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colorscale: Refactor creating the hue texture

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Make this a bit shorter and don't call gtk_hsv_to_rgb in the inner
loop as that is unnecessary.
This commit is contained in:
Timm Bäder 2020-09-26 10:12:33 +02:00 committed by Matthias Clasen
parent 769b15c29b
commit 4b8f3e9b92
1 changed files with 15 additions and 19 deletions
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34
gtk/gtkcolorscale.c
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@ -88,39 +88,35 @@ gtk_color_scale_snapshot_trough (GtkColorScale *scale,
{
if (!scale->hue_texture)
{
GdkTexture *texture;
int stride;
const int stride = width * 3;
GBytes *bytes;
guchar *data, *p;
double h;
float r, g, b;
double f;
int hue_x, hue_y;
stride = width * 3;
data = g_malloc (width * height * 3);
data = g_malloc (height * stride);
f = 1.0 / (height - 1);
for (hue_y = 0; hue_y < height; hue_y++)
{
h = CLAMP (hue_y * f, 0.0, 1.0);
const float h = CLAMP ((float)hue_y / (height - 1), 0.0, 1.0);
float r, g, b;
gtk_hsv_to_rgb (h, 1, 1, &r, &g, &b);
p = data + hue_y * stride;
for (hue_x = 0; hue_x < stride; hue_x += 3)
{
gtk_hsv_to_rgb (h, 1, 1, &r, &g, &b);
p[hue_x + 0] = CLAMP (r * 255, 0, 255);
p[hue_x + 1] = CLAMP (g * 255, 0, 255);
p[hue_x + 2] = CLAMP (b * 255, 0, 255);
p[hue_x + 0] = r * 255;
p[hue_x + 1] = g * 255;
p[hue_x + 2] = b * 255;
}
}
bytes = g_bytes_new_take (data, width * height * 3);
texture = gdk_memory_texture_new (width, height,
GDK_MEMORY_R8G8B8,
bytes,
stride);
bytes = g_bytes_new_take (data, height * stride);
scale->hue_texture = gdk_memory_texture_new (width, height,
GDK_MEMORY_R8G8B8,
bytes,
stride);
g_bytes_unref (bytes);
scale->hue_texture = texture;
}
gtk_snapshot_append_texture (snapshot,