[shotwell] RGB value lookup

[Jens Georg <jensgeorg src gnome org>]

commit 1d6f2c52db76072472f349e6796c2ad801d2acb0
Author: Jens Georg <mail jensge org>
Date:   Fri Mar 24 22:53:11 2017 +0100

    RGB value lookup
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/ColorTransformation.vala |   66 ++++++++++++++++++++++++++++++++++++++----
 1 files changed, 60 insertions(+), 6 deletions(-)
---
diff --git a/src/ColorTransformation.vala b/src/ColorTransformation.vala
index 43c4841..d1b3fc5 100644
--- a/src/ColorTransformation.vala
+++ b/src/ColorTransformation.vala
@@ -26,9 +26,9 @@ public struct RGBAnalyticPixel {
 
     public RGBAnalyticPixel.from_quantized_components(uchar red_quantized,
         uchar green_quantized, uchar blue_quantized) {
-        this.red = ((float) red_quantized) * INV_255;
-        this.green = ((float) green_quantized) * INV_255;
-        this.blue = ((float) blue_quantized) * INV_255;
+        this.red = rgb_lookup_table[red_quantized];
+        this.green = rgb_lookup_table[green_quantized];
+        this.blue = rgb_lookup_table[blue_quantized];
     }
 
     public RGBAnalyticPixel.from_hsv(HSVAnalyticPixel hsv_pixel) {
@@ -86,9 +86,9 @@ public struct HSVAnalyticPixel {
 
     public HSVAnalyticPixel.from_quantized_components(uchar hue_quantized,
         uchar saturation_quantized, uchar light_value_quantized) {
-        this.hue = ((float) hue_quantized) * INV_255;
-        this.saturation = ((float) saturation_quantized) * INV_255;
-        this.light_value = ((float) light_value_quantized) * INV_255;
+        this.hue = rgb_lookup_table[hue_quantized];
+        this.saturation = rgb_lookup_table[saturation_quantized];
+        this.light_value = rgb_lookup_table[light_value_quantized];
     }
 
     public HSVAnalyticPixel.from_rgb(RGBAnalyticPixel p) {
@@ -1570,3 +1570,57 @@ public PixelTransformationBundle create_auto_enhance_adjustments(Gdk.Pixbuf pixb
 }
 }
 
