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Nuklear/demo/x11_rawfb/nuklear_rawfb.h
Patrick Rudolph 2eb72b26e4 Add software rasterizer library and demo. 
The software rasterizer is to be used with raw framebuffer
devices, where no GPU or X11 is available.
The demo emulates a raw framebuffer on X11 using XShmImage / XImage.

Features implemented:
* Drawing primitives
* Drawing polygons (using Darel Rex Finley algorithm)
* Drawing arcs and circles (using Bresenham's elipses algorithm)
* Drawing images using nearest filtering
* Bounds check on every operation
* Fastpath for lines
* Font rendering using nearest filtering
* Window resize
* Thread safe implementation by using a context
* Fixed lower and upper scissors on fast-path
* Adapted coding style to nuklear's style
* Implemented text scissors

Color formats:
Define one of them at compile time.
* RAWFB_RGBX_8888 (32bpp)
* RAWFB_XRGB_8888 (32bpp)

Tested:
The library has been tested on Lenovo Thinkpad T500 and is able to render
more than 30fps on a single core with no further optimizations and VSNYC enabled.

TODO:
* Improve font rendering by using filters.
* Account font foreground color.

Usage:
The raw framebuffer library needs a "texture" that holds the prerendered
font data. The texture is used at runtime to blit the letters onto screen.
You have to provide the framebuffer address, dimension and pitch.

Signed-off-by: Patrick Rudolph <siro@das-labor.org>
2017-10-07 12:08:24 +02:00

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/*
* MIT License
*
* Copyright (c) 2016-2017 Patrick Rudolph <siro@das-labor.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* ==============================================================
*
* API
*
* ===============================================================
*/
#ifndef NK_RAWFB_H_
#define NK_RAWFB_H_
struct rawfb_context;
/* All functions are thread-safe */
NK_API struct rawfb_context *nk_rawfb_init(void *fb, void *tex_mem, const unsigned int w, const unsigned int h, const unsigned int pitch);
NK_API void nk_rawfb_render(const struct rawfb_context *rawfb, const struct nk_color clear, const unsigned char enable_clear);
NK_API void nk_rawfb_shutdown(struct rawfb_context *rawfb);
NK_API void nk_rawfb_resize_fb(struct rawfb_context *rawfb, void *fb, const unsigned int w, const unsigned int h, const unsigned int pitch);
#endif
/*
* ==============================================================
*
* IMPLEMENTATION
*
* ===============================================================
*/
#ifdef NK_RAWFB_IMPLEMENTATION
struct rawfb_image {
void *pixels;
int w;
int h;
int pitch;
enum nk_font_atlas_format format;
};
struct rawfb_context {
struct nk_context ctx;
struct nk_rect scissors;
struct rawfb_image fb;
struct rawfb_image font_tex;
struct nk_font_atlas atlas;
};
#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif
#ifndef MAX
#define MAX(a,b) ((a) < (b) ? (b) : (a))
#endif
static unsigned int
nk_color_from_byte(const nk_byte *c)
{
unsigned int res = 0;
#if defined(RAWFB_RGBX_8888)
res |= (unsigned int)c[0] << 16;
res |= (unsigned int)c[1] << 8;
res |= (unsigned int)c[2] << 0;
#elif defined(RAWFB_XRGB_8888)
res = ((unsigned int *)c)[0];
#else
#error Define one of RAWFB_RGBX_8888 , RAWFB_XRGB_8888
#endif
return (res);
}
static void
nk_rawfb_setpixel(const struct rawfb_context *rawfb,
const short x0,
const short y0,
const struct nk_color col)
{
unsigned int c = nk_color_from_byte(&col.r);
unsigned int *ptr = (unsigned int *)rawfb->fb.pixels;
ptr += y0 * rawfb->fb.w;
ptr += x0;
if (y0 < rawfb->scissors.h && y0 >= rawfb->scissors.y &&
x0 >= rawfb->scissors.x && x0 < rawfb->scissors.w)
*ptr = c;
}
/*
* This function is called the most. Try to optimize it a bit...
*
* It does not check for scissors or image borders.
* The caller has to make sure it does no exceed bounds.
