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@ -1,4 +1,4 @@ |
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/* stb_image_resize - v0.92 - public domain image resizing |
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/* stb_image_resize - v0.94 - public domain image resizing |
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by Jorge L Rodriguez (@VinoBS) - 2014 |
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http://github.com/nothings/stb |
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@ -107,8 +107,8 @@ |
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industry, it is still uncommon in the videogame/real-time world. |
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If you linearly filter non-premultiplied alpha, strange effects |
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occur. (For example, the average of 1% opaque bright green |
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and 99% opaque black produces 50% transparent dark green when |
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occur. (For example, the mi">50/50 average of 99% transparent bright green |
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and 1% transparent black produces 50% transparent dark green when |
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non-premultiplied, whereas premultiplied it produces 50% |
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transparent near-black. The former introduces green energy |
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that doesn't exist in the source image.) |
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@ -152,20 +152,20 @@ |
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(For example, graphics hardware does not apply sRGB conversion |
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to the alpha channel.) |
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ADDITIONAL CONTRIBUTORS |
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CONTRIBUTORS |
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Jorge L Rodriguez: Implementation |
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Sean Barrett: API design, optimizations |
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Aras Pranckevicius: bugfix |
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REVISIONS |
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0.94 (2017-03-18) fixed warnings |
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0.93 (2017-03-03) fixed bug with certain combinations of heights |
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0.92 (2017-01-02) fix integer overflow on large (>2GB) images |
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0.91 (2016-04-02) fix warnings; fix handling of subpixel regions |
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0.90 (2014-09-17) first released version |
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LICENSE |
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This software is dual-licensed to the public domain and under the following |
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license: you are granted a perpetual, irrevocable license to copy, modify, |
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publish, and distribute this file as you see fit. |
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See end of file for license information. |
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TODO |
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Don't decode all of the image data when only processing a partial tile |
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@ -533,10 +533,11 @@ typedef struct |
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int horizontal_num_contributors; |
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int vertical_num_contributors; |
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int ring_buffer_length_bytes; // The length of an individual entry in the ring buffer. The total number of ring buffers is stbir__get_filter_pixel_width(filter) |
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int ring_buffer_length_bytes; // The length of an individual entry in the ring buffer. The total number of ring buffers is stbir__get_filter_pixel_width(filter) |
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int ring_buffer_num_entries; // Total number of entries in the ring buffer. |
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int ring_buffer_first_scanline; |
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int ring_buffer_last_scanline; |
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int ring_buffer_begin_index; |
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int ring_buffer_begin_index; // first_scanline is at this index in the ring buffer |
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float* ring_buffer; |
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float* encode_buffer; // A temporary buffer to store floats so we don't lose precision while we do multiply-adds. |
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@ -551,16 +552,17 @@ typedef struct |
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int encode_buffer_size; |
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} stbir__info; |
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static const float stbir__max_uint8_as_float = 255.0f; |
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static const float stbir__max_uint16_as_float = 65535.0f; |
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static const double stbir__max_uint32_as_float = 4294967295.0; |
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static stbir__inline int stbir__min(int a, int b) |
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{ |
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return a < b ? a : b; |
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} |
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static stbir__inline int stbir__max(int a, int b) |
