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Fix creation of single pixel buffer to use 32 bits per color channel

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Kovid Goyal
2024-04-04 16:13:28 +05:30
parent 20375ee77a
commit 76999d1a67
1 changed files with 16 additions and 15 deletions
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31
glfw/wl_window.c vendored
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@@ -752,6 +752,7 @@ apply_xdg_configure_changes(_GLFWwindow *window) {
commit_window_surface_if_safe(window); commit_window_surface_if_safe(window);
window->wl.pending_state = 0; window->wl.pending_state = 0;
} }
typedef union pixel { typedef union pixel {
struct { struct {
uint8_t blue, green, red, alpha; uint8_t blue, green, red, alpha;
@@ -761,6 +762,17 @@ typedef union pixel {
static struct wl_buffer* static struct wl_buffer*
create_single_color_buffer(int width, int height, pixel color) { create_single_color_buffer(int width, int height, pixel color) {
// convert to pre-multiplied alpha as that's what wayland wants
if (width == 1 && height == 1 && _glfw.wl.wp_single_pixel_buffer_manager_v1) {
#define C(x) (uint32_t)(((double)((uint64_t)color.alpha * color.x * UINT32_MAX)) / (255 * 255))
struct wl_buffer *ans = wp_single_pixel_buffer_manager_v1_create_u32_rgba_buffer(
_glfw.wl.wp_single_pixel_buffer_manager_v1, C(red), C(green), C(blue), color.alpha * UINT32_MAX);
#undef C
if (!ans) _glfwInputError(GLFW_PLATFORM_ERROR, "Wayland: failed to create single pixel buffer");
return ans;
}
float alpha = color.alpha / 255.f;
color.red = (uint8_t)(alpha * color.red); color.green = (uint8_t)(alpha * color.green); color.blue = (uint8_t)(alpha * color.blue);
int shm_format = color.alpha == 0xff ? WL_SHM_FORMAT_XRGB8888 : WL_SHM_FORMAT_ARGB8888; int shm_format = color.alpha == 0xff ? WL_SHM_FORMAT_XRGB8888 : WL_SHM_FORMAT_ARGB8888;
const size_t size = 4 * width * height; const size_t size = 4 * width * height;
int fd = createAnonymousFile(size); int fd = createAnonymousFile(size);
@@ -769,8 +781,6 @@ create_single_color_buffer(int width, int height, pixel color) {
return NULL; return NULL;
} }
uint32_t *shm_data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); uint32_t *shm_data = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
// convert to pre-multiplied alpha
float alpha = color.alpha / 255.f; color.red = (uint8_t)(alpha * color.red); color.green = (uint8_t)(alpha * color.green); color.blue = (uint8_t)(alpha * color.blue);
if (color.value) for (size_t i = 0; i < size/4; i++) shm_data[i] = color.value; if (color.value) for (size_t i = 0; i < size/4; i++) shm_data[i] = color.value;
else memset(shm_data, 0, size); else memset(shm_data, 0, size);
if (!shm_data) { if (!shm_data) {
@@ -808,26 +818,17 @@ attach_temp_buffer_during_window_creation(_GLFWwindow *window) {
_glfwPlatformGetFramebufferSize(window, &width, &height); _glfwPlatformGetFramebufferSize(window, &width, &height);
if (window->wl.wp_viewport) { if (window->wl.wp_viewport) {
if (_glfw.wl.wp_single_pixel_buffer_manager_v1) { window->wl.temp_buffer_used_during_window_creation = create_single_color_buffer(1, 1, color);
window->wl.temp_buffer_used_during_window_creation = wp_single_pixel_buffer_manager_v1_create_u32_rgba_buffer(_glfw.wl.wp_single_pixel_buffer_manager_v1, color.red, color.green, color.blue, color.alpha);
if (!window->wl.temp_buffer_used_during_window_creation) {
_glfwInputError(GLFW_PLATFORM_ERROR, "Wayland: failed to create single pixel buffer");
return false;
}
} else {
window->wl.temp_buffer_used_during_window_creation = create_single_color_buffer(1, 1, color);
if (!window->wl.temp_buffer_used_during_window_creation) return false;
}
wl_surface_set_buffer_scale(window->wl.surface, 1); wl_surface_set_buffer_scale(window->wl.surface, 1);
wp_viewport_set_destination(window->wl.wp_viewport, window->wl.width, window->wl.height); wp_viewport_set_destination(window->wl.wp_viewport, window->wl.width, window->wl.height);
} else { } else {
window->wl.temp_buffer_used_during_window_creation = create_single_color_buffer(1, 1, color); window->wl.temp_buffer_used_during_window_creation = create_single_color_buffer(width, height, color);
if (!window->wl.temp_buffer_used_during_window_creation) return false;
wl_surface_set_buffer_scale(window->wl.surface, window->wl.fractional_scale ? 1: _glfwWaylandIntegerWindowScale(window)); wl_surface_set_buffer_scale(window->wl.surface, window->wl.fractional_scale ? 1: _glfwWaylandIntegerWindowScale(window));
} }
if (!window->wl.temp_buffer_used_during_window_creation) return false;
wl_surface_attach(window->wl.surface, window->wl.temp_buffer_used_during_window_creation, 0, 0); wl_surface_attach(window->wl.surface, window->wl.temp_buffer_used_during_window_creation, 0, 0);
wl_surface_commit(window->wl.surface); wl_surface_commit(window->wl.surface);
debug("Attached temp buffer during window creation of size: %dx%d\n", width, height); debug("Attached temp buffer during window creation of size: %dx%d and rgba(%u, %u, %u, %u)\n", width, height, color.red, color.green, color.blue, color.alpha);
return true; return true;
} }