300 lines
10 KiB
C
300 lines
10 KiB
C
/* source/draw/sgl_draw_circle.c
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*
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* MIT License
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*
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* Copyright(c) 2023-present All contributors of SGL
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* Document reference link: https://sgl-docs.readthedocs.io
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do 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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#include <sgl_core.h>
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#include <sgl_draw.h>
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#include <sgl_math.h>
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/**
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* @brief Draw a circle
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* @param surf Surface
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* @param area Area of the circle
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* @param cx X coordinate of the center
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* @param cy Y coordinate of the center
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* @param radius Radius of the circle
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* @param color Color of the circle
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* @param alpha Alpha of the circle
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* @return none
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*/
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void sgl_draw_fill_circle(sgl_surf_t *surf, sgl_area_t *area, int16_t cx, int16_t cy, int16_t radius, sgl_color_t color, uint8_t alpha)
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{
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sgl_area_t clip = SGL_AREA_MAX;
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sgl_color_t *buf = NULL, *blend = NULL;
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sgl_surf_clip_area_return(surf, area, &clip);
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sgl_area_t c_rect = {
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.x1 = cx - radius,
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.x2 = cx + radius,
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.y1 = cy - radius,
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.y2 = cy + radius
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};
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if (!sgl_area_selfclip(&clip, &c_rect)) {
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return;
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}
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int y2 = 0, real_r2 = 0, edge_alpha = 0;
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int r2 = sgl_pow2(radius);
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int r2_edge = sgl_pow2(radius + 1);
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buf = sgl_surf_get_buf(surf, clip.x1 - surf->x1, clip.y1 - surf->y1);
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for (int y = clip.y1; y <= clip.y2; y++) {
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blend = buf;
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y2 = sgl_pow2(y - cy);
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for (int x = clip.x1; x <= clip.x2; x++, blend++) {
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real_r2 = sgl_pow2(x - cx) + y2;
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if (real_r2 >= r2_edge) {
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if(x > cx)
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break;
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continue;
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}
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else if (real_r2 >= r2) {
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edge_alpha = SGL_ALPHA_MAX - sgl_sqrt_error(real_r2);
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*blend = (alpha == SGL_ALPHA_MAX ? sgl_color_mixer(color, *blend, edge_alpha) : sgl_color_mixer(sgl_color_mixer(color, *blend, edge_alpha), *blend, alpha));
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}
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else {
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*blend = (alpha == SGL_ALPHA_MAX ? color : sgl_color_mixer(color, *blend, alpha));
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}
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}
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buf += surf->w;
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}
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}
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#if (!CONFIG_SGL_PIXMAP_BILINEAR_INTERP)
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/**
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* @brief Draw a circle with pixmap and alpha
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* @param surf Surface
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* @param area Area of the circle
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* @param cx X coordinate of the center
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* @param cy Y coordinate of the center
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* @param radius Radius of the circle
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* @param pixmap Pixmap of image
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* @param alpha Alpha of the circle
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* @return none
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*/
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void sgl_draw_fill_circle_pixmap(sgl_surf_t *surf, sgl_area_t *area, int16_t cx, int16_t cy, int16_t radius, const sgl_pixmap_t *pixmap, uint8_t alpha)
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{
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int y2 = 0, real_r2 = 0, s_x = cx - radius, s_y = cy - radius;
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int r2 = radius * radius;
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int r2_max = (radius + 1) * (radius + 1);
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sgl_color_t *buf = NULL, *pbuf = NULL, *blend = NULL;
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sgl_area_t clip = SGL_AREA_MAX;
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uint8_t edge_alpha = 0;
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sgl_surf_clip_area_return(surf, area, &clip);
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sgl_area_t c_rect = {
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.x1 = cx - radius,
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.x2 = cx + radius,
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.y1 = cy - radius,
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.y2 = cy + radius