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{ |
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return a > b ? a : b; |
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} |
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static stbir__inline float stbir__saturate(float x) |
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{ |
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if (x < 0) |
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@ -1027,7 +1029,7 @@ static void stbir__calculate_sample_range_downsample(int n, float in_pixels_radi |
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*out_last_pixel = (int)(floor(out_pixel_influence_upperbound - 0.5)); |
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} |
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static void stbir__calculate_coefficients_upsample(stbir__info* stbir_info, stbir_filter filter, float scale, int in_first_pixel, int in_last_pixel, float in_center_of_out, stbir__contributors* contributor, float* coefficient_group) |
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static void stbir__calculate_coefficients_upsample(stbir_filter filter, float scale, int in_first_pixel, int in_last_pixel, float in_center_of_out, stbir__contributors* contributor, float* coefficient_group) |
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{ |
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int i; |
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float total_filter = 0; |
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@ -1077,7 +1079,7 @@ static void stbir__calculate_coefficients_upsample(stbir__info* stbir_info, stbi |
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} |
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} |
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static void stbir__calculate_coefficients_downsample(stbir__info* stbir_info, stbir_filter filter, float scale_ratio, int out_first_pixel, int out_last_pixel, float out_center_of_in, stbir__contributors* contributor, float* coefficient_group) |
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static void stbir__calculate_coefficients_downsample(stbir_filter filter, float scale_ratio, int out_first_pixel, int out_last_pixel, float out_center_of_in, stbir__contributors* contributor, float* coefficient_group) |
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{ |
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int i; |
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@ -1107,7 +1109,7 @@ static void stbir__calculate_coefficients_downsample(stbir__info* stbir_info, st |
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} |
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} |
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static void stbir__normalize_downsample_coefficients(stbir__info* stbir_info, stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size) |
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static void stbir__normalize_downsample_coefficients(stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, int input_size, int output_size) |
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{ |
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int num_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size); |
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int num_coefficients = stbir__get_coefficient_width(filter, scale_ratio); |
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@ -1184,7 +1186,7 @@ static void stbir__normalize_downsample_coefficients(stbir__info* stbir_info, st |
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// Each scan line uses the same kernel values so we should calculate the kernel |
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// values once and then we can use them for every scan line. |
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static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size) |
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static void stbir__calculate_filters(stbir__contributors* contributors, float* coefficients, stbir_filter filter, float scale_ratio, float shift, int input_size, int output_size) |
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{ |
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int n; |
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int total_contributors = stbir__get_contributors(scale_ratio, filter, input_size, output_size); |
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@ -1201,7 +1203,7 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor |
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stbir__calculate_sample_range_upsample(n, out_pixels_radius, scale_ratio, shift, &in_first_pixel, &in_last_pixel, &in_center_of_out); |
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stbir__calculate_coefficients_upsample(stbir_info, filter, scale_ratio, in_first_pixel, in_last_pixel, in_center_of_out, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); |
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stbir__calculate_coefficients_upsample(filter, scale_ratio, in_first_pixel, in_last_pixel, in_center_of_out, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); |
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} |
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} |
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else |
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@ -1217,10 +1219,10 @@ static void stbir__calculate_filters(stbir__info* stbir_info, stbir__contributor |
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stbir__calculate_sample_range_downsample(n_adjusted, in_pixels_radius, scale_ratio, shift, &out_first_pixel, &out_last_pixel, &out_center_of_in); |
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stbir__calculate_coefficients_downsample(stbir_info, filter, scale_ratio, out_first_pixel, out_last_pixel, out_center_of_in, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); |