*/
static void
nk_rawfb_line_horizontal(const struct rawfb_context *rawfb,
const short x0,
const short y,
const short x1,
const struct nk_color col)
{
unsigned int i, n;
unsigned int c[16];
unsigned int *ptr = (unsigned int *)rawfb->fb.pixels;
ptr += y * rawfb->fb.w;
ptr += x0;
n = x1 - x0;
for (i = 0; i < sizeof(c) / sizeof(c[0]); i++)
c[i] = nk_color_from_byte(&col.r);
while (n > 16) {
memcpy((void *)ptr, c, sizeof(c));
n -= 16;
ptr += 16;
}
for (i = 0; i < n; i++)
ptr[i] = c[i];
}
static void
nk_rawfb_imagesetpixel(const struct rawfb_image *img,
const int x0,
const int y0,
const struct nk_color col)
{
unsigned char *ptr;
NK_ASSERT(img);
if (y0 < img->h && y0 > 0 && x0 > 0 && x0 < img->w) {
ptr = img->pixels;
if (img->format == NK_FONT_ATLAS_ALPHA8) {
ptr += img->pitch * y0;
ptr[x0] = col.a;
} else {
ptr += img->pitch * y0;
((struct nk_color *)ptr)[x0] = col;
}
}
}
static struct nk_color
nk_image_getpixel(const struct rawfb_image *img,
const int x0,
const int y0)
{
struct nk_color col = {0, 0, 0, 0};
unsigned char *ptr;
NK_ASSERT(img);
if (y0 < img->h && y0 > 0 && x0 > 0 && x0 < img->w) {
ptr = img->pixels;
if (img->format == NK_FONT_ATLAS_ALPHA8) {
ptr += img->pitch * y0;
col.a = ptr[x0];
col.b = col.g = col.r = 0xff;
} else {
ptr += img->pitch * y0;
col = ((struct nk_color *)ptr)[x0];
}
}
return col;
}
static void
nk_image_blendpixel(const struct rawfb_image *img,
const int x0,
const int y0,
struct nk_color col)
{
struct nk_color col2;
unsigned char inv_a;
if (col.a == 0)
return;
inv_a = 0xff - col.a;
col2 = nk_image_getpixel(img, x0, y0);
col.r = (col.r * col.a + col2.r * inv_a) >> 8;
col.g = (col.g * col.a + col2.g * inv_a) >> 8;
col.b = (col.b * col.a + col2.b * inv_a) >> 8;
nk_rawfb_imagesetpixel(img, x0, y0, col);
}
static void
nk_rawfb_scissor(struct rawfb_context *rawfb,
const float x,
const float y,
const float w,
const float h)
{
rawfb->scissors.x = MIN(MAX(x, 0), rawfb->fb.w);
rawfb->scissors.y = MIN(MAX(y, 0), rawfb->fb.h);
rawfb->scissors.w = MIN(MAX(w + x, 0), rawfb->fb.w);
rawfb->scissors.h = MIN(MAX(h + y, 0), rawfb->fb.h);
}
static void
nk_rawfb_stroke_line(const struct rawfb_context *rawfb,
short x0,
short y0,
short x1,
short y1,
const unsigned int line_thickness,
const struct nk_color col)
{
int dy, dx, stepx, stepy;
short tmp;
dy = y1 - y0;
dx = x1 - x0;
/* fast path */
if (dy == 0) {
if (dx == 0 || y0 >= rawfb->scissors.h || y0 < rawfb->scissors.y)
return;
if (dx < 0) {
/* swap x0 and x1 */
tmp = x1;
x1 = x0;
x0 = tmp;
}
x1 = MIN(rawfb->scissors.w - 1, x1);
x0 = MIN(rawfb->scissors.w - 1, x0);
x1 = MAX(rawfb->scissors.x, x1);
x0 = MAX(rawfb->scissors.x, x0);
nk_rawfb_line_horizontal(rawfb, x0, y0, x1, col);
return;
}
if (dy < 0) {
dy = -dy;
stepy = -1;
} else {
stepy = 1;
}
if (dx < 0) {
dx = -dx;
stepx = -1;
} else {
stepx = 1;
}
dy <<= 1;
dx <<= 1;
nk_rawfb_setpixel(rawfb, x0, y0, col);
if (dx > dy) {
int fraction = dy - (dx >> 1);
while (x0 != x1) {
if (fraction >= 0) {
y0 += stepy;
fraction -= dx;
}
x0 += stepx;
fraction += dy;
nk_rawfb_setpixel(rawfb, x0, y0, col);
}
} else {
int fraction = dx - (dy >> 1);
