Eventually we need to allow both pre-multiplied alpha and not, but for now default to premultiplied.
glBindTexture(GL_TEXTURE_2D, sd->texture);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
- glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ /* Assume pre-multiplied alpha for now, this probably
+ * needs to be a wayland visual type of thing. */
+ glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
-static void
-unpremultiply_data(uint8_t *data, int width, int height, int stride)
-{
- unsigned int i, j;
- uint8_t *row;
-
- for (j = 0; j < height; j++) {
- row = data + j * stride;
-
- for (i = 0; i < width; i++) {
- uint8_t *b = &row[i * 4];
- uint32_t pixel;
- uint8_t alpha;
-
- memcpy (&pixel, b, sizeof (uint32_t));
- alpha = (pixel & 0xff000000) >> 24;
- if (alpha == 0) {
- b[0] = b[1] = b[2] = b[3] = 0;
- } else {
- b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
- b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
- b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
- b[3] = alpha;
- }
- }
- }
-}
-
static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
{
struct drm_i915_gem_create create;
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(surface);
- unpremultiply_data(data, width, height, stride);
-
memset(&create, 0, sizeof(create));
create.size = height * stride;
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
-static void
-unpremultiply_data(uint8_t *data, int width, int height, int stride)
-{
- unsigned int i, j;
- uint8_t *row;
-
- for (j = 0; j < height; j++) {
- row = data + j * stride;
-
- for (i = 0; i < width; i++) {
- uint8_t *b = &row[i * 4];
- uint32_t pixel;
- uint8_t alpha;
-
- memcpy (&pixel, b, sizeof (uint32_t));
- alpha = (pixel & 0xff000000) >> 24;
- if (alpha == 0) {
- b[0] = b[1] = b[2] = b[3] = 0;
- } else {
- b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
- b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
- b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
- b[3] = alpha;
- }
- }
- }
-}
-
static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
{
struct drm_i915_gem_create create;
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(surface);
- unpremultiply_data(data, width, height, stride);
-
memset(&create, 0, sizeof(create));
create.size = height * stride;
static const char gem_device[] = "/dev/dri/card0";
static const char socket_name[] = "\0wayland";
-static void
-unpremultiply_data(uint8_t *data, int width, int height, int stride)
-{
- unsigned int i, j;
- uint8_t *row;
-
- for (j = 0; j < height; j++) {
- row = data + j * stride;
-
- for (i = 0; i < width; i++) {
- uint8_t *b = &row[i * 4];
- uint32_t pixel;
- uint8_t alpha;
-
- memcpy (&pixel, b, sizeof (uint32_t));
- alpha = (pixel & 0xff000000) >> 24;
- if (alpha == 0) {
- b[0] = b[1] = b[2] = b[3] = 0;
- } else {
- b[0] = (((pixel & 0xff0000) >> 16) * 255 + alpha / 2) / alpha;
- b[1] = (((pixel & 0x00ff00) >> 8) * 255 + alpha / 2) / alpha;
- b[2] = (((pixel & 0x0000ff) >> 0) * 255 + alpha / 2) / alpha;
- b[3] = alpha;
- }
- }
- }
-}
-
static uint32_t name_cairo_surface(int fd, cairo_surface_t *surface)
{
struct drm_i915_gem_create create;
stride = cairo_image_surface_get_stride(surface);
data = cairo_image_surface_get_data(surface);
- unpremultiply_data(data, width, height, stride);
-
memset(&create, 0, sizeof(create));
create.size = height * stride;