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stbir__calculate_coefficients_downsample(filter, scale_ratio, out_first_pixel, out_last_pixel, out_center_of_in, stbir__get_contributor(contributors, n), stbir__get_coefficient(coefficients, filter, scale_ratio, n, 0)); |
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} |
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stbir__normalize_downsample_coefficients(stbir_info, contributors, coefficients, filter, scale_ratio, shift, input_size, output_size); |
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stbir__normalize_downsample_coefficients(contributors, coefficients, filter, scale_ratio, input_size, output_size); |
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} |
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} |
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@ -1270,7 +1272,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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int decode_pixel_index = x * channels; |
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int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; |
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for (c = 0; c < channels; c++) |
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decode_buffer[decode_pixel_index + c] = ((float)((const unsigned char*)input_data)[input_pixel_index + c]) / mi">255; |
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decode_buffer[decode_pixel_index + c] = ((float)((const unsigned char*)input_data)[input_pixel_index + c]) / n">stbir__max_uint8_as_float; |
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} |
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break; |
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@ -1283,7 +1285,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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decode_buffer[decode_pixel_index + c] = stbir__srgb_uchar_to_linear_float[((const unsigned char*)input_data)[input_pixel_index + c]]; |
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if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
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decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned char*)input_data)[input_pixel_index + alpha_channel]) / mi">255; |
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decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned char*)input_data)[input_pixel_index + alpha_channel]) / n">stbir__max_uint8_as_float; |
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} |
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break; |
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@ -1293,7 +1295,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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int decode_pixel_index = x * channels; |
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int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; |
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for (c = 0; c < channels; c++) |
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decode_buffer[decode_pixel_index + c] = ((float)((const unsigned short*)input_data)[input_pixel_index + c]) / mi">65535; |
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decode_buffer[decode_pixel_index + c] = ((float)((const unsigned short*)input_data)[input_pixel_index + c]) / n">stbir__max_uint16_as_float; |
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} |
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break; |
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@ -1303,10 +1305,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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int decode_pixel_index = x * channels; |
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int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; |
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for (c = 0; c < channels; c++) |
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decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear(((float)((const unsigned short*)input_data)[input_pixel_index + c]) / mi">65535); |
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decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear(((float)((const unsigned short*)input_data)[input_pixel_index + c]) / n">stbir__max_uint16_as_float); |
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if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
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decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned short*)input_data)[input_pixel_index + alpha_channel]) / mi">65535; |
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decode_buffer[decode_pixel_index + alpha_channel] = ((float)((const unsigned short*)input_data)[input_pixel_index + alpha_channel]) / n">stbir__max_uint16_as_float; |
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} |
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break; |
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@ -1316,7 +1318,7 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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int decode_pixel_index = x * channels; |
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int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; |
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for (c = 0; c < channels; c++) |
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decode_buffer[decode_pixel_index + c] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / mi">4294967295); |
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decode_buffer[decode_pixel_index + c] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / n">stbir__max_uint32_as_float); |
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} |
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break; |
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@ -1326,10 +1328,10 @@ static void stbir__decode_scanline(stbir__info* stbir_info, int n) |
