nonnull(1);
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void (*deinit)(backend_t *backend_data) attr_nonnull(1);
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/// Called when rendering will be stopped for an unknown amount of
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/// time (e.g. when screen is unredirected). Free some resources.
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///
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/// Optional, not yet used
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void (*pause)(backend_t *backend_data, session_t *ps);
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/// Called before rendering is resumed
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///
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/// Optional, not yet used
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void (*resume)(backend_t *backend_data, session_t *ps);
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/// Called when root window size changed. All existing image data ever
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/// returned by this backend should remain valid after this call
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/// returns.
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///
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/// Optional
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void (*root_change)(backend_t *backend_data, session_t *ps);
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// =========== Rendering ============
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/// Called before when a new frame starts.
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///
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/// Optional
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void (*prepare)(backend_t *backend_data, const region_t *reg_damage);
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// ============ Resource management ===========
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/// Create a shader object from a shader source.
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///
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/// Optional
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void *(*create_shader)(backend_t *backend_data, const char *source)attr_nonnull(1, 2);
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/// Free a shader object.
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///
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/// Required if create_shader is present.
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void (*destroy_shader)(backend_t *backend_data, void *shader) attr_nonnull(1, 2);
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// =========== Query ===========
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/// Get the attributes of a shader.
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///
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/// Optional, Returns a bitmask of attributes, see `shader_attributes`.
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uint64_t (*get_shader_attributes)(backend_t *backend_data, void *shader)
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attr_nonnull(1, 2);
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/// Get the age of the buffer content we are currently rendering on top
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/// of. The buffer that has just been `present`ed has a buffer age of 1.
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/// Every time `present` is called, buffers get older. Return -1 if the
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/// buffer is empty.
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///
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/// Optional
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int (*buffer_age)(backend_t *backend_data);
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/// Get the render time of the last frame. If the render is still in progress,
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/// returns false. The time is returned in `ts`. Frames are delimited by the
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/// present() calls. i.e. after a present() call, last_render_time() should start
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/// reporting the time of the just presented frame.
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///
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/// Optional, if not available, the most conservative estimation will be used.
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bool (*last_render_time)(backend_t *backend_data, struct timespec *ts);
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/// The maximum number buffer_age might return.
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int max_buffer_age;
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// =========== Post-processing ============
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/// Create a blur context that can be used to call `blur` for images with a
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/// specific format.
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void *(*create_blur_context)(backend_t *base, enum blur_method,
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enum backend_image_format format, void *args);
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/// Destroy a blur context
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void (*destroy_blur_context)(backend_t *base, void *ctx);
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/// Get how many pixels outside of the blur area is needed for blur
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void (*get_blur_size)(void *blur_context, int *width, int *height);
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// =========== Misc ============
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/// Return the driver that is been used by the backend
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enum driver (*detect_driver)(backend_t *backend_data);
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void (*diagnostics)(backend_t *backend_data);
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enum device_status (*device_status)(backend_t *backend_data);
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};
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extern struct backend_operations *backend_list[];
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bool backend_execute(struct backend_base *backend, image_handle target, unsigned ncmds,
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struct backend_command cmds[ncmds]);
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void log_backend_command_(enum log_level level, const char *func,
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const struct backend_command *cmd);
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#define log_backend_command(level, cmd) \
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log_backend_command_(LOG_LEVEL_##level, __func__, &(cmd));
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