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93 lines
2.1 KiB
93 lines
2.1 KiB
7 months ago
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GDC_CLIP_H
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#define GDC_CLIP_H
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#include <common.h>
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#include "gdc.h"
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typedef struct {
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int16_t dst_x;
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int16_t dst_y;
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int16_t src_x;
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int16_t src_y;
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int16_t width;
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int16_t height;
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} gdc_clip_t;
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static inline gdc_clip_t gdc_clip(gdc_rect_t dst, gdc_size_t size,
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const gdc_bitmap_ref_t* src) {
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int16_t dst_x = dst.x0;
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int16_t dst_y = dst.y0;
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int16_t src_x = 0;
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int16_t src_y = 0;
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if (src != NULL) {
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src_x += src->offset.x;
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src_y += src->offset.y;
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// Normalize negative x-offset of src bitmap
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if (src_x < 0) {
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dst_x -= src_x;
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src_x = 0;
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}
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// Normalize negative y-offset of src bitmap
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if (src_y < 0) {
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dst_y -= src_y;
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src_y = 0;
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}
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}
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// Normalize negative top-left of destination rectangle
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if (dst_x < 0) {
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src_x -= dst_x;
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dst_x = 0;
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}
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if (dst_y < 0) {
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src_y -= dst_y;
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dst_y = 0;
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}
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// Calculate dimension of effective rectangle
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int16_t width = MIN(size.x, dst.x1) - dst_x;
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int16_t height = MIN(size.y, dst.y1) - dst_y;
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if (src != NULL) {
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width = MIN(width, src->bitmap->size.x - src_x);
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height = MIN(height, src->bitmap->size.y - src_y);
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}
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gdc_clip_t clip = {
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.dst_x = dst_x,
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.dst_y = dst_y,
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.src_x = src_x,
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.src_y = src_y,
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.width = width,
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.height = height,
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};
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return clip;
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}
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#endif // GDC_CLIP_H
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