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int decode_pixel_index = x * channels; |
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int input_pixel_index = stbir__edge_wrap(edge_horizontal, x, input_w) * channels; |
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for (c = 0; c < channels; c++) |
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decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear((float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / mi">4294967295)); |
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decode_buffer[decode_pixel_index + c] = stbir__srgb_to_linear((float)(((double)((const unsigned int*)input_data)[input_pixel_index + c]) / n">stbir__max_uint32_as_float)); |
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if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
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decode_buffer[decode_pixel_index + alpha_channel] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + alpha_channel]) / mi">4294967295); |
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decode_buffer[decode_pixel_index + alpha_channel] = (float)(((double)((const unsigned int*)input_data)[input_pixel_index + alpha_channel]) / n">stbir__max_uint32_as_float); |
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} |
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break; |
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@ -1411,6 +1413,8 @@ static float* stbir__add_empty_ring_buffer_entry(stbir__info* stbir_info, int n) |
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int ring_buffer_index; |
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float* ring_buffer; |
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stbir_info->ring_buffer_last_scanline = n; |
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if (stbir_info->ring_buffer_begin_index < 0) |
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{ |
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ring_buffer_index = stbir_info->ring_buffer_begin_index = 0; |
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@ -1418,24 +1422,21 @@ static float* stbir__add_empty_ring_buffer_entry(stbir__info* stbir_info, int n) |
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} |
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else |
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{ |
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ring_buffer_index = (stbir_info->ring_buffer_begin_index + (stbir_info->ring_buffer_last_scanline - stbir_info->ring_buffer_first_scanline) + 1) % stbir_info->vertical_filter_pixel_width; |
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ring_buffer_index = (stbir_info->ring_buffer_begin_index + (stbir_info->ring_buffer_last_scanline - stbir_info->ring_buffer_first_scanline)) % stbir_info->ring_buffer_num_entries; |
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STBIR_ASSERT(ring_buffer_index != stbir_info->ring_buffer_begin_index); |
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} |
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ring_buffer = stbir__get_ring_buffer_entry(stbir_info->ring_buffer, ring_buffer_index, stbir_info->ring_buffer_length_bytes / sizeof(float)); |
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memset(ring_buffer, 0, stbir_info->ring_buffer_length_bytes); |
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stbir_info->ring_buffer_last_scanline = n; |
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return ring_buffer; |
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} |
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static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, int n, float* output_buffer) |
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static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, float* output_buffer) |
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{ |
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int x, k; |
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int output_w = stbir_info->output_w; |
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int kernel_pixel_width = stbir_info->horizontal_filter_pixel_width; |
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int channels = stbir_info->channels; |
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float* decode_buffer = stbir__get_decode_buffer(stbir_info); |
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stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors; |
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@ -1515,12 +1516,10 @@ static void stbir__resample_horizontal_upsample(stbir__info* stbir_info, int n, |
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} |
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} |
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static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, int n, float* output_buffer) |
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static void stbir__resample_horizontal_downsample(stbir__info* stbir_info, float* output_buffer) |
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{ |
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int x, k; |
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int input_w = stbir_info->input_w; |
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int output_w = stbir_info->output_w; |
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int kernel_pixel_width = stbir_info->horizontal_filter_pixel_width; |
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int channels = stbir_info->channels; |
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float* decode_buffer = stbir__get_decode_buffer(stbir_info); |
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stbir__contributors* horizontal_contributors = stbir_info->horizontal_contributors; |
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@ -1654,9 +1653,9 @@ static void stbir__decode_and_resample_upsample(stbir__info* stbir_info, int n) |
