knb
094f183994
CLIヘルプ文言を簡潔化しつつ、右余白トリム機能と関連API・ドキュメント更新をまとめて取り込み、PNG/SVG/テンプレート経路での利用体験を揃える。 Made-with: Cursor
85 lines
2.3 KiB
C
85 lines
2.3 KiB
C
/*
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* libptouch — raster right blank trim
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*
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* Author: knb
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* Email: knb@artif.org
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*/
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#include "libptouch_internal.h"
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#include <stdlib.h>
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#include <string.h>
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libptouch_err_t libptouch_trim_right_blank_columns(
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libptouch_ctx *ctx, const uint8_t *data, size_t data_len,
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const libptouch_raster_params_t *in_params, uint16_t right_padding_dots,
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uint8_t **out_raster, size_t *out_raster_bytes,
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libptouch_raster_params_t *out_params)
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{
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if (!ctx || !data || !in_params || !out_raster || !out_raster_bytes ||
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!out_params) {
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if (ctx)
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ptouch_set_error(ctx, LIBPTOUCH_ERR_ARG, "null argument");
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return LIBPTOUCH_ERR_ARG;
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}
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libptouch_err_t v = libptouch_check_raster(ctx, data, data_len, in_params);
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if (v != LIBPTOUCH_OK)
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return v;
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uint32_t width = in_params->width_dots;
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uint32_t height = in_params->height_dots;
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size_t row_bytes = ((size_t)width + 7u) / 8u;
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int32_t rightmost = -1;
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for (uint32_t y = 0; y < height; y++) {
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const uint8_t *row = data + (size_t)y * row_bytes;
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for (int32_t x = (int32_t)width - 1; x >= 0; x--) {
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uint8_t b = row[(size_t)x / 8u];
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uint8_t bit = (uint8_t)(7u - ((uint32_t)x % 8u));
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if (((b >> bit) & 1u) == 0)
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continue;
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if (x > rightmost)
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rightmost = x;
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break;
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}
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}
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uint32_t new_width = width;
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if (rightmost >= 0) {
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uint32_t trimmed = (uint32_t)(rightmost + 1);
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uint32_t padded = trimmed + (uint32_t)right_padding_dots;
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if (padded > width)
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padded = width;
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if (padded < width)
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new_width = padded;
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}
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size_t new_row_bytes = ((size_t)new_width + 7u) / 8u;
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size_t total = new_row_bytes * (size_t)height;
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uint8_t *out = (uint8_t *)calloc(1u, total);
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if (!out) {
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ptouch_set_error(ctx, LIBPTOUCH_ERR_NOMEM, "calloc raster failed");
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return LIBPTOUCH_ERR_NOMEM;
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}
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uint8_t last_mask = 0xFFu;
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if ((new_width % 8u) != 0u)
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last_mask = (uint8_t)((0xFFu << (8u - (new_width % 8u))) & 0xFFu);
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for (uint32_t y = 0; y < height; y++) {
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const uint8_t *src = data + (size_t)y * row_bytes;
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uint8_t *dst = out + (size_t)y * new_row_bytes;
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memcpy(dst, src, new_row_bytes);
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dst[new_row_bytes - 1u] &= last_mask;
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}
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*out_raster = out;
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*out_raster_bytes = total;
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out_params->width_dots = new_width;
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out_params->height_dots = height;
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out_params->margin_mm = in_params->margin_mm;
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ptouch_set_error(ctx, LIBPTOUCH_OK, "");
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return LIBPTOUCH_OK;
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}
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