while (y0 != y1) {
if (fraction >= 0) {
x0 += stepx;
fraction -= dy;
}
y0 += stepy;
fraction += dx;
nk_rawfb_setpixel(rawfb, x0, y0, col);
}
}
}
static void
nk_rawfb_fill_polygon(const struct rawfb_context *rawfb,
const struct nk_vec2i *pnts,
int count,
const struct nk_color col)
{
#define MAX_POINTS 64
int i = 0;
int left = 10000, top = 10000, bottom = 0, right = 0;
int nodes, nodeX[MAX_POINTS], pixelX, pixelY, j, swap ;
if (count == 0)
return;
if (count > MAX_POINTS)
count = MAX_POINTS;
/* Get polygon dimensions */
for (i = 0; i < count; i++) {
if (left > pnts[i].x)
left = pnts[i].x;
if (right < pnts[i].x)
right = pnts[i].x;
if (top > pnts[i].y)
top = pnts[i].y;
if (bottom < pnts[i].y)
bottom = pnts[i].y;
}
bottom ++;
right ++;
/* Polygon scanline algorithm released under public-domain by Darel Rex Finley, 2007 */
/* Loop through the rows of the image. */
for (pixelY = top; pixelY < bottom; pixelY ++) {
/* Build a list of nodes. */
nodes = 0;
j = count - 1;
for (i = 0; i < count; i++) {
if (((pnts[i].y < pixelY) && (pnts[j].y >= pixelY))
|| ((pnts[j].y < pixelY) && (pnts[i].y >= pixelY))) {
nodeX[nodes++]=
(int) ((float)pnts[i].x +
((float)pixelY - (float)pnts[i].y) / ((float)pnts[j].y - (float)pnts[i].y)
* ((float)pnts[j].x - (float)pnts[i].x));
}
j = i;
}
/* Sort the nodes, via a simple “Bubble” sort. */
i = 0;
while (i < nodes - 1) {
if (nodeX[i] > nodeX[i+1]) {
swap = nodeX[i];
nodeX[i] = nodeX[i+1];
nodeX[i+1] = swap;
if (i)
i--;
} else {
i++;
}
}
/* Fill the pixels between node pairs. */
for (i = 0; i < nodes; i += 2) {
if (nodeX[i ] >= right)
break;
if (nodeX[i + 1] > left) {
if (nodeX[i ] < left)
nodeX[i ]= left ;
if (nodeX[i + 1] > right)
nodeX[i + 1]= right;
for (pixelX = nodeX[i]; pixelX < nodeX[i + 1]; pixelX++)
nk_rawfb_setpixel(rawfb, pixelX, pixelY, col);
}
}
}
#undef MAX_POINTS
}
static void
nk_rawfb_stroke_arc(const struct rawfb_context *rawfb,
short x0,
short y0,
short w,
short h,
const short s,
const short line_thickness,
const struct nk_color col)
{
/* Bresenham's ellipses - modified to draw one quarter */
const int a2 = (w * w) / 4;
const int b2 = (h * h) / 4;
const int fa2 = 4 * a2, fb2 = 4 * b2;
int x, y, sigma;
if (s != 0 && s != 90 && s != 180 && s != 270)
return;
if (w < 1 || h < 1)
return;
/* Convert upper left to center */
h = (h + 1) / 2;
w = (w + 1) / 2;
x0 += w;
y0 += h;
/* First half */
for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) {
if (s == 180)
nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col);
else if (s == 270)
nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col);
else if (s == 0)
nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col);
else if (s == 90)
nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col);
if (sigma >= 0) {
sigma += fa2 * (1 - y);
y--;
}
sigma += b2 * ((4 * x) + 6);
}
/* Second half */
for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) {
if (s == 180)
nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col);
else if (s == 270)
nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col);
else if (s == 0)
nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col);
else if (s == 90)
nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col);
if (sigma >= 0) {
sigma += fb2 * (1 - x);
x--;
}
sigma += a2 * ((4 * y) + 6);
}
}
static void
nk_rawfb_fill_arc(const struct rawfb_context *rawfb,
short x0,
short y0,
short w,
short h,
const short s,
const struct nk_color col)
{
/* Bresenham's ellipses - modified to fill one quarter */
const int a2 = (w * w) / 4;
const int b2 = (h * h) / 4;
const int fa2 = 4 * a2, fb2 = 4 * b2;
int x, y, sigma;
struct nk_vec2i pnts[3];
if (s != 0 && s != 90 && s != 180 && s != 270)
return;
if (w < 1 || h < 1)
return;
/* Convert upper left to center */
h = (h + 1) / 2;
w = (w + 1) / 2;
x0 += w;
y0 += h;
pnts[0].x = x0;
pnts[0].y = y0;
pnts[2].x = x0;
pnts[2].y = y0;
/* First half */
for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) {
if (s == 180) {
pnts[1].x = x0 + x; pnts[1].y = y0 + y;
} else if (s == 270) {
pnts[1].x = x0 - x; pnts[1].y = y0 + y;
} else if (s == 0) {
pnts[1].x = x0 + x; pnts[1].y = y0 - y;
} else if (s == 90) {
pnts[1].x = x0 - x; pnts[1].y = y0 - y;
}
nk_rawfb_fill_polygon(rawfb, pnts, 3, col);
pnts[2] = pnts[1];
if (sigma >= 0) {
sigma += fa2 * (1 - y);
y--;
}
sigma += b2 * ((4 * x) + 6);
}
/* Second half */
for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) {
if (s == 180) {
pnts[1].x = x0 + x; pnts[1].y = y0 + y;
} else if (s == 270) {
pnts[1].x = x0 - x; pnts[1].y = y0 + y;
} else if (s == 0) {
pnts[1].x = x0 + x; pnts[1].y = y0 - y;
} else if (s == 90) {
pnts[1].x = x0 - x; pnts[1].y = y0 - y;
}
nk_rawfb_fill_polygon(rawfb, pnts, 3, col);
pnts[2] = pnts[1];
if (sigma >= 0) {
sigma += fb2 * (1 - x);
x--;
}
sigma += a2 * ((4 * y) + 6);
}
}
static void
nk_rawfb_stroke_rect(const struct rawfb_context *rawfb,
const short x,
const short y,
const short w,
const short h,
const short r,
const short line_thickness,
const struct nk_color col)
{
if (r == 0) {
nk_rawfb_stroke_line(rawfb, x, y, x + w, y, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x, y + h, x + w, y + h, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x, y, x, y + h, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x + w, y, x + w, y + h, line_thickness, col);
} else {
const short xc = x + r;
const short yc = y + r;
const short wc = (short)(w - 2 * r);
const short hc = (short)(h - 2 * r);
nk_rawfb_stroke_line(rawfb, xc, y, xc + wc, y, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x + w, yc, x + w, yc + hc, line_thickness, col);
nk_rawfb_stroke_line(rawfb, xc, y + h, xc + wc, y + h, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x, yc, x, yc + hc, line_thickness, col);
nk_rawfb_stroke_arc(rawfb, xc + wc - r, y,
(unsigned)r*2, (unsigned)r*2, 0 , line_thickness, col);
nk_rawfb_stroke_arc(rawfb, x, y,
(unsigned)r*2, (unsigned)r*2, 90 , line_thickness, col);
nk_rawfb_stroke_arc(rawfb, x, yc + hc - r,
(unsigned)r*2, (unsigned)r*2, 270 , line_thickness, col);
nk_rawfb_stroke_arc(rawfb, xc + wc - r, yc + hc - r,
(unsigned)r*2, (unsigned)r*2, 180 , line_thickness, col);
}
}
static void
