diff options
| author | Marc-André Lureau <marcandre.lureau@redhat.com> | 2023-06-06 15:56:51 +0400 |
|---|---|---|
| committer | Marc-André Lureau <marcandre.lureau@redhat.com> | 2023-06-27 17:08:56 +0200 |
| commit | da9eb580b7e28d70d344bb03e0fe5703c8d1892c (patch) | |
| tree | 5964d330aafbb191cbbb9b86566f62725d4009ca /ui/egl-helpers.c | |
| parent | afe8e0b6db2debeaf35f5bd43efa1ada90ba0847 (diff) | |
ui: add egl_fb_read_rect()
Similar to egl_fb_read(), same limitations, but with extra arguments to
read a subset of the framebuffer. Used in following commits.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230606115658.677673-15-marcandre.lureau@redhat.com>
Diffstat (limited to 'ui/egl-helpers.c')
| -rw-r--r-- | ui/egl-helpers.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/ui/egl-helpers.c b/ui/egl-helpers.c index c2a3ace743..f38800e920 100644 --- a/ui/egl-helpers.c +++ b/ui/egl-helpers.c @@ -169,6 +169,20 @@ void egl_fb_read(DisplaySurface *dst, egl_fb *src) GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst)); } +void egl_fb_read_rect(DisplaySurface *dst, egl_fb *src, int x, int y, int w, int h) +{ + assert(surface_width(dst) == src->width); + assert(surface_height(dst) == src->height); + assert(surface_format(dst) == PIXMAN_x8r8g8b8); + + glBindFramebuffer(GL_READ_FRAMEBUFFER, src->framebuffer); + glReadBuffer(GL_COLOR_ATTACHMENT0_EXT); + glPixelStorei(GL_PACK_ROW_LENGTH, surface_stride(dst) / 4); + glReadPixels(x, y, w, h, + GL_BGRA, GL_UNSIGNED_BYTE, surface_data(dst) + x * 4); + glPixelStorei(GL_PACK_ROW_LENGTH, 0); +} + void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip) { glBindFramebuffer(GL_FRAMEBUFFER_EXT, dst->framebuffer); |