[PATCH 2/2] simple-shm: Draw the test motif surrounded by a white border

[Hársszegi Tibor]

Call me lame, but what happens with "small" windows (e.g <20x20)?
________________________________________
Feladó: Rob Bradford [rob at robster.org.uk]
Küldve: 2012. október 2. 19:03
Címzett: wayland-devel at lists.freedesktop.org
Másolatot kap: Rob Bradford
Tárgy: [PATCH 2/2] simple-shm: Draw the test motif surrounded by a white        border

From: Rob Bradford <rob at linux.intel.com>

We can then use a wl_surface_damage to just trigger the compositor to update
just a selected region of the buffer and thus test damaging a sub region.
---
 clients/simple-shm.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/clients/simple-shm.c b/clients/simple-shm.c
index e8dc620..d0aeeb2 100644
--- a/clients/simple-shm.c
+++ b/clients/simple-shm.c
@@ -160,10 +160,10 @@ destroy_window(struct window *window)
 }

 static void
-paint_pixels(void *image, int width, int height, uint32_t time)
+paint_pixels(void *image, int padding, int width, int height, uint32_t time)
 {
-       const int halfh = height / 2;
-       const int halfw = width / 2;
+       const int halfh = padding + (height - padding * 2) / 2;
+       const int halfw = padding + (width  - padding * 2) / 2;
        int ir, or;
        uint32_t *pixel = image;
        int y;
@@ -174,11 +174,13 @@ paint_pixels(void *image, int width, int height, uint32_t time)
        or *= or;
        ir *= ir;

-       for (y = 0; y < height; y++) {
+       pixel += padding * width;
+       for (y = padding; y < height - padding; y++) {
                int x;
                int y2 = (y - halfh) * (y - halfh);

-               for (x = 0; x < width; x++) {
+               pixel += padding;
+               for (x = padding; x < width - padding; x++) {
                        uint32_t v;

                        /* squared distance from center */
@@ -198,6 +200,8 @@ paint_pixels(void *image, int width, int height, uint32_t time)

                        *pixel++ = v;
                }
+
+               pixel += padding;
        }
 }

@@ -208,9 +212,9 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
 {
        struct window *window = data;

-       paint_pixels(window->shm_data, window->width, window->height, time);
+       paint_pixels(window->shm_data, 20, window->width, window->height, time);
        wl_surface_damage(window->surface,
-                         0, 0, window->width, window->height);
+                         20, 20, window->width - 40, window->height - 40);

        if (callback)
                wl_callback_destroy(callback);
@@ -329,7 +333,9 @@ main(int argc, char **argv)
        sigint.sa_flags = SA_RESETHAND;
        sigaction(SIGINT, &sigint, NULL);

+       memset(window->shm_data, 0xff, window->width * window->height * 4);
        wl_surface_attach(window->surface, window->buffer, 0, 0);
+
        redraw(window, NULL, 0);

        while (running)
--
1.7.11.2

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