fb: Fix origin of source picture in fbGlyphs
If a source picture doesn't repeat and a mask format is specified, the
incorrect calulation of the origin of the glyphs caused the glyphs to
not be drawn at all.
Noticed when running gtk-demo from RHEL 6.5 and selecting "Rotated
Text".
Signed-off-by: Peter Harris <email address hidden>
Reviewed-by: Keith Packard <email address hidden>
Signed-off-by: Keith Packard <email address hidden>
/* Test for this bug
cc -std=c99 -o glyph glyph.c `pkg-config --cflags --libs xcb-render`
*/
// 16 x 16 pictfmt_a8 "glyph"
static const char glyph[] = {
0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff,
0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0,
0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0, 0,
0, 0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0,
0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0xff, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0xff, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0, 0,
0, 0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0, 0, 0,
0, 0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0, 0,
0, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0,
0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff,
};
static struct {
uint8_t len;
uint8_t pad[3];
uint16_t deltax, deltay;
uint8_t glyph;
uint8_t pad2[3];
} elt = { len:1, glyph:1, deltax:WIN_SIZE/2 - GLYPH_SIZE/2, deltay:WIN_SIZE/2 - GLYPH_SIZE/2 };
int main(int argc, char *argv[])
{
int screen;
xcb_connection_t *c = xcb_connect(NULL, &screen);
if (!c || xcb_connection_has_error(c)) {
fprintf(stderr, "Cannot open default display \"%s\"\n", getenv("DISPLAY"));
return EXIT_FAILURE;
}
// Find root window and depth
const xcb_setup_t *setup = xcb_get_setup(c);
if (screen >= setup->roots_len)
screen = 0;
xcb_screen_iterator_t si = xcb_setup_roots_iterator(setup);
for (int i=0; i < screen; i++)
xcb_screen_next(&si);
xcb_window_t root = si.data->root;
uint8_t depth = si.data->root_depth;
xcb_visualid_t visual = si.data->root_visual;
// Find picture formats
xcb_render_query_pict_formats_reply_t *qpf;
qpf = xcb_render_query_pict_formats_reply(c, xcb_render_query_pict_formats(c), NULL);
if (!qpf) {
fprintf(stderr, "Cannot query RENDER picture formats\n");
return EXIT_FAILURE;
}
xcb_render_pictformat_t fmt_a8 = 0;
xcb_render_pictforminfo_iterator_t pfi =
xcb_render_query_pict_formats_formats_iterator(qpf);
for (int i = 0; i < xcb_render_query_pict_formats_formats_length(qpf); i++) {
if (pfi.data->depth == 8 &&
pfi.data->type == XCB_RENDER_PICT_TYPE_DIRECT &&
pfi.data->direct.alpha_mask == 0xFF) {
fmt_a8 = pfi.data->id;
break;
}
xcb_render_pictforminfo_next(&pfi);
}
if (!fmt_a8) {
fprintf(stderr, "Cannot find a8 RENDER picture format\n");
return EXIT_FAILURE;
}
xcb_render_pictformat_t fmt_visual = 0;
xcb_render_pictscreen_iterator_t psi =
xcb_render_query_pict_formats_screens_iterator(qpf);
for (int i = 0; i < xcb_render_query_pict_formats_screens_length(qpf); i++) {
xcb_render_pictdepth_iterator_t pdi =
xcb_render_pictscreen_depths_iterator(psi.data);
for (int j = 0; i < xcb_render_pictscreen_depths_length(psi.data); i++) {
xcb_render_pictvisual_iterator_t pvi =
xcb_render_pictdepth_visuals_iterator(pdi.data);
for (int k = 0; k < xcb_render_pictdepth_visuals_length(pdi.data); i++) {
if (pvi.data->visual == visual) {
fmt_visual = pvi.data->format;
goto found_visual;
}
xcb_render_pictvisual_next(&pvi);
}
xcb_render_pictdepth_next(&pdi);
}
xcb_render_pictscreen_next(&psi);
}
found_visual:
if (!fmt_visual) {
fprintf(stderr, "Cannot find visual RENDER picture format\n");
return EXIT_FAILURE;
}
xcb_render_glyphset_t glyphset = xcb_generate_id(c);
xcb_render_create_glyph_set(c, glyphset, fmt_a8);
uint32_t glyph_ids[] = {1};
xcb_render_add_glyphs(c, glyphset, 1, glyph_ids,
&(xcb_render_glyphinfo_t){width:GLYPH_SIZE, height:GLYPH_SIZE}, sizeof(glyph), glyph);
// Create window, pixmap, and gc
xcb_window_t window = xcb_generate_id(c);
uint32_t list[] = { si.data->black_pixel, XCB_EVENT_MASK_EXPOSURE };
xcb_create_window(c, XCB_COPY_FROM_PARENT, window, root, 0, 0, WIN_SIZE, WIN_SIZE,
0, XCB_WINDOW_CLASS_INPUT_OUTPUT, XCB_COPY_FROM_PARENT,
XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK, list);
xcb_map_window(c, window);
xcb_render_picture_t winpic = xcb_generate_id(c);
xcb_render_create_picture(c, winpic, window, fmt_visual, 0, NULL);
xcb_pixmap_t pixmap = xcb_generate_id(c);
xcb_create_pixmap(c, depth, pixmap, window, GLYPH_SIZE, GLYPH_SIZE);
xcb_render_picture_t pixpic = xcb_generate_id(c);
xcb_render_create_picture(c, pixpic, pixmap, fmt_visual, 0, NULL);
xcb_render_fill_rectangles(c, XCB_RENDER_PICT_OP_SRC, pixpic,
(xcb_render_color_t){green:0xFFFF, alpha:0xFFFF}, 1,
&(xcb_rectangle_t){width:GLYPH_SIZE, height:GLYPH_SIZE} );
xcb_flush(c);
for (xcb_generic_event_t *ev = xcb_wait_for_event(c); ev; ev = xcb_wait_for_event(c)) {
int type = ev->response_type;
free(ev);
if (type == XCB_EXPOSE) {
xcb_clear_area(c, 0, window, 0, 0, 0, 0);
xcb_render_composite_glyphs_8(c, XCB_RENDER_PICT_OP_SRC, pixpic, winpic, fmt_a8,
glyphset, 0, 0, sizeof(elt), (uint8_t *)&elt);
xcb_flush(c);
}
}
return EXIT_SUCCESS;
}
(cherry picked from commit 983e30361f49a67252d0b5d82630e70724d69dbf)
