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ui: add egl_fb_read_rect()

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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>
This commit is contained in:
Marc-André Lureau 2023-06-06 15:56:51 +04:00
parent afe8e0b6db
commit da9eb580b7
2 changed files with 15 additions and 0 deletions
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1
include/ui/egl-helpers.h
View File

@ -31,6 +31,7 @@ void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
void egl_fb_setup_new_tex(egl_fb *fb, int width, int height);
void egl_fb_blit(egl_fb *dst, egl_fb *src, bool flip);
void egl_fb_read(DisplaySurface *dst, egl_fb *src);
void egl_fb_read_rect(DisplaySurface *dst, egl_fb *src, int x, int y, int w, int h);
void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip);
void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,

14
ui/egl-helpers.c
View File

@ -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);