Update stb image, update stb image resize

1 files changed, 12 insertions, 9 deletions

diff --git a/external/stb/stb_image_resize.h b/external/stb/stb_image_resize.h
index 8d1b260..c8a2567 100644
--- a/external/stb/stb_image_resize.h
+++ b/external/stb/stb_image_resize.h
@@ -1,4 +1,4 @@
-/* stb_image_resize - v0.96 - public domain image resizing
+/* stb_image_resize - v0.97 - public domain image resizing
    by Jorge L Rodriguez (@VinoBS) - 2014
    http://github.com/nothings/stb
 
@@ -1064,7 +1064,11 @@ static void stbir__calculate_coefficients_upsample(stbir_filter filter, float sc
         total_filter += coefficient_group[i];
     }
 
-    STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(in_last_pixel + 1) + 0.5f - in_center_of_out, 1/scale) == 0);
+    // NOTE(fg): Not actually true in general, nor is there any reason to expect it should be.
+    // It would be true in exact math but is at best approximately true in floating-point math,
+    // and it would not make sense to try and put actual bounds on this here because it depends
+    // on the image aspect ratio which can get pretty extreme.
+    //STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(in_last_pixel + 1) + 0.5f - in_center_of_out, 1/scale) == 0);
 
     STBIR_ASSERT(total_filter > 0.9);
     STBIR_ASSERT(total_filter < 1.1f); // Make sure it's not way off.
@@ -1089,7 +1093,7 @@ static void stbir__calculate_coefficients_downsample(stbir_filter filter, float
 {
     int i;
 
-     STBIR_ASSERT(out_last_pixel - out_first_pixel <= (int)ceil(stbir__filter_info_table[filter].support(scale_ratio) * 2)); // Taken directly from stbir__get_coefficient_width() which we can't call because we don't know if we're horizontal or vertical.
+    STBIR_ASSERT(out_last_pixel - out_first_pixel <= (int)ceil(stbir__filter_info_table[filter].support(scale_ratio) * 2)); // Taken directly from stbir__get_coefficient_width() which we can't call because we don't know if we're horizontal or vertical.
 
     contributor->n0 = out_first_pixel;
     contributor->n1 = out_last_pixel;
@@ -1103,7 +1107,11 @@ static void stbir__calculate_coefficients_downsample(stbir_filter filter, float
         coefficient_group[i] = stbir__filter_info_table[filter].kernel(x, scale_ratio) * scale_ratio;
     }
 
-    STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(out_last_pixel + 1) + 0.5f - out_center_of_in, scale_ratio) == 0);
+    // NOTE(fg): Not actually true in general, nor is there any reason to expect it should be.
+    // It would be true in exact math but is at best approximately true in floating-point math,
+    // and it would not make sense to try and put actual bounds on this here because it depends
+    // on the image aspect ratio which can get pretty extreme.
+    //STBIR_ASSERT(stbir__filter_info_table[filter].kernel((float)(out_last_pixel + 1) + 0.5f - out_center_of_in, scale_ratio) == 0);
 
     for (i = out_last_pixel - out_first_pixel; i >= 0; i--)
     {
@@ -1552,7 +1560,6 @@ static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float
                 {
                     int out_pixel_index = k * 1;
                     float coefficient = horizontal_coefficients[coefficient_group + k - n0];
-                    STBIR_ASSERT(coefficient != 0);
                     output_buffer[out_pixel_index + 0] += decode_buffer[in_pixel_index + 0] * coefficient;
                 }
             }
@@ -1573,7 +1580,6 @@ static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float
                 {
                     int out_pixel_index = k * 2;
                     float coefficient = horizontal_coefficients[coefficient_group + k - n0];
-                    STBIR_ASSERT(coefficient != 0);
                     output_buffer[out_pixel_index + 0] += decode_buffer[in_pixel_index + 0] * coefficient;
                     output_buffer[out_pixel_index + 1] += decode_buffer[in_pixel_index + 1] * coefficient;
                 }
@@ -1595,7 +1601,6 @@ static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float
                 {
                     int out_pixel_index = k * 3;
                     float coefficient = horizontal_coefficients[coefficient_group + k - n0];
-                    STBIR_ASSERT(coefficient != 0);
                     output_buffer[out_pixel_index + 0] += decode_buffer[in_pixel_index + 0] * coefficient;
                     output_buffer[out_pixel_index + 1] += decode_buffer[in_pixel_index + 1] * coefficient;
                     output_buffer[out_pixel_index + 2] += decode_buffer[in_pixel_index + 2] * coefficient;
@@ -1618,7 +1623,6 @@ static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float
                 {
                     int out_pixel_index = k * 4;
                     float coefficient = horizontal_coefficients[coefficient_group + k - n0];
-                    STBIR_ASSERT(coefficient != 0);
                     output_buffer[out_pixel_index + 0] += decode_buffer[in_pixel_index + 0] * coefficient;
                     output_buffer[out_pixel_index + 1] += decode_buffer[in_pixel_index + 1] * coefficient;
                     output_buffer[out_pixel_index + 2] += decode_buffer[in_pixel_index + 2] * coefficient;
@@ -1643,7 +1647,6 @@ static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float
                     int c;
                     int out_pixel_index = k * channels;
                     float coefficient = horizontal_coefficients[coefficient_group + k - n0];
-                    STBIR_ASSERT(coefficient != 0);
                     for (c = 0; c < channels; c++)
                         output_buffer[out_pixel_index + c] += decode_buffer[in_pixel_index + c] * coefficient;
                 }