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colorplane: Refactor create_texture()

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Create a R8G8B8 texture here so we don't waste memory and do work for
an alpha channel we don't care about.
This commit is contained in:
Timm Bäder 2020-09-26 09:39:31 +02:00 committed by Matthias Clasen
parent 76e4002226
commit 663ae67935
1 changed files with 24 additions and 33 deletions
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57
gtk/gtkcolorplane.c
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@ -121,50 +121,43 @@ plane_snapshot (GtkWidget *widget,
} }
static void static void
create_texture (GtkColorPlane *plane) create_texture (GtkWidget *widget)
{ {
GtkWidget *widget = GTK_WIDGET (plane); const int width = gtk_widget_get_width (widget);
const int height = gtk_widget_get_height (widget);
const int stride = width * 3;
GtkColorPlane *plane = GTK_COLOR_PLANE (widget);
GBytes *bytes; GBytes *bytes;
int width, height, stride; guint8 *data;
guint red, green, blue;
guint32 *data, *p;
float h, s, v;
float r, g, b;
double sf, vf;
int x, y;
if (!gtk_widget_get_realized (widget)) if (!gtk_widget_get_mapped (widget))
return; return;
width = gtk_widget_get_width (widget);
height = gtk_widget_get_height (widget);
if (width == 0 || height == 0) if (width == 0 || height == 0)
return; return;
g_clear_object (&plane->texture); g_clear_object (&plane->texture);
stride = width * 4;
data = g_malloc (height * stride); data = g_malloc (height * stride);
if (width > 1 && height > 1) if (width > 1 && height > 1)
{ {
h = gtk_adjustment_get_value (plane->h_adj); const float h = gtk_adjustment_get_value (plane->h_adj);
sf = 1.0 / (height - 1); int x, y;
vf = 1.0 / (width - 1);
for (y = 0; y < height; y++) for (y = 0; y < height; y++)
{ {
s = CLAMP (1.0 - y * sf, 0.0, 1.0); const float s = 1.0 - (float)y / (height - 1);
p = data + y * (stride / 4);
for (x = 0; x < width; x++) for (x = 0; x < width; x++)
{ {
v = x * vf; const float v = (float)x / (width - 1);
float r, g, b;
gtk_hsv_to_rgb (h, s, v, &r, &g, &b); gtk_hsv_to_rgb (h, s, v, &r, &g, &b);
red = CLAMP (r * 255, 0, 255);
green = CLAMP (g * 255, 0, 255); data[(y * stride) + (x * 3) + 0] = r * 255;
blue = CLAMP (b * 255, 0, 255); data[(y * stride) + (x * 3) + 1] = g * 255;
p[x] = (0xff << 24) | (red << 16) | (green << 8) | blue; data[(y * stride) + (x * 3) + 2] = b * 255;
} }
} }
} }
@ -175,7 +168,7 @@ create_texture (GtkColorPlane *plane)
bytes = g_bytes_new_take (data, height * stride); bytes = g_bytes_new_take (data, height * stride);
plane->texture = gdk_memory_texture_new (width, height, plane->texture = gdk_memory_texture_new (width, height,
GDK_MEMORY_DEFAULT, GDK_MEMORY_R8G8B8,
bytes, bytes,
stride); stride);
g_bytes_unref (bytes); g_bytes_unref (bytes);
@ -187,9 +180,7 @@ plane_size_allocate (GtkWidget *widget,
int height, int height,
int baseline) int baseline)
{ {
GtkColorPlane *plane = GTK_COLOR_PLANE (widget); create_texture (widget);
create_texture (plane);
} }
static void static void
@ -197,7 +188,7 @@ plane_realize (GtkWidget *widget)
{ {
GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->realize (widget); GTK_WIDGET_CLASS (gtk_color_plane_parent_class)->realize (widget);
create_texture (GTK_COLOR_PLANE (widget)); create_texture (widget);
} }
static void static void
@ -221,10 +212,10 @@ set_cross_cursor (GtkWidget *widget,
} }
static void static void
h_changed (GtkColorPlane *plane) h_changed (GtkWidget *plane)
{ {
create_texture (plane); create_texture (plane);
gtk_widget_queue_draw (GTK_WIDGET (plane)); gtk_widget_queue_draw (plane);
} }
static void static void