diff options
Diffstat (limited to 'src/mesa/main/image.c')
| -rw-r--r-- | src/mesa/main/image.c | 67 |
1 files changed, 64 insertions, 3 deletions
diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c index 63bcc48e68..a6ac821251 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) { |