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Some error conditions.

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Jorge Rodriguez 2014-07-31 00:52:03 -07:00
parent 35cb95b803
commit 1b2d104e00
1 changed files with 20 additions and 3 deletions
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23
stb_resample.h
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@ -43,7 +43,7 @@
// //
// input_data is your supplied texels. // input_data is your supplied texels.
// output_data will be the resized texels. It should be of size output_w * output_h * channels // output_data will be the resized texels. It should be of size output_w * output_h * channels
// Returned result is 1 for success or 0 in case of an error. Currently the only error is failure to allocate memory. // Returned result is 1 for success or 0 in case of an error. In the case of an error an assert with be triggered, #define STBR_ASSERT() to see it.
// If you're unsure of which filter to use, Catmull-Rom is a good upsampling filter and Mitchell is a good downsampling filter. // If you're unsure of which filter to use, Catmull-Rom is a good upsampling filter and Mitchell is a good downsampling filter.
@ -59,7 +59,7 @@
// //
// input_stride_in_bytes and output_stride_in_bytes can be 0. If so they will be automatically calculated as width * channels. // input_stride_in_bytes and output_stride_in_bytes can be 0. If so they will be automatically calculated as width * channels.
// s0, t0, s1, t1 are the top-left and bottom right corner (uv addressing style: [0, 1]x[0, 1]) of a region of the input image to use. // s0, t0, s1, t1 are the top-left and bottom right corner (uv addressing style: [0, 1]x[0, 1]) of a region of the input image to use.
// Returned result is 1 for success or 0 in case of an error. Currently the only error is that the memory passed in is insufficient. // Returned result is 1 for success or 0 in case of an error. In the case of an error an assert with be triggered, #define STBR_ASSERT() to see it.
// stbr_resize_arbitrary() will not allocate any memory, it will use the memory you pass in to do its work. // stbr_resize_arbitrary() will not allocate any memory, it will use the memory you pass in to do its work.
@ -1230,6 +1230,8 @@ STBRDEF int stbr_resize_arbitrary(const void* input_data, int input_w, int input
int channels, stbr_type type, stbr_filter filter, stbr_edge edge, stbr_colorspace colorspace, int channels, stbr_type type, stbr_filter filter, stbr_edge edge, stbr_colorspace colorspace,
void* tempmem, stbr_size_t tempmem_size_in_bytes) void* tempmem, stbr_size_t tempmem_size_in_bytes)
{ {
stbr_size_t memory_required = stbr_calculate_memory(input_w, input_h, output_w, output_h, s0, t0, s1, t1, channels, filter);
int width_stride_input = input_stride_in_bytes ? input_stride_in_bytes : channels * input_w * stbr__type_size[type]; int width_stride_input = input_stride_in_bytes ? input_stride_in_bytes : channels * input_w * stbr__type_size[type];
int width_stride_output = output_stride_in_bytes ? output_stride_in_bytes : channels * output_w * stbr__type_size[type]; int width_stride_output = output_stride_in_bytes ? output_stride_in_bytes : channels * output_w * stbr__type_size[type];
@ -1250,13 +1252,28 @@ STBRDEF int stbr_resize_arbitrary(const void* input_data, int input_w, int input
STBR_ASSERT(filter != 0); STBR_ASSERT(filter != 0);
STBR_ASSERT(filter < STBR_ARRAY_SIZE(stbr__filter_info_table)); STBR_ASSERT(filter < STBR_ARRAY_SIZE(stbr__filter_info_table));
if (!filter || filter >= STBR_ARRAY_SIZE(stbr__filter_info_table))
return 0;
STBR_ASSERT(s1 > s0); STBR_ASSERT(s1 > s0);
STBR_ASSERT(t1 > t0); STBR_ASSERT(t1 > t0);
if (s1 <= s0 || t1 <= t0)
return 0;
STBR_ASSERT(s1 <= 1 && s0 >= 0 && t1 <= 1 && t0 >= 0);
if (s1 > 1 || s0 < 0 || t1 > 1 || t0 < 0)
return 0;
STBR_ASSERT(tempmem);
if (!tempmem) if (!tempmem)
return 0; return 0;
if (tempmem_size_in_bytes < stbr_calculate_memory(input_w, input_h, output_w, output_h, s0, t0, s1, t1, channels, filter)) STBR_ASSERT(tempmem_size_in_bytes >= memory_required);
if (tempmem_size_in_bytes < memory_required)
return 0; return 0;
memset(tempmem, 0, tempmem_size_in_bytes); memset(tempmem, 0, tempmem_size_in_bytes);