mesa: refactor: move _mesa_update_minmax/histogram() into image.c

(cherry picked from commit eded7f010d344a909cf9c403eb3bdad91804d174)

1 files changed, 64 insertions, 3 deletions

diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c
index 3b62eb34ed9..c09cd967cb2 100644
--- a/src/mesa/main/image.c
+++ b/src/mesa/main/image.c
@@ -34,7 +34,6 @@
 #include "context.h"
 #include "image.h"
 #include "imports.h"
-#include "histogram.h"
 #include "macros.h"
 #include "pixel.h"
 
@@ -1431,6 +1430,68 @@ _mesa_scale_and_bias_depth_uint(const GLcontext *ctx, GLuint n,
 }
 
 
+
+/*
+ * Update the min/max values from an array of fragment colors.
+ */
+static void
+update_minmax(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+   GLuint i;
+   for (i = 0; i < n; i++) {
+      /* update mins */
+      if (rgba[i][RCOMP] < ctx->MinMax.Min[RCOMP])
+         ctx->MinMax.Min[RCOMP] = rgba[i][RCOMP];
+      if (rgba[i][GCOMP] < ctx->MinMax.Min[GCOMP])
+         ctx->MinMax.Min[GCOMP] = rgba[i][GCOMP];
+      if (rgba[i][BCOMP] < ctx->MinMax.Min[BCOMP])
+         ctx->MinMax.Min[BCOMP] = rgba[i][BCOMP];
+      if (rgba[i][ACOMP] < ctx->MinMax.Min[ACOMP])
+         ctx->MinMax.Min[ACOMP] = rgba[i][ACOMP];
+
+      /* update maxs */
+      if (rgba[i][RCOMP] > ctx->MinMax.Max[RCOMP])
+         ctx->MinMax.Max[RCOMP] = rgba[i][RCOMP];
+      if (rgba[i][GCOMP] > ctx->MinMax.Max[GCOMP])
+         ctx->MinMax.Max[GCOMP] = rgba[i][GCOMP];
+      if (rgba[i][BCOMP] > ctx->MinMax.Max[BCOMP])
+         ctx->MinMax.Max[BCOMP] = rgba[i][BCOMP];
+      if (rgba[i][ACOMP] > ctx->MinMax.Max[ACOMP])
+         ctx->MinMax.Max[ACOMP] = rgba[i][ACOMP];
+   }
+}
+
+
+/*
+ * Update the histogram values from an array of fragment colors.
+ */
+static void
+update_histogram(GLcontext *ctx, GLuint n, const GLfloat rgba[][4])
+{
+   const GLint max = ctx->Histogram.Width - 1;
+   GLfloat w = (GLfloat) max;
+   GLuint i;
+
+   if (ctx->Histogram.Width == 0)
+      return;
+
+   for (i = 0; i < n; i++) {
+      GLint ri = IROUND(rgba[i][RCOMP] * w);
+      GLint gi = IROUND(rgba[i][GCOMP] * w);
+      GLint bi = IROUND(rgba[i][BCOMP] * w);
+      GLint ai = IROUND(rgba[i][ACOMP] * w);
+      ri = CLAMP(ri, 0, max);
+      gi = CLAMP(gi, 0, max);
+      bi = CLAMP(bi, 0, max);
+      ai = CLAMP(ai, 0, max);
+      ctx->Histogram.Count[ri][RCOMP]++;
+      ctx->Histogram.Count[gi][GCOMP]++;
+      ctx->Histogram.Count[bi][BCOMP]++;
+      ctx->Histogram.Count[ai][ACOMP]++;
+   }
+}
+
+
 /**
  * Apply various pixel transfer operations to an array of RGBA pixels
  * as indicated by the transferOps bitmask
@@ -1486,11 +1547,11 @@ _mesa_apply_rgba_transfer_ops(GLcontext *ctx, GLbitfield transferOps,
    }
    /* update histogram count */
    if (transferOps & IMAGE_HISTOGRAM_BIT) {
-      _mesa_update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
+      update_histogram(ctx, n, (CONST GLfloat (*)[4]) rgba);
    }
    /* update min/max values */
    if (transferOps & IMAGE_MIN_MAX_BIT) {
-      _mesa_update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
+      update_minmax(ctx, n, (CONST GLfloat (*)[4]) rgba);
    }
    /* clamping to [0,1] */
    if (transferOps & IMAGE_CLAMP_BIT) {