nk_rawfb_fill_rect(const struct rawfb_context *rawfb,
const short x,
const short y,
const short w,
const short h,
const short r,
const struct nk_color col)
{
if (r == 0) {
int i;
for (i = 0; i < h; i++) {
nk_rawfb_stroke_line(rawfb, x, y + i, x + w, y + i, 1, col);
}
} else {
const short xc = x + r;
const short yc = y + r;
const short wc = (short)(w - 2 * r);
const short hc = (short)(h - 2 * r);
struct nk_vec2i pnts[12];
pnts[0].x = x;
pnts[0].y = yc;
pnts[1].x = xc;
pnts[1].y = yc;
pnts[2].x = xc;
pnts[2].y = y;
pnts[3].x = xc + wc;
pnts[3].y = y;
pnts[4].x = xc + wc;
pnts[4].y = yc;
pnts[5].x = x + w;
pnts[5].y = yc;
pnts[6].x = x + w;
pnts[6].y = yc + hc;
pnts[7].x = xc + wc;
pnts[7].y = yc + hc;
pnts[8].x = xc + wc;
pnts[8].y = y + h;
pnts[9].x = xc;
pnts[9].y = y + h;
pnts[10].x = xc;
pnts[10].y = yc + hc;
pnts[11].x = x;
pnts[11].y = yc + hc;
nk_rawfb_fill_polygon(rawfb, pnts, 12, col);
nk_rawfb_fill_arc(rawfb, xc + wc - r, y,
(unsigned)r*2, (unsigned)r*2, 0 , col);
nk_rawfb_fill_arc(rawfb, x, y,
(unsigned)r*2, (unsigned)r*2, 90 , col);
nk_rawfb_fill_arc(rawfb, x, yc + hc - r,
(unsigned)r*2, (unsigned)r*2, 270 , col);
nk_rawfb_fill_arc(rawfb, xc + wc - r, yc + hc - r,
(unsigned)r*2, (unsigned)r*2, 180 , col);
}
}
static void
nk_rawfb_fill_triangle(const struct rawfb_context *rawfb,
const short x0,
const short y0,
const short x1,
const short y1,
const short x2,
const short y2,
const struct nk_color col)
{
struct nk_vec2i pnts[3];
pnts[0].x = x0;
pnts[0].y = y0;
pnts[1].x = x1;
pnts[1].y = y1;
pnts[2].x = x2;
pnts[2].y = y2;
nk_rawfb_fill_polygon(rawfb, pnts, 3, col);
}
static void
nk_rawfb_stroke_triangle(const struct rawfb_context *rawfb,
const short x0,
const short y0,
const short x1,
const short y1,
const short x2,
const short y2,
const unsigned short line_thickness,
const struct nk_color col)
{
nk_rawfb_stroke_line(rawfb, x0, y0, x1, y1, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x1, y1, x2, y2, line_thickness, col);
nk_rawfb_stroke_line(rawfb, x2, y2, x0, y0, line_thickness, col);
}
static void
nk_rawfb_stroke_polygon(const struct rawfb_context *rawfb,
const struct nk_vec2i *pnts,
const int count,
const unsigned short line_thickness,
const struct nk_color col)
{
int i;
for (i = 1; i < count; ++i)
nk_rawfb_stroke_line(rawfb, pnts[i-1].x, pnts[i-1].y, pnts[i].x,
pnts[i].y, line_thickness, col);
nk_rawfb_stroke_line(rawfb, pnts[count-1].x, pnts[count-1].y,
pnts[0].x, pnts[0].y, line_thickness, col);
}
static void
nk_rawfb_stroke_polyline(const struct rawfb_context *rawfb,
const struct nk_vec2i *pnts,
const int count,
const unsigned short line_thickness,
const struct nk_color col)
{
int i;
for (i = 0; i < count-1; ++i)
nk_rawfb_stroke_line(rawfb, pnts[i].x, pnts[i].y,
pnts[i+1].x, pnts[i+1].y, line_thickness, col);
}
static void
nk_rawfb_fill_circle(const struct rawfb_context *rawfb,
short x0,
short y0,
short w,
short h,
const struct nk_color col)
{
/* Bresenham's ellipses */
const int a2 = (w * w) / 4;
const int b2 = (h * h) / 4;
const int fa2 = 4 * a2, fb2 = 4 * b2;
int x, y, sigma;
/* Convert upper left to center */
h = (h + 1) / 2;