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// Now resample it into the ring buffer. |
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if (stbir__use_width_upsampling(stbir_info)) |
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stbir__resample_horizontal_upsample(stbir_info, n, stbir__add_empty_ring_buffer_entry(stbir_info, n)); |
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stbir__resample_horizontal_upsample(stbir_info, stbir__add_empty_ring_buffer_entry(stbir_info, n)); |
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else |
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stbir__resample_horizontal_downsample(stbir_info, n, stbir__add_empty_ring_buffer_entry(stbir_info, n)); |
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stbir__resample_horizontal_downsample(stbir_info, stbir__add_empty_ring_buffer_entry(stbir_info, n)); |
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// Now it's sitting in the ring buffer ready to be used as source for the vertical sampling. |
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} |
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@ -1670,17 +1669,17 @@ static void stbir__decode_and_resample_downsample(stbir__info* stbir_info, int n |
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// Now resample it into the horizontal buffer. |
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if (stbir__use_width_upsampling(stbir_info)) |
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stbir__resample_horizontal_upsample(stbir_info, n, stbir_info->horizontal_buffer); |
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stbir__resample_horizontal_upsample(stbir_info, stbir_info->horizontal_buffer); |
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else |
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stbir__resample_horizontal_downsample(stbir_info, n, stbir_info->horizontal_buffer); |
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stbir__resample_horizontal_downsample(stbir_info, stbir_info->horizontal_buffer); |
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// Now it's sitting in the horizontal buffer ready to be distributed into the ring buffers. |
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} |
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// Get the specified scan line from the ring buffer. |
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static float* stbir__get_ring_buffer_scanline(int get_scanline, float* ring_buffer, int begin_index, int first_scanline, int ring_buffer_size, int ring_buffer_length) |
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static float* stbir__get_ring_buffer_scanline(int get_scanline, float* ring_buffer, int begin_index, int first_scanline, int ring_buffer_num_entries, int ring_buffer_length) |
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{ |
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int ring_buffer_index = (begin_index + (get_scanline - first_scanline)) % ring_buffer_size; |
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int ring_buffer_index = (begin_index + (get_scanline - first_scanline)) % ring_buffer_num_entries; |
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return stbir__get_ring_buffer_entry(ring_buffer, ring_buffer_index, ring_buffer_length); |
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} |
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@ -1715,19 +1714,23 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void |
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// build a table of all channels that need colorspace correction, so |
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// we don't perform colorspace correction on channels that don't need it. |
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for (x=0, num_nonalpha=0; x < channels; ++x) |
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for (x = 0, num_nonalpha = 0; x < channels; ++x) |
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{ |
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if (x != alpha_channel || (stbir_info->flags & STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
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nonalpha[num_nonalpha++] = x; |
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{ |
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nonalpha[num_nonalpha++] = (stbir_uint16)x; |
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} |
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} |
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#define STBIR__ROUND_INT(f) ((int) ((f)+0.5)) |
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#define STBIR__ROUND_UINT(f) ((stbir_uint32) ((f)+0.5)) |
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#ifdef STBIR__SATURATE_INT |
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#define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) * 255 )) |
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#define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) * 65535)) |
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#define STBIR__ENCODE_LINEAR8(f) stbir__saturate8 (STBIR__ROUND_INT((f) * stbir__max_uint8_as_float )) |
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#define STBIR__ENCODE_LINEAR16(f) stbir__saturate16(STBIR__ROUND_INT((f) * stbir__max_uint16_as_float)) |
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#else |
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#define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) * 255 ) |
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#define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) * 65535) |
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#define STBIR__ENCODE_LINEAR8(f) (unsigned char ) STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint8_as_float ) |
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#define STBIR__ENCODE_LINEAR16(f) (unsigned short) STBIR__ROUND_INT(stbir__saturate(f) * stbir__max_uint16_as_float) |