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};
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if (!sgl_area_selfclip(&clip, &c_rect)) {
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return;
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}
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uint32_t scale_x = (pixmap->width << SGL_FIXED_SHIFT) / (radius * 2);
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uint32_t scale_y = (pixmap->height << SGL_FIXED_SHIFT) / (radius * 2);
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uint32_t step_x = 0, step_y = 0;
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buf = sgl_surf_get_buf(surf, clip.x1 - surf->x1, clip.y1 - surf->y1);
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for (int y = clip.y1; y <= clip.y2; y++) {
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blend = buf;
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y2 = sgl_pow2(y - cy);
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step_y = (scale_y * (y - s_y)) >> SGL_FIXED_SHIFT;
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for (int x = clip.x1; x <= clip.x2; x++, blend++) {
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real_r2 = sgl_pow2(x - cx) + y2;
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step_x = (scale_x * (x - s_x)) >> SGL_FIXED_SHIFT;
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pbuf = sgl_pixmap_get_buf(pixmap, step_x, step_y);
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if (real_r2 >= r2_max) {
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if(x > cx)
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break;
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continue;
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}
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else if (real_r2 >= r2) {
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edge_alpha = SGL_ALPHA_MAX - sgl_sqrt_error(real_r2);
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*blend = (alpha == SGL_ALPHA_MAX ? sgl_color_mixer(*pbuf, *blend, edge_alpha) : sgl_color_mixer(sgl_color_mixer(*pbuf, *blend, edge_alpha), *blend, alpha));
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}
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else {
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*blend = (alpha == SGL_ALPHA_MAX ? *pbuf : sgl_color_mixer(*pbuf, *blend, alpha));
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}
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}
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buf += surf->w;
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}
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}
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#else
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void sgl_draw_fill_circle_pixmap(sgl_surf_t *surf, sgl_area_t *area, int16_t cx, int16_t cy, int16_t radius, const sgl_pixmap_t *pixmap, uint8_t alpha)
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{
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int y2 = 0, real_r2 = 0, s_x = cx - radius, s_y = cy - radius;
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int r2 = radius * radius;
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int r2_max = (radius + 1) * (radius + 1);
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sgl_color_t *buf = NULL, *blend = NULL, ip_color, *pix = (sgl_color_t *)pixmap->bitmap.array;
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sgl_area_t clip = SGL_AREA_MAX;
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uint8_t edge_alpha = 0;
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int fx = 0, fy = 0;
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sgl_surf_clip_area_return(surf, area, &clip);
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sgl_area_t c_rect = {
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.x1 = cx - radius,
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.x2 = cx + radius,
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.y1 = cy - radius,
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.y2 = cy + radius
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};
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if (!sgl_area_selfclip(&clip, &c_rect)) {
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return;
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}
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const int32_t scale_x = ((int32_t)pixmap->width << SGL_FIXED_SHIFT) / (radius * 2);
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const int32_t scale_y = ((int32_t)pixmap->height << SGL_FIXED_SHIFT) / (radius * 2);
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buf = sgl_surf_get_buf(surf, clip.x1 - surf->x1, clip.y1 - surf->y1);
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for (int y = clip.y1; y <= clip.y2; y++) {
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blend = buf;
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y2 = sgl_pow2(y - cy);
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fy = (int32_t)(y - s_y) * scale_y;
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for (int x = clip.x1; x <= clip.x2; x++, blend++) {
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real_r2 = sgl_pow2(x - cx) + y2;
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fx = (int32_t)(x - s_x) * scale_x;
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ip_color = sgl_draw_biln_color(pix, pixmap->width, pixmap->height, fx, fy);
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if (real_r2 >= r2_max) {
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if(x > cx)
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break;
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continue;
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}
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else if (real_r2 >= r2) {
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edge_alpha = SGL_ALPHA_MAX - sgl_sqrt_error(real_r2);
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*blend = (alpha == SGL_ALPHA_MAX ? sgl_color_mixer(ip_color, *blend, edge_alpha) : sgl_color_mixer(sgl_color_mixer(ip_color, *blend, edge_alpha), *blend, alpha));
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}
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else {
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*blend = (alpha == SGL_ALPHA_MAX ? ip_color : sgl_color_mixer(ip_color, *blend, alpha));
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}
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}
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buf += surf->w;
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}
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}
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#endif // CONFIG_SGL_PIXMAP_BILINEAR_INTERP
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/**
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* @brief Draw a circle with alpha and border
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* @param surf Surface
