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Add screen magnifier
This adds a screen magnifier which can be controlled with the `ZoomIn` / `ZoomOut` and `ToggleMagnify` actions. It scales up part of the rendered framebuffer so the magnification may end up looking blurry depending on the magnification scale. PR #1774
This commit is contained in:
Simon Long
GitHub
parent
ad15c0474d
commit
8ba066a1a5
13 changed files with 473 additions and 1 deletions
302
src/magnifier.c
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302
src/magnifier.c
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// SPDX-License-Identifier: GPL-2.0-only
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#include <assert.h>
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#include <wlr/types/wlr_output.h>
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#include "magnifier.h"
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#include "labwc.h"
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#include "theme.h"
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#include "common/macros.h"
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bool magnify_on;
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double mag_scale = 0.0;
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#define CLAMP(in, lower, upper) MAX(MIN(in, upper), lower)
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void
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magnify(struct output *output, struct wlr_buffer *output_buffer, struct wlr_box *damage)
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{
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int width, height;
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double x, y;
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struct wlr_box border_box, dst_box;
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struct wlr_fbox src_box;
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bool fullscreen = false;
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/* Reuse a single scratch buffer */
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static struct wlr_buffer *tmp_buffer = NULL;
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static struct wlr_texture *tmp_texture = NULL;
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/* TODO: This looks way too complicated to just get the used format */
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struct wlr_drm_format wlr_drm_format = {0};
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struct wlr_shm_attributes shm_attribs = {0};
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struct wlr_dmabuf_attributes dma_attribs = {0};
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if (wlr_buffer_get_dmabuf(output_buffer, &dma_attribs)) {
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wlr_drm_format.format = dma_attribs.format;
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wlr_drm_format.len = 1;
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wlr_drm_format.modifiers = &dma_attribs.modifier;
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} else if (wlr_buffer_get_shm(output_buffer, &shm_attribs)) {
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wlr_drm_format.format = shm_attribs.format;
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} else {
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wlr_log(WLR_ERROR, "Failed to read buffer format");
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return;
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}
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/* Fetch scale-adjusted cursor coordinates */
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struct server *server = output->server;
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struct theme *theme = server->theme;
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struct wlr_cursor *cursor = server->seat.cursor;
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double ox = cursor->x;
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double oy = cursor->y;
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wlr_output_layout_output_coords(server->output_layout, output->wlr_output, &ox, &oy);
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ox *= output->wlr_output->scale;
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oy *= output->wlr_output->scale;
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if (rc.mag_width == -1 || rc.mag_height == -1) {
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fullscreen = true;
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}
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if ((ox < 0 || oy < 0 || ox >= output_buffer->width || oy >= output_buffer->height)
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&& fullscreen) {
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return;
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}
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if (mag_scale == 0.0) {
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mag_scale = rc.mag_scale;
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}
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if (mag_scale == 0.0) {
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mag_scale = 1.0;
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}
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if (fullscreen) {
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width = output_buffer->width;
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height = output_buffer->height;
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x = 0;
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y = 0;
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} else {
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width = rc.mag_width + 1;
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height = rc.mag_height + 1;
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x = ox - (rc.mag_width / 2.0);
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y = oy - (rc.mag_height / 2.0);
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}
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double cropped_width = width;
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double cropped_height = height;
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double dst_x = 0;
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double dst_y = 0;
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/* Ensure everything is kept within output boundaries */
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if (x < 0) {
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cropped_width += x;
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dst_x = x * -1;
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x = 0;
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}
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if (y < 0) {
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cropped_height += y;
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dst_y = y * -1;
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y = 0;
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}
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cropped_width = MIN(cropped_width, (double)output_buffer->width - x);
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cropped_height = MIN(cropped_height, (double)output_buffer->height - y);
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/* (Re)create the temporary buffer if required */
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if (tmp_buffer && (tmp_buffer->width != width || tmp_buffer->height != height)) {
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wlr_log(WLR_DEBUG, "tmp buffer size changed, dropping");
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assert(tmp_texture);
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wlr_texture_destroy(tmp_texture);
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wlr_buffer_drop(tmp_buffer);
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tmp_buffer = NULL;
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tmp_texture = NULL;
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}
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if (!tmp_buffer) {
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tmp_buffer = wlr_allocator_create_buffer(
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server->allocator, width, height, &wlr_drm_format);
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}
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if (!tmp_buffer) {
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wlr_log(WLR_ERROR, "Failed to allocate temporary magnifier buffer");
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return;
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}
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/* Paste the magnified result back into the output buffer */
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if (!tmp_texture) {
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tmp_texture = wlr_texture_from_buffer(server->renderer, tmp_buffer);
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}
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if (!tmp_texture) {
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wlr_log(WLR_ERROR, "Failed to allocate temporary texture");
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wlr_buffer_drop(tmp_buffer);
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tmp_buffer = NULL;
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return;
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}
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/* Extract source region into temporary buffer */
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struct wlr_render_pass *tmp_render_pass = wlr_renderer_begin_buffer_pass(
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server->renderer, tmp_buffer, NULL);
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wlr_buffer_lock(output_buffer);
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struct wlr_texture *output_texture = wlr_texture_from_buffer(
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server->renderer, output_buffer);
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if (!output_texture) {
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goto cleanup;
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}
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struct wlr_render_texture_options opts = {
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.texture = output_texture,
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.src_box = (struct wlr_fbox) {
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x, y, cropped_width, cropped_height },
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.dst_box = (struct wlr_box) {