w = (w + 1) / 2;
x0 += w;
y0 += h;
/* First half */
for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) {
nk_rawfb_stroke_line(rawfb, x0 - x, y0 + y, x0 + x, y0 + y, 1, col);
nk_rawfb_stroke_line(rawfb, x0 - x, y0 - y, x0 + x, y0 - y, 1, col);
if (sigma >= 0) {
sigma += fa2 * (1 - y);
y--;
}
sigma += b2 * ((4 * x) + 6);
}
/* Second half */
for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) {
nk_rawfb_stroke_line(rawfb, x0 - x, y0 + y, x0 + x, y0 + y, 1, col);
nk_rawfb_stroke_line(rawfb, x0 - x, y0 - y, x0 + x, y0 - y, 1, col);
if (sigma >= 0) {
sigma += fb2 * (1 - x);
x--;
}
sigma += a2 * ((4 * y) + 6);
}
}
static void
nk_rawfb_stroke_circle(const struct rawfb_context *rawfb,
short x0,
short y0,
short w,
short h,
const short line_thickness,
const struct nk_color col)
{
/* Bresenham's ellipses */
const int a2 = (w * w) / 4;
const int b2 = (h * h) / 4;
const int fa2 = 4 * a2, fb2 = 4 * b2;
int x, y, sigma;
/* Convert upper left to center */
h = (h + 1) / 2;
w = (w + 1) / 2;
x0 += w;
y0 += h;
/* First half */
for (x = 0, y = h, sigma = 2*b2+a2*(1-2*h); b2*x <= a2*y; x++) {
nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col);
nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col);
nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col);
nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col);
if (sigma >= 0) {
sigma += fa2 * (1 - y);
y--;
}
sigma += b2 * ((4 * x) + 6);
}
/* Second half */
for (x = w, y = 0, sigma = 2*a2+b2*(1-2*w); a2*y <= b2*x; y++) {
nk_rawfb_setpixel(rawfb, x0 + x, y0 + y, col);
nk_rawfb_setpixel(rawfb, x0 - x, y0 + y, col);
nk_rawfb_setpixel(rawfb, x0 + x, y0 - y, col);
nk_rawfb_setpixel(rawfb, x0 - x, y0 - y, col);
if (sigma >= 0) {
sigma += fb2 * (1 - x);
x--;
}
sigma += a2 * ((4 * y) + 6);
}
}
static void
nk_rawfb_stroke_curve(const struct rawfb_context *rawfb,
const struct nk_vec2i p1,
const struct nk_vec2i p2,
const struct nk_vec2i p3,
const struct nk_vec2i p4,
const unsigned int num_segments,
const unsigned short line_thickness,
const struct nk_color col)
{
unsigned int i_step, segments;
float t_step;
struct nk_vec2i last = p1;
segments = MAX(num_segments, 1);
t_step = 1.0f/(float)segments;
for (i_step = 1; i_step <= segments; ++i_step) {
float t = t_step * (float)i_step;
float u = 1.0f - t;
float w1 = u*u*u;
float w2 = 3*u*u*t;
float w3 = 3*u*t*t;
float w4 = t * t *t;
float x = w1 * p1.x + w2 * p2.x + w3 * p3.x + w4 * p4.x;
float y = w1 * p1.y + w2 * p2.y + w3 * p3.y + w4 * p4.y;
nk_rawfb_stroke_line(rawfb, last.x, last.y,
(short)x, (short)y, line_thickness,col);
last.x = (short)x; last.y = (short)y;
}
}
static void
nk_rawfb_clear(const struct rawfb_context *rawfb,
const struct nk_color col)
{
nk_rawfb_fill_rect(rawfb, 0, 0, rawfb->fb.w, rawfb->fb.h, 0, col);
}
NK_API struct rawfb_context*
nk_rawfb_init(void *fb,
void *tex_mem,
const unsigned int w,
const unsigned int h,
const unsigned int pitch)
{
const void *tex;
struct rawfb_context *rawfb;
rawfb = malloc(sizeof(struct rawfb_context));
if (!rawfb)
return NULL;
nk_memset(rawfb, 0, sizeof(struct rawfb_context));