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#endif |
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switch (decode) |
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@ -1782,7 +1785,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void |
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for (n = 0; n < num_nonalpha; n++) |
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{ |
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int index = pixel_index + nonalpha[n]; |
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((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * mi">65535); |
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((unsigned short*)output_buffer)[index] = (unsigned short)STBIR__ROUND_INT(stbir__linear_to_srgb(stbir__saturate(encode_buffer[index])) * n">stbir__max_uint16_as_float); |
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} |
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if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
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@ -1799,7 +1802,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void |
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for (n = 0; n < channels; n++) |
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{ |
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int index = pixel_index + n; |
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|
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__saturate(encode_buffer[index])) * mi">4294967295); |
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|
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__saturate(encode_buffer[index])) * n">stbir__max_uint32_as_float); |
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|
} |
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} |
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break; |
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|
@ -1812,11 +1815,11 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void |
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|
for (n = 0; n < num_nonalpha; n++) |
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|
{ |
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|
int index = pixel_index + nonalpha[n]; |
|
|
|
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * mi">4294967295); |
|
|
|
((unsigned int*)output_buffer)[index] = (unsigned int)STBIR__ROUND_UINT(((double)stbir__linear_to_srgb(stbir__saturate(encode_buffer[index]))) * n">stbir__max_uint32_as_float); |
|
|
|
} |
|
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|
|
|
|
if (!(stbir_info->flags&STBIR_FLAG_ALPHA_USES_COLORSPACE)) |
|
|
|
((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * mi">4294967295); |
|
|
|
((unsigned int*)output_buffer)[pixel_index + alpha_channel] = (unsigned int)STBIR__ROUND_INT(((double)stbir__saturate(encode_buffer[pixel_index + alpha_channel])) * n">stbir__max_uint32_as_float); |
|
|
|
} |
|
|
|
break; |
|
|
|
|
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|
|
@ -1855,7 +1858,7 @@ static void stbir__encode_scanline(stbir__info* stbir_info, int num_pixels, void |
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|
|
} |
|
|
|
} |
|
|
|
|
|
|
|
static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, int in_first_scanline, int in_last_scanline, float in_center_of_out) |
|
|
|
static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n) |
|
|
|
{ |
|
|
|
int x, k; |
|
|
|
int output_w = stbir_info->output_w; |
|
|
|
@ -1865,7 +1868,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
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|
|
int alpha_channel = stbir_info->alpha_channel; |
|
|
|
int type = stbir_info->type; |
|
|
|
int colorspace = stbir_info->colorspace; |
|
|
|
int kernel_pixel_width = stbir_info->vertical_filter_pixel_width; |
|
|
|
int ring_buffer_entries = stbir_info->ring_buffer_num_entries; |
|
|
|
void* output_data = stbir_info->output_data; |
|
|
|
float* encode_buffer = stbir_info->encode_buffer; |
|
|
|
int decode = STBIR__DECODE(type, colorspace); |
|
|
|
@ -1876,7 +1879,6 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
float* ring_buffer = stbir_info->ring_buffer; |
|
|
|
int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index; |
|
|
|
int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline; |
|
|
|
int ring_buffer_last_scanline = stbir_info->ring_buffer_last_scanline; |
|
|
|
int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float); |
|
|
|
|
|
|
|
int n0,n1, output_row_start; |
|
|
|
@ -1900,7 +1902,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
for (k = n0; k <= n1; k++) |
|
|
|
{ |
|
|
|
int coefficient_index = coefficient_counter++; |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
for (x = 0; x < output_w; ++x) |
|
|
|
{ |
|
|
|
@ -1913,7 +1915,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
for (k = n0; k <= n1; k++) |
|
|
|
{ |
|
|
|
int coefficient_index = coefficient_counter++; |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
for (x = 0; x < output_w; ++x) |
|
|
|
{ |
|
|
|
@ -1927,7 +1929,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
for (k = n0; k <= n1; k++) |
|
|
|
{ |
|
|
|
int coefficient_index = coefficient_counter++; |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
for (x = 0; x < output_w; ++x) |
|
|
|
{ |
|
|
|
@ -1942,7 +1944,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
for (k = n0; k <= n1; k++) |
|
|
|
{ |
|
|
|
int coefficient_index = coefficient_counter++; |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
for (x = 0; x < output_w; ++x) |
|
|
|
{ |
|
|
|
@ -1958,7 +1960,7 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
for (k = n0; k <= n1; k++) |
|
|
|
{ |
|
|
|
int coefficient_index = coefficient_counter++; |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
for (x = 0; x < output_w; ++x) |
|
|
|
{ |
|
|
|
@ -1973,16 +1975,14 @@ static void stbir__resample_vertical_upsample(stbir__info* stbir_info, int n, in |