+const float rgb_lookup_table[] = {
+      0.0f/255.0f,   1.0f/255.0f,   2.0f/255.0f,   3.0f/255.0f,   4.0f/255.0f,
+      5.0f/255.0f,   6.0f/255.0f,   7.0f/255.0f,   8.0f/255.0f,   9.0f/255.0f,
+     10.0f/255.0f,  11.0f/255.0f,  12.0f/255.0f,  13.0f/255.0f,  14.0f/255.0f,
+     15.0f/255.0f,  16.0f/255.0f,  17.0f/255.0f,  18.0f/255.0f,  19.0f/255.0f,
+     20.0f/255.0f,  21.0f/255.0f,  22.0f/255.0f,  23.0f/255.0f,  24.0f/255.0f,
+     25.0f/255.0f,  26.0f/255.0f,  27.0f/255.0f,  28.0f/255.0f,  29.0f/255.0f,
+     30.0f/255.0f,  31.0f/255.0f,  32.0f/255.0f,  33.0f/255.0f,  34.0f/255.0f,
+     35.0f/255.0f,  36.0f/255.0f,  37.0f/255.0f,  38.0f/255.0f,  39.0f/255.0f,
+     40.0f/255.0f,  41.0f/255.0f,  42.0f/255.0f,  43.0f/255.0f,  44.0f/255.0f,
+     45.0f/255.0f,  46.0f/255.0f,  47.0f/255.0f,  48.0f/255.0f,  49.0f/255.0f,
+     50.0f/255.0f,  51.0f/255.0f,  52.0f/255.0f,  53.0f/255.0f,  54.0f/255.0f,
+     55.0f/255.0f,  56.0f/255.0f,  57.0f/255.0f,  58.0f/255.0f,  59.0f/255.0f,
+     60.0f/255.0f,  61.0f/255.0f,  62.0f/255.0f,  63.0f/255.0f,  64.0f/255.0f,
+     65.0f/255.0f,  66.0f/255.0f,  67.0f/255.0f,  68.0f/255.0f,  69.0f/255.0f,
+     70.0f/255.0f,  71.0f/255.0f,  72.0f/255.0f,  73.0f/255.0f,  74.0f/255.0f,
+     75.0f/255.0f,  76.0f/255.0f,  77.0f/255.0f,  78.0f/255.0f,  79.0f/255.0f,
+     80.0f/255.0f,  81.0f/255.0f,  82.0f/255.0f,  83.0f/255.0f,  84.0f/255.0f,
+     85.0f/255.0f,  86.0f/255.0f,  87.0f/255.0f,  88.0f/255.0f,  89.0f/255.0f,
+     90.0f/255.0f,  91.0f/255.0f,  92.0f/255.0f,  93.0f/255.0f,  94.0f/255.0f,
+     95.0f/255.0f,  96.0f/255.0f,  97.0f/255.0f,  98.0f/255.0f,  99.0f/255.0f,
+    100.0f/255.0f, 101.0f/255.0f, 102.0f/255.0f, 103.0f/255.0f, 104.0f/255.0f,
+    105.0f/255.0f, 106.0f/255.0f, 107.0f/255.0f, 108.0f/255.0f, 109.0f/255.0f,
+    110.0f/255.0f, 111.0f/255.0f, 112.0f/255.0f, 113.0f/255.0f, 114.0f/255.0f,
+    115.0f/255.0f, 116.0f/255.0f, 117.0f/255.0f, 118.0f/255.0f, 119.0f/255.0f,
+    120.0f/255.0f, 121.0f/255.0f, 122.0f/255.0f, 123.0f/255.0f, 124.0f/255.0f,
+    125.0f/255.0f, 126.0f/255.0f, 127.0f/255.0f, 128.0f/255.0f, 129.0f/255.0f,
+    130.0f/255.0f, 131.0f/255.0f, 132.0f/255.0f, 133.0f/255.0f, 134.0f/255.0f,
+    135.0f/255.0f, 136.0f/255.0f, 137.0f/255.0f, 138.0f/255.0f, 139.0f/255.0f,
+    140.0f/255.0f, 141.0f/255.0f, 142.0f/255.0f, 143.0f/255.0f, 144.0f/255.0f,
+    145.0f/255.0f, 146.0f/255.0f, 147.0f/255.0f, 148.0f/255.0f, 149.0f/255.0f,
+    150.0f/255.0f, 151.0f/255.0f, 152.0f/255.0f, 153.0f/255.0f, 154.0f/255.0f,
+    155.0f/255.0f, 156.0f/255.0f, 157.0f/255.0f, 158.0f/255.0f, 159.0f/255.0f,
+    160.0f/255.0f, 161.0f/255.0f, 162.0f/255.0f, 163.0f/255.0f, 164.0f/255.0f,
+    165.0f/255.0f, 166.0f/255.0f, 167.0f/255.0f, 168.0f/255.0f, 169.0f/255.0f,
+    170.0f/255.0f, 171.0f/255.0f, 172.0f/255.0f, 173.0f/255.0f, 174.0f/255.0f,
+    175.0f/255.0f, 176.0f/255.0f, 177.0f/255.0f, 178.0f/255.0f, 179.0f/255.0f,
+    180.0f/255.0f, 181.0f/255.0f, 182.0f/255.0f, 183.0f/255.0f, 184.0f/255.0f,
+    185.0f/255.0f, 186.0f/255.0f, 187.0f/255.0f, 188.0f/255.0f, 189.0f/255.0f,
+    190.0f/255.0f, 191.0f/255.0f, 192.0f/255.0f, 193.0f/255.0f, 194.0f/255.0f,
+    195.0f/255.0f, 196.0f/255.0f, 197.0f/255.0f, 198.0f/255.0f, 199.0f/255.0f,
+    200.0f/255.0f, 201.0f/255.0f, 202.0f/255.0f, 203.0f/255.0f, 204.0f/255.0f,
+    205.0f/255.0f, 206.0f/255.0f, 207.0f/255.0f, 208.0f/255.0f, 209.0f/255.0f,
+    210.0f/255.0f, 211.0f/255.0f, 212.0f/255.0f, 213.0f/255.0f, 214.0f/255.0f,
+    215.0f/255.0f, 216.0f/255.0f, 217.0f/255.0f, 218.0f/255.0f, 219.0f/255.0f,
+    220.0f/255.0f, 221.0f/255.0f, 222.0f/255.0f, 223.0f/255.0f, 224.0f/255.0f,
+    225.0f/255.0f, 226.0f/255.0f, 227.0f/255.0f, 228.0f/255.0f, 229.0f/255.0f,
+    230.0f/255.0f, 231.0f/255.0f, 232.0f/255.0f, 233.0f/255.0f, 234.0f/255.0f,
+    235.0f/255.0f, 236.0f/255.0f, 237.0f/255.0f, 238.0f/255.0f, 239.0f/255.0f,
+    240.0f/255.0f, 241.0f/255.0f, 242.0f/255.0f, 243.0f/255.0f, 244.0f/255.0f,
+    245.0f/255.0f, 246.0f/255.0f, 247.0f/255.0f, 248.0f/255.0f, 249.0f/255.0f,
+    250.0f/255.0f, 251.0f/255.0f, 252.0f/255.0f, 253.0f/255.0f, 254.0f/255.0f,
+    255.0f/255.0f,
+};