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Merge branch 'read-pixels-roi' into 'master'

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render: Add region of interest to wlr_texture_read_pixels_options

See merge request wlroots/wlroots!4667
This commit is contained in:
Andri Yngvason 2026-01-22 08:55:04 +00:00
commit cff6e5f218
3 changed files with 19 additions and 2 deletions
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2
include/wlr/render/wlr_texture.h
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@ -37,6 +37,8 @@ struct wlr_texture_read_pixels_options {
uint32_t dst_x, dst_y;
/** Source box of the texture to read from. If empty, the full texture is assumed. */
const struct wlr_box src_box;
/** Region of interest within source box. If NULL, the full region is assumed to be of interest. */
struct pixman_region32 *roi;
};
bool wlr_texture_read_pixels(struct wlr_texture *texture,

14
render/gles2/texture.c
View file

@ -214,7 +214,19 @@ static bool gles2_texture_read_pixels(struct wlr_texture *wlr_texture,
// Under these particular conditions, we can read the pixels with only
// one glReadPixels call
glReadPixels(src.x, src.y, src.width, src.height, fmt->gl_format, fmt->gl_type, p);
int y_offset = 0;
int src_height = src.height;
int data_offset = 0;
if (options->roi) {
struct pixman_box32 *ext =
pixman_region32_extents(options->roi);
y_offset = ext->y1;
src_height = ext->y2 - ext->y1;
data_offset = y_offset * options->stride;
}
glReadPixels(src.x, src.y + y_offset, src.width, src_height,
fmt->gl_format, fmt->gl_type, p + data_offset);
} else {
// Unfortunately GLES2 doesn't support GL_PACK_ROW_LENGTH, so we have to read
// the lines out row by row

5
render/pixman/renderer.c
View file

@ -107,9 +107,12 @@ static bool texture_read_pixels(struct wlr_texture *wlr_texture,
pixman_image_t *dst = pixman_image_create_bits_no_clear(fmt,
src.width, src.height, p, options->stride);
if (options->roi) {
pixman_image_set_clip_region32(dst, options->roi);
}
pixman_image_composite32(PIXMAN_OP_SRC, texture->image, NULL, dst,
src.x, src.y, 0, 0, 0, 0, src.width, src.height);
pixman_image_unref(dst);
return true;