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Allow for specifying a sub-region of the source image to use. Downsampling only, currently.

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This commit is contained in:
Jorge Rodriguez
2014-07-31 00:39:33 -07:00
parent 52ac93225a
commit 35cb95b803
2 changed files with 153 additions and 92 deletions
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25
tests/resample_test.cpp
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@ -49,8 +49,8 @@ int main(int argc, char** argv)
return 1;
}
out_w = 256;
out_h = 256;
out_w = 128;
out_h = 128;
out_stride = (out_w + 10) * n;
output_data = (unsigned char*)malloc(out_stride * out_h);
@ -58,7 +58,12 @@ int main(int argc, char** argv)
int in_w = 512;
int in_h = 512;
size_t memory_required = stbr_calculate_memory(in_w, in_h, out_w, out_h, n, STBR_FILTER_CATMULLROM);
float s0 = 0.25f;
float t0 = 0.25f;
float s1 = 0.75f;
float t1 = 0.75f;
size_t memory_required = stbr_calculate_memory(in_w, in_h, out_w, out_h, s0, t0, s1, t1, n, STBR_FILTER_CATMULLROM);
void* extra_memory = malloc(memory_required);
// Cut out the outside 64 pixels all around to test the stride.
@ -86,7 +91,7 @@ int main(int argc, char** argv)
printf("Average: %dms\n", average);
#else
stbr_resize_arbitrary(input_data + w * border * n + border * n, in_w, in_h, w*n, output_data, out_w, out_h, out_stride, n, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB, extra_memory, memory_required);
stbr_resize_arbitrary(input_data + w * border * n + border * n, in_w, in_h, w*n, output_data, out_w, out_h, out_stride, s0, t0, s1, t1, n, STBR_TYPE_UINT8, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, STBR_COLORSPACE_SRGB, extra_memory, memory_required);
#endif
free(extra_memory);
@ -115,10 +120,10 @@ void resize_image(const char* filename, float width_percent, float height_percen
unsigned char* output_data = (unsigned char*)malloc(out_w * out_h * n);
size_t memory_required = stbr_calculate_memory(w, h, out_w, out_h, n, filter);
size_t memory_required = stbr_calculate_memory(w, h, out_w, out_h, 0, 0, 1, 1, n, filter);
void* extra_memory = malloc(memory_required);
stbr_resize_arbitrary(input_data, w, h, 0, output_data, out_w, out_h, 0, n, STBR_TYPE_UINT8, filter, edge, colorspace, extra_memory, memory_required);
stbr_resize_arbitrary(input_data, w, h, 0, output_data, out_w, out_h, 0, 0, 0, 1, 1, n, STBR_TYPE_UINT8, filter, edge, colorspace, extra_memory, memory_required);
free(extra_memory);
stbi_image_free(input_data);
@ -150,9 +155,9 @@ void test_format(const char* file, float width_percent, float height_percent, st
T* output_data = (T*)malloc(new_w * new_h * n * sizeof(T));
size_t required = stbr_calculate_memory(w, h, new_w, new_h, n, STBR_FILTER_CATMULLROM);
size_t required = stbr_calculate_memory(w, h, new_w, new_h, 0, 0, 1, 1, n, STBR_FILTER_CATMULLROM);
void* extra_memory = malloc(required);
stbr_resize_arbitrary(T_data, w, h, 0, output_data, new_w, new_h, 0, n, type, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, colorspace, extra_memory, required);
stbr_resize_arbitrary(T_data, w, h, 0, output_data, new_w, new_h, 0, 0, 0, 1, 1, n, type, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, colorspace, extra_memory, required);
free(extra_memory);
free(T_data);
@ -194,9 +199,9 @@ void test_float(const char* file, float width_percent, float height_percent, stb
float* output_data = (float*)malloc(new_w * new_h * n * sizeof(float));
size_t required = stbr_calculate_memory(w, h, new_w, new_h, n, STBR_FILTER_CATMULLROM);
size_t required = stbr_calculate_memory(w, h, new_w, new_h, 0, 0, 1, 1, n, STBR_FILTER_CATMULLROM);
void* extra_memory = malloc(required);
stbr_resize_arbitrary(T_data, w, h, 0, output_data, new_w, new_h, 0, n, type, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, colorspace, extra_memory, required);
stbr_resize_arbitrary(T_data, w, h, 0, output_data, new_w, new_h, 0, 0, 0, 1, 1, n, type, STBR_FILTER_CATMULLROM, STBR_EDGE_CLAMP, colorspace, extra_memory, required);
free(extra_memory);
free(T_data);