|
|
|
stbir__encode_scanline(stbir_info, output_w, (char *) output_data + output_row_start, encode_buffer, channels, alpha_channel, decode); |
|
|
|
} |
|
|
|
|
|
|
|
static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n, int in_first_scanline, int in_last_scanline, float in_center_of_out) |
|
|
|
static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n) |
|
|
|
{ |
|
|
|
int x, k; |
|
|
|
int output_w = stbir_info->output_w; |
|
|
|
int output_h = stbir_info->output_h; |
|
|
|
stbir__contributors* vertical_contributors = stbir_info->vertical_contributors; |
|
|
|
float* vertical_coefficients = stbir_info->vertical_coefficients; |
|
|
|
int channels = stbir_info->channels; |
|
|
|
int kernel_pixel_width = stbir_info->vertical_filter_pixel_width; |
|
|
|
void* output_data = stbir_info->output_data; |
|
|
|
int ring_buffer_entries = stbir_info->ring_buffer_num_entries; |
|
|
|
float* horizontal_buffer = stbir_info->horizontal_buffer; |
|
|
|
int coefficient_width = stbir_info->vertical_coefficient_width; |
|
|
|
int contributor = n + stbir_info->vertical_filter_pixel_margin; |
|
|
|
@ -1990,7 +1990,6 @@ static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n, |
|
|
|
float* ring_buffer = stbir_info->ring_buffer; |
|
|
|
int ring_buffer_begin_index = stbir_info->ring_buffer_begin_index; |
|
|
|
int ring_buffer_first_scanline = stbir_info->ring_buffer_first_scanline; |
|
|
|
int ring_buffer_last_scanline = stbir_info->ring_buffer_last_scanline; |
|
|
|
int ring_buffer_length = stbir_info->ring_buffer_length_bytes/sizeof(float); |
|
|
|
int n0,n1; |
|
|
|
|
|
|
|
@ -2005,7 +2004,7 @@ static void stbir__resample_vertical_downsample(stbir__info* stbir_info, int n, |
|
|
|
int coefficient_group = coefficient_width * contributor; |
|
|
|
float coefficient = vertical_coefficients[coefficient_group + coefficient_index]; |
|
|
|
|
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, kernel_pixel_width, ring_buffer_length); |
|
|
|
float* ring_buffer_entry = stbir__get_ring_buffer_scanline(k, ring_buffer, ring_buffer_begin_index, ring_buffer_first_scanline, ring_buffer_entries, ring_buffer_length); |
|
|
|
|
|
|
|
switch (channels) { |
|
|
|
case 1: |
|
|
|
@ -2071,7 +2070,7 @@ static void stbir__buffer_loop_upsample(stbir__info* stbir_info) |
|
|
|
|
|
|
|
stbir__calculate_sample_range_upsample(y, out_scanlines_radius, scale_ratio, stbir_info->vertical_shift, &in_first_scanline, &in_last_scanline, &in_center_of_out); |
|
|
|
|
|
|
|
STBIR_ASSERT(in_last_scanline - in_first_scanline <= stbir_info->vertical_filter_pixel_width); |
|
|
|
STBIR_ASSERT(in_last_scanline - in_first_scanline + 1 <= stbir_info->ring_buffer_num_entries); |
|
|
|
|
|
|
|
if (stbir_info->ring_buffer_begin_index >= 0) |
|
|
|
{ |
|
|
|
@ -2090,7 +2089,7 @@ static void stbir__buffer_loop_upsample(stbir__info* stbir_info) |
|
|
|
else |
|
|
|
{ |
|
|
|
stbir_info->ring_buffer_first_scanline++; |
|
|
|
stbir_info->ring_buffer_begin_index = (stbir_info->ring_buffer_begin_index + 1) % stbir_info->vertical_filter_pixel_width; |
|
|
|
stbir_info->ring_buffer_begin_index = (stbir_info->ring_buffer_begin_index + 1) % stbir_info->ring_buffer_num_entries; |
|
|
|
} |
|
|
|
} |
|
|
|
} |
|
|
|
@ -2103,7 +2102,7 @@ static void stbir__buffer_loop_upsample(stbir__info* stbir_info) |
|
|
|
stbir__decode_and_resample_upsample(stbir_info, stbir_info->ring_buffer_last_scanline + 1); |
|
|
|
|
|
|
|
// Now all buffers should be ready to write a row of vertical sampling. |
|
|
|
stbir__resample_vertical_upsample(stbir_info, y, in_first_scanline, in_last_scanline, in_center_of_out); |
|
|
|
stbir__resample_vertical_upsample(stbir_info, y); |
|
|
|
|
|
|
|
STBIR_PROGRESS_REPORT((float)y / stbir_info->output_h); |
|
|
|
} |
|
|
|
@ -2148,7 +2147,7 @@ static void stbir__empty_ring_buffer(stbir__info* stbir_info, int first_necessar |
|
|
|
else |
|
|
|
{ |
|
|
|
stbir_info->ring_buffer_first_scanline++; |
|
|
|
stbir_info->ring_buffer_begin_index = (stbir_info->ring_buffer_begin_index + 1) % stbir_info->vertical_filter_pixel_width; |
|
|
|
stbir_info->ring_buffer_begin_index = (stbir_info->ring_buffer_begin_index + 1) % stbir_info->ring_buffer_num_entries; |
|
|
|
} |
|
|
|
} |
|
|
|
} |
|
|
|
@ -2172,7 +2171,7 @@ static void stbir__buffer_loop_downsample(stbir__info* stbir_info) |
|
|
|
|
|
|
|
stbir__calculate_sample_range_downsample(y, in_pixels_radius, scale_ratio, stbir_info->vertical_shift, &out_first_scanline, &out_last_scanline, &out_center_of_in); |
|
|
|
|
|
|
|
STBIR_ASSERT(out_last_scanline - out_first_scanline <= stbir_info->vertical_filter_pixel_width); |
|
|
|
STBIR_ASSERT(out_last_scanline - out_first_scanline + 1 <= stbir_info->ring_buffer_num_entries); |
|
|
|
|
|
|
|
if (out_last_scanline < 0 || out_first_scanline >= output_h) |
|
|
|
continue; |
|
|
|
@ -2189,7 +2188,7 @@ static void stbir__buffer_loop_downsample(stbir__info* stbir_info) |
|
|
|
stbir__add_empty_ring_buffer_entry(stbir_info, stbir_info->ring_buffer_last_scanline + 1); |
|
|
|
|
|
|
|
// Now the horizontal buffer is ready to write to all ring buffer rows. |
|
|
|
stbir__resample_vertical_downsample(stbir_info, y, out_first_scanline, out_last_scanline, out_center_of_in); |
|
|
|
stbir__resample_vertical_downsample(stbir_info, y); |
|
|
|
} |
|
|
|
|
|
|
|
stbir__empty_ring_buffer(stbir_info, stbir_info->output_h); |
|
|
|
@ -2246,13 +2245,16 @@ static stbir_uint32 stbir__calculate_memory(stbir__info *info) |
|
|
|
info->horizontal_num_contributors = stbir__get_contributors(info->horizontal_scale, info->horizontal_filter, info->input_w, info->output_w); |
|
|
|
info->vertical_num_contributors = stbir__get_contributors(info->vertical_scale , info->vertical_filter , info->input_h, info->output_h); |
|
|
|
|
|
|
|
// One extra entry because floating point precision problems sometimes cause an extra to be necessary. |
|
|
|
info->ring_buffer_num_entries = filter_height + 1; |
|
|
|
|
|
|
|
info->horizontal_contributors_size = info->horizontal_num_contributors * sizeof(stbir__contributors); |
