71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
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#include <stdio.h>
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#include <stdlib.h>
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typedef struct
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{
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int width;
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int height;
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int refer_width;
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int refer_height;
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float scale_rate;
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float match_rate;
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} ui_scaler;
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void *ui_scaler_new(int width, int height)
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{
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ui_scaler *scaler;
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scaler = malloc(sizeof(ui_scaler));
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if (!scaler) return NULL;
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scaler->width = width;
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scaler->height = height;
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scaler->scale_rate = 1.0f;
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scaler->match_rate = 0.5f;
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return scaler;
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}
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void ui_scaler_set_refer_size(void *scaler, int width, int height)
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{
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ui_scaler *_scaler = (ui_scaler *)scaler;
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float rate_hor, rate_ver;
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if (!scaler) return;
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rate_hor = (float)width / _scaler->width;
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rate_ver = (float)height / _scaler->height;
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_scaler->refer_width = width;
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_scaler->refer_height = height;
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_scaler->scale_rate = rate_hor * (1.0f - _scaler->match_rate) +
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rate_ver * _scaler->match_rate;
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printf("%d %d %f\n", width, height, _scaler->scale_rate);
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}
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void ui_scaler_set_match_rate(void *scaler, float rate)
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{
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ui_scaler *_scaler = (ui_scaler *)scaler;
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if (!scaler) return;
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_scaler->match_rate = rate;
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ui_scaler_set_refer_size(scaler, _scaler->refer_width,
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_scaler->refer_height);
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}
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int ui_scaler_calc(void *scaler, int value)
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{
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ui_scaler *_scaler = (ui_scaler *)scaler;
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if (!scaler) return value;
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return (int)(value * _scaler->scale_rate);
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}
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void ui_scaler_del(void *scaler)
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{
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free(scaler);
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}
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