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* @param area Area of the circle
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* @param cx X coordinate of the center
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* @param cy Y coordinate of the center
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* @param radius Radius of the circle
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* @param color Color of the circle
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* @param border_color Color of the border
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* @param border_width Width of the border
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* @param alpha Alpha of the circle
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* @return none
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*/
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void sgl_draw_fill_circle_with_border(sgl_surf_t *surf, sgl_area_t *area, int16_t cx, int16_t cy, int16_t radius, sgl_color_t color, sgl_color_t border_color, int16_t border_width, uint8_t alpha)
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{
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int radius_in = sgl_max(radius - border_width + 1, 0);
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int y2 = 0, real_r2 = 0;
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int in_r2 = sgl_pow2(radius_in);
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int out_r2 = sgl_pow2(radius);
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sgl_color_t *buf = NULL, *blend = NULL;
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int in_r2_max = sgl_pow2(radius_in - 1);
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int out_r2_max = sgl_pow2(radius + 1);
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uint8_t edge_alpha = 0;
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sgl_area_t clip = SGL_AREA_MAX;
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sgl_surf_clip_area_return(surf, area, &clip);
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buf = sgl_surf_get_buf(surf, clip.x1 - surf->x1, clip.y1 - surf->y1);
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for (int y = clip.y1; y <= clip.y2; y++) {
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blend = buf;
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y2 = sgl_pow2(y - cy);
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for (int x = clip.x1; x <= clip.x2; x++, blend++) {
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real_r2 = sgl_pow2(x - cx) + y2;
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if (real_r2 >= out_r2_max) {
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if (x > cx)
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break;
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continue;
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}
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if (real_r2 < in_r2_max) {
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*blend = (alpha == SGL_ALPHA_MAX ? color : sgl_color_mixer(color, *blend, alpha));
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continue;
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}
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if (real_r2 < in_r2 ) {
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edge_alpha = sgl_sqrt_error(real_r2);
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*blend = (alpha == SGL_ALPHA_MAX ? sgl_color_mixer(border_color, color, sgl_sqrt_error(real_r2)) : sgl_color_mixer(sgl_color_mixer(border_color, color, edge_alpha), *blend, alpha));
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}
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else if (real_r2 > out_r2) {
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edge_alpha = SGL_ALPHA_MAX - sgl_sqrt_error(real_r2);
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*blend = (alpha == SGL_ALPHA_MAX ? sgl_color_mixer(border_color, *blend, edge_alpha) : sgl_color_mixer(sgl_color_mixer(border_color, *blend, edge_alpha), *blend, alpha));
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}
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else {
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*blend = (alpha == SGL_ALPHA_MAX ? border_color : sgl_color_mixer(border_color, *blend, alpha));
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}
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}
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buf += surf->w;
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}
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}
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/**
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* @brief draw task, the task contains the draw information and canvas
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* @param surf surface pointer
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* @param area the area of the task
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* @param desc the draw information
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* @return none
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*/
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void sgl_draw_circle(sgl_surf_t *surf, sgl_area_t *area, sgl_draw_circle_t *desc)
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{
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sgl_color_t color = desc->color;
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int16_t radius = desc->radius;
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uint8_t alpha = desc->alpha;
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uint16_t border = desc->border;
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sgl_color_t border_color = desc->border_color;
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if (unlikely(desc->alpha == SGL_ALPHA_MIN)) {
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return;
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}
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if (desc->pixmap == NULL) {
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if (border) {
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sgl_draw_fill_circle_with_border(surf, area, desc->cx, desc->cy, radius, color, border_color, border, alpha);
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}
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else {
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sgl_draw_fill_circle(surf, area, desc->cx, desc->cy, radius, color, alpha);
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}
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}
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else {
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sgl_draw_fill_circle_pixmap(surf, area, desc->cx, desc->cy, radius, desc->pixmap, alpha);
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}
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}
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