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dst_x, dst_y, cropped_width, cropped_height },
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.alpha = NULL,
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};
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wlr_render_pass_add_texture(tmp_render_pass, &opts);
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if (!wlr_render_pass_submit(tmp_render_pass)) {
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wlr_log(WLR_ERROR, "Failed to extract magnifier source region");
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wlr_texture_destroy(output_texture);
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goto cleanup;
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}
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wlr_texture_destroy(output_texture);
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/* Render to the output buffer itself */
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tmp_render_pass = wlr_renderer_begin_buffer_pass(
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server->renderer, output_buffer, NULL);
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/* Borders */
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if (fullscreen) {
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border_box.x = 0;
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border_box.y = 0;
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border_box.width = width;
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border_box.height = height;
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} else {
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border_box.x = ox - (width / 2 + theme->mag_border_width);
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border_box.y = oy - (height / 2 + theme->mag_border_width);
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border_box.width = (width + theme->mag_border_width * 2);
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border_box.height = (height + theme->mag_border_width * 2);
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struct wlr_render_rect_options bg_opts = {
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.box = border_box,
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.color = (struct wlr_render_color) {
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.r = theme->mag_border_color[0],
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.g = theme->mag_border_color[1],
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.b = theme->mag_border_color[2],
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.a = theme->mag_border_color[3]
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},
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.clip = NULL,
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};
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wlr_render_pass_add_rect(tmp_render_pass, &bg_opts);
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}
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src_box.width = width / mag_scale;
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src_box.height = height / mag_scale;
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dst_box.width = width;
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dst_box.height = height;
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if (fullscreen) {
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src_box.x = CLAMP(ox - (ox / mag_scale), 0.0,
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width * (mag_scale - 1.0) / mag_scale);
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src_box.y = CLAMP(oy - (oy / mag_scale), 0.0,
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height * (mag_scale - 1.0) / mag_scale);
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dst_box.x = 0;
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dst_box.y = 0;
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} else {
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src_box.x = width * (mag_scale - 1.0) / (2.0 * mag_scale);
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src_box.y = height * (mag_scale - 1.0) / (2.0 * mag_scale);
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dst_box.x = ox - (width / 2);
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dst_box.y = oy - (height / 2);
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}
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opts = (struct wlr_render_texture_options) {
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.texture = tmp_texture,
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.src_box = src_box,
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.dst_box = dst_box,
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.alpha = NULL,
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.clip = NULL,
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.filter_mode = rc.mag_filter ? WLR_SCALE_FILTER_BILINEAR
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: WLR_SCALE_FILTER_NEAREST,
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};
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wlr_render_pass_add_texture(tmp_render_pass, &opts);
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if (!wlr_render_pass_submit(tmp_render_pass)) {
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wlr_log(WLR_ERROR, "Failed to submit render pass");
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goto cleanup;
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}
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/* And finally mark the extra damage */
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*damage = border_box;
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damage->width += 1;
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damage->height += 1;
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cleanup:
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wlr_buffer_unlock(output_buffer);
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}
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bool
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output_wants_magnification(struct output *output)
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{
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static double x = -1;
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static double y = -1;
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struct wlr_cursor *cursor = output->server->seat.cursor;
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if (!magnify_on) {
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x = -1;
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y = -1;
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return false;
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}
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if (cursor->x == x && cursor->y == y) {
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return false;
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}
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x = cursor->x;
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y = cursor->y;
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return output_nearest_to_cursor(output->server) == output;
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}
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/*
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* Toggles magnification on and off
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*/
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void
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magnify_toggle(struct server *server)
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{
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struct output *output = output_nearest_to_cursor(server);
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if (magnify_on) {
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magnify_on = false;
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} else {
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magnify_on = true;
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}
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if (output) {
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wlr_output_schedule_frame(output->wlr_output);
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}
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}
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/*
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* Increases and decreases magnification scale
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*/
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void
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magnify_set_scale(struct server *server, enum magnify_dir dir)
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{
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struct output *output = output_nearest_to_cursor(server);
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if (dir == MAGNIFY_INCREASE) {
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if (magnify_on) {
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mag_scale += rc.mag_increment;
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} else {
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magnify_on = true;
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mag_scale = 1.0 + rc.mag_increment;
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}
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} else {
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if (magnify_on && mag_scale > 1.0 + rc.mag_increment) {
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mag_scale -= rc.mag_increment;
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} else {
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magnify_on = false;
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}
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}
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if (output) {
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wlr_output_schedule_frame(output->wlr_output);
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}
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}
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/*
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* Report whether magnification is enabled
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*/
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bool
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is_magnify_on(void)
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{
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return magnify_on;
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}
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