|
|
|
info->horizontal_coefficients_size = stbir__get_total_horizontal_coefficients(info) * sizeof(float); |
|
|
|
info->vertical_contributors_size = info->vertical_num_contributors * sizeof(stbir__contributors); |
|
|
|
info->vertical_coefficients_size = stbir__get_total_vertical_coefficients(info) * sizeof(float); |
|
|
|
info->decode_buffer_size = (info->input_w + pixel_margin * 2) * info->channels * sizeof(float); |
|
|
|
info->horizontal_buffer_size = info->output_w * info->channels * sizeof(float); |
|
|
|
info->ring_buffer_size = info->output_w * info->channels * filter_height * sizeof(float); |
|
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info->ring_buffer_size = info->output_w * info->channels * info->ring_buffer_num_entries * sizeof(float); |
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info->encode_buffer_size = info->output_w * info->channels * sizeof(float); |
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STBIR_ASSERT(info->horizontal_filter != 0); |
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@ -2390,8 +2392,8 @@ static int stbir__resize_allocated(stbir__info *info, |
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// This signals that the ring buffer is empty |
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info->ring_buffer_begin_index = -1; |
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stbir__calculate_filters(infop">, info->horizontal_contributors, info->horizontal_coefficients, info->horizontal_filter, info->horizontal_scale, info->horizontal_shift, info->input_w, info->output_w); |
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stbir__calculate_filters(infop">, info->vertical_contributors, info->vertical_coefficients, info->vertical_filter, info->vertical_scale, info->vertical_shift, info->input_h, info->output_h); |
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stbir__calculate_filters(info->horizontal_contributors, info->horizontal_coefficients, info->horizontal_filter, info->horizontal_scale, info->horizontal_shift, info->input_w, info->output_w); |
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stbir__calculate_filters(info->vertical_contributors, info->vertical_coefficients, info->vertical_filter, info->vertical_scale, info->vertical_shift, info->input_h, info->output_h); |
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STBIR_PROGRESS_REPORT(0); |
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@ -2578,3 +2580,45 @@ STBIRDEF int stbir_resize_region( const void *input_pixels , int input_w , int |
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} |
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#endif // STB_IMAGE_RESIZE_IMPLEMENTATION |
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/* |
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------------------------------------------------------------------------------ |
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This software is available under 2 licenses -- choose whichever you prefer. |
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------------------------------------------------------------------------------ |
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ALTERNATIVE A - MIT License |
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Copyright (c) 2017 Sean Barrett |
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Permission is hereby granted, free of charge, to any person obtaining a copy of |
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this software and associated documentation files (the "Software"), to deal in |
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the Software without restriction, including without limitation the rights to |
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies |
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|
of the Software, and to permit persons to whom the Software is furnished to do |
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so, subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in all |
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copies or substantial portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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SOFTWARE. |
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------------------------------------------------------------------------------ |
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ALTERNATIVE B - Public Domain (www.unlicense.org) |
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This is free and unencumbered software released into the public domain. |
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Anyone is free to copy, modify, publish, use, compile, sell, or distribute this |
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software, either in source code form or as a compiled binary, for any purpose, |
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commercial or non-commercial, and by any means. |
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In jurisdictions that recognize copyright laws, the author or authors of this |
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software dedicate any and all copyright interest in the software to the public |
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domain. We make this dedication for the benefit of the public at large and to |
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the detriment of our heirs and successors. We intend this dedication to be an |
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overt act of relinquishment in perpetuity of all present and future rights to |
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this software under copyright law. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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------------------------------------------------------------------------------ |
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*/ |
raysan5
8 年之前