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https://gitlab.freedesktop.org/wayland/weston
synced 2024-09-06 01:43:43 +00:00
Unpremultiply cairo surface data.
This commit is contained in:
parent
d3fa34ca29
commit
1b2f4390f5
43
flower.c
43
flower.c
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@ -18,16 +18,48 @@
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static const char gem_device[] = "/dev/dri/card0";
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static const char socket_name[] = "\0wayland";
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static void
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unpremultiply_data(uint8_t *data, int width, int height, int stride)
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{
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unsigned int i, j;
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uint8_t *row;
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for (j = 0; j < height; j++) {
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row = data + j * stride;
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for (i = 0; i < width; i++) {
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uint8_t *b = &row[i * 4];
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uint32_t pixel;
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uint8_t alpha;
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memcpy (&pixel, b, sizeof (uint32_t));
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alpha = (pixel & 0xff000000) >> 24;
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if (alpha == 0) {
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b[0] = b[1] = b[2] = b[3] = 0;
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} else {
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b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
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b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
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b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
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b[3] = alpha;
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}
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}
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}
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}
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static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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{
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struct drm_i915_gem_create create;
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struct drm_gem_flink flink;
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struct drm_i915_gem_pwrite pwrite;
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int32_t width, height, stride;
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void *data;
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width = cairo_image_surface_get_width(surface);
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height = cairo_image_surface_get_height(surface);
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stride = cairo_image_surface_get_stride(surface);
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data = cairo_image_surface_get_data(surface);
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unpremultiply_data(data, width, height, stride);
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memset(&create, 0, sizeof(create));
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create.size = height * stride;
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@ -40,8 +72,7 @@ static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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pwrite.handle = create.handle;
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pwrite.offset = 0;
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pwrite.size = height * stride;
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pwrite.data_ptr = (uint64_t) (uintptr_t)
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cairo_image_surface_get_data(surface);
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pwrite.data_ptr = (uint64_t) (uintptr_t) data;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
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fprintf(stderr, "gem pwrite failed: %m\n");
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return 0;
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@ -149,7 +180,7 @@ int main(int argc, char *argv[])
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{
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struct wl_display *display;
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struct wl_surface *surface;
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const int x = 200, y = 200, width = 200, height = 200;
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const int x = 512, y = 384, width = 200, height = 200;
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int fd, i, ret;
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uint32_t name, mask;
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cairo_surface_t *s;
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@ -198,13 +229,13 @@ int main(int argc, char *argv[])
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wl_surface_attach(surface, name, width, height,
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cairo_image_surface_get_stride(s));
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i = 0;
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i = ts.tv_nsec;
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while (ret = poll(p, 2, -1), ret >= 0) {
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if (p[1].revents & POLLIN) {
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read(p[1].fd, &expires, sizeof expires);
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wl_surface_map(surface,
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x + cos(i / 30.0) * 200,
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y + sin(i / 31.0) * 200,
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x + cos(i / 31.0) * 400 - width / 2,
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y + sin(i / 27.0) * 300 - height / 2,
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width, height);
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i++;
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continue;
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37
pointer.c
37
pointer.c
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@ -15,16 +15,48 @@
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static const char gem_device[] = "/dev/dri/card0";
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static const char socket_name[] = "\0wayland";
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static void
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unpremultiply_data(uint8_t *data, int width, int height, int stride)
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{
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unsigned int i, j;
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uint8_t *row;
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for (j = 0; j < height; j++) {
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row = data + j * stride;
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for (i = 0; i < width; i++) {
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uint8_t *b = &row[i * 4];
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uint32_t pixel;
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uint8_t alpha;
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memcpy (&pixel, b, sizeof (uint32_t));
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alpha = (pixel & 0xff000000) >> 24;
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if (alpha == 0) {
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b[0] = b[1] = b[2] = b[3] = 0;
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} else {
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b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
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b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
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b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
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b[3] = alpha;
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}
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}
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}
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}
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static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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{
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struct drm_i915_gem_create create;
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struct drm_gem_flink flink;
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struct drm_i915_gem_pwrite pwrite;
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int32_t width, height, stride;
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void *data;
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width = cairo_image_surface_get_width(surface);
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height = cairo_image_surface_get_height(surface);
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stride = cairo_image_surface_get_stride(surface);
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data = cairo_image_surface_get_data(surface);
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unpremultiply_data(data, width, height, stride);
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memset(&create, 0, sizeof(create));
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create.size = height * stride;
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@ -37,8 +69,7 @@ static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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pwrite.handle = create.handle;
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pwrite.offset = 0;
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pwrite.size = height * stride;
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pwrite.data_ptr = (uint64_t) (uintptr_t)
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cairo_image_surface_get_data(surface);
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pwrite.data_ptr = (uint64_t) (uintptr_t) data;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite) < 0) {
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fprintf(stderr, "gem pwrite failed: %m\n");
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return 0;
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@ -68,7 +99,7 @@ static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
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static void *
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draw_pointer(int width, int height)
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{
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const int d = 2, end = 4, tx = 2, ty = 6, dx = 5, dy = 4;
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const int d = 2, end = 4, tx = 2, ty = 6, dx = 4, dy = 4;
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cairo_surface_t *surface;
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cairo_t *cr;
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