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app: in Luminance mode, replace VLAs with gimp-scratch 

In the Luminance layer-mode, use the scratch allocator for
allocating temporary buffers, instead of using VLAs.
GimpOperationLayerMode already allocates data on the stack,
calculated as not to overflow the stack on any platform, so having
any of its descendants also allocate big buffers on the stack is
risky.
This commit is contained in:
Ell 2018-12-01 05:31:37 -05:00
parent 698d1af798
commit 70b7316ebc
1 changed files with 19 additions and 12 deletions
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31
app/operations/layer-modes/gimpoperationlayermode-blend.c
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@ -32,6 +32,8 @@
#include "../operations-types.h"
#include "core/gimp-scratch.h"
#include "gimpoperationlayermode-blend.h"
@ -866,20 +868,23 @@ gimp_operation_layer_mode_blend_luminance (const gfloat *in,
gfloat *comp,
gint samples)
{
gfloat layer_Y[samples], *layer_Y_p;
gfloat in_Y[samples], *in_Y_p;
gfloat *scratch;
gfloat *in_Y;
gfloat *layer_Y;
scratch = gimp_scratch_new (gfloat, 2 * samples);
in_Y = scratch;
layer_Y = scratch + samples;
babl_process (babl_fish ("RGBA float", "Y float"), layer, layer_Y, samples);
babl_process (babl_fish ("RGBA float", "Y float"), in, in_Y, samples);
layer_Y_p = &layer_Y[0];
in_Y_p = &in_Y[0];
babl_process (babl_fish ("RGBA float", "Y float"), layer, layer_Y, samples);
while (samples--)
{
if (layer[ALPHA] != 0.0f && in[ALPHA] != 0.0f)
{
gfloat ratio = safe_div (layer_Y_p[0], in_Y_p[0]);
gfloat ratio = safe_div (layer_Y[0], in_Y[0]);
gint c;
for (c = 0; c < 3; c ++)
@ -888,12 +893,14 @@ gimp_operation_layer_mode_blend_luminance (const gfloat *in,
comp[ALPHA] = layer[ALPHA];
comp += 4;
in += 4;
layer += 4;
in_Y_p ++;
layer_Y_p ++;
comp += 4;
in += 4;
layer += 4;
in_Y ++;
layer_Y ++;
}
gimp_scratch_free (scratch);
}
void