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finish STBI_EDGE_ZERO, untested

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Sean Barrett 2014-08-31 09:32:17 -07:00
parent 9a1d34843e
commit 84520de6c4
1 changed files with 25 additions and 1 deletions
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26
stb_image_resize.h
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@ -595,7 +595,7 @@ static int stbir__edge_wrap_slow(stbir_edge edge, int n, int max)
switch (edge) switch (edge)
{ {
case STBIR_EDGE_ZERO: case STBIR_EDGE_ZERO:
return 0; return 0; // we'll decode the wrong pixel here, and then overwrite with 0s later
case STBIR_EDGE_CLAMP: case STBIR_EDGE_CLAMP:
if (n < 0) if (n < 0)
@ -832,6 +832,16 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
int x = -stbir__get_filter_pixel_margin_horizontal(stbir_info); int x = -stbir__get_filter_pixel_margin_horizontal(stbir_info);
// special handling for STBIR_EDGE_ZERO because it needs to return an item that doesn't appear in the input,
// and we want to avoid paying overhead on every pixel if not STBIR_EDGE_ZERO
if (edge_vertical == STBIR_EDGE_ZERO && (n < 0 || n >= stbir_info->input_h))
{
for (; x < max_x; x++)
for (c = 0; c < channels; c++)
decode_buffer[x*channels + c] = 0;
return;
}
switch (decode) switch (decode)
{ {
case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_LINEAR): case STBIR__DECODE(STBIR_TYPE_UINT8, STBIR_COLORSPACE_LINEAR):
@ -947,6 +957,20 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n)
} }
} }
} }
if (edge_horizontal == STBIR_EDGE_ZERO)
{
for (x = -stbir__get_filter_pixel_margin_horizontal(stbir_info); x < 0; x++)
{
for (c = 0; c < channels; c++)
decode_buffer[x*channels + c] = 0;
}
for (x = input_w; x < max_x; x++)
{
for (c = 0; c < channels; c++)
decode_buffer[x*channels + c] = 0;
}
}
} }
static float* stbir__get_ring_buffer_entry(float* ring_buffer, int index, int ring_buffer_length) static float* stbir__get_ring_buffer_entry(float* ring_buffer, int index, int ring_buffer_length)