rawfb->font_tex.pixels = tex_mem;
rawfb->font_tex.format = NK_FONT_ATLAS_ALPHA8;
rawfb->font_tex.w = 0;
rawfb->font_tex.h = 0;
rawfb->fb.pixels = fb;
rawfb->fb.w= w;
rawfb->fb.h = h;
#if defined(RAWFB_XRGB_8888) || defined(RAWFB_RGBX_8888)
rawfb->fb.format = NK_FONT_ATLAS_RGBA32;
rawfb->fb.pitch = pitch;
#else
#error Fixme
#endif
nk_init_default(&rawfb->ctx, 0);
nk_font_atlas_init_default(&rawfb->atlas);
nk_font_atlas_begin(&rawfb->atlas);
tex = nk_font_atlas_bake(&rawfb->atlas, &rawfb->font_tex.w, &rawfb->font_tex.h, rawfb->font_tex.format);
if (!tex)
return 0;
switch(rawfb->font_tex.format) {
case NK_FONT_ATLAS_ALPHA8:
rawfb->font_tex.pitch = rawfb->font_tex.w * 1;
break;
case NK_FONT_ATLAS_RGBA32:
rawfb->font_tex.pitch = rawfb->font_tex.w * 4;
break;
};
/* Store the font texture in tex scratch memory */
memcpy(rawfb->font_tex.pixels, tex, rawfb->font_tex.pitch * rawfb->font_tex.h);
nk_font_atlas_end(&rawfb->atlas, nk_handle_ptr(NULL), NULL);
if (rawfb->atlas.default_font)
nk_style_set_font(&rawfb->ctx, &rawfb->atlas.default_font->handle);
nk_style_load_all_cursors(&rawfb->ctx, rawfb->atlas.cursors);
nk_rawfb_scissor(rawfb, 0, 0, rawfb->fb.w, rawfb->fb.h);
return rawfb;
}
static void
nk_rawfb_stretch_image(const struct rawfb_image *dst,
const struct rawfb_image *src,
const struct nk_rect *dst_rect,
const struct nk_rect *src_rect,
const struct nk_rect *dst_scissors)
{
struct nk_color col;
short i, j;
float xinc = src_rect->w / dst_rect->w;
float yinc = src_rect->h / dst_rect->h;
float xoff = src_rect->x, yoff = src_rect->y;
/* Simple nearest filtering rescaling */
/* TODO: use bilinear filter */
for (j = 0; j < (short)dst_rect->h; j++) {
for (i = 0; i < (short)dst_rect->w; i++) {
if (dst_scissors) {
if (i + (int)(dst_rect->x + 0.5f) < dst_scissors->x || i + (int)(dst_rect->x + 0.5f) >= dst_scissors->w)
continue;
if (j + (int)(dst_rect->y + 0.5f) < dst_scissors->y || j + (int)(dst_rect->y + 0.5f) >= dst_scissors->h)
continue;
}
col = nk_image_getpixel(src, (int)xoff, (int) yoff);
nk_image_blendpixel(dst, i + (int)(dst_rect->x + 0.5f), j + (int)(dst_rect->y + 0.5f), col);
xoff += xinc;
}
xoff = src_rect->x;
yoff += yinc;
}
}
static void
nk_rawfb_font_query_font_glyph(nk_handle handle,
const float height,
struct nk_user_font_glyph *glyph,
const nk_rune codepoint,
const nk_rune next_codepoint)
{
float scale;
const struct nk_font_glyph *g;
struct nk_font *font;
NK_ASSERT(glyph);
NK_UNUSED(next_codepoint);
font = (struct nk_font*)handle.ptr;
NK_ASSERT(font);
NK_ASSERT(font->glyphs);
if (!font || !glyph)
return;
scale = height/font->info.height;
g = nk_font_find_glyph(font, codepoint);
glyph->width = (g->x1 - g->x0) * scale;
glyph->height = (g->y1 - g->y0) * scale;
glyph->offset = nk_vec2(g->x0 * scale, g->y0 * scale);
glyph->xadvance = (g->xadvance * scale);
glyph->uv[0] = nk_vec2(g->u0, g->v0);
glyph->uv[1] = nk_vec2(g->u1, g->v1);
}
NK_API void
nk_rawfb_draw_text(const struct rawfb_context *rawfb,
const struct nk_user_font *font,
const struct nk_rect rect,
const char *text,
const int len,
const float font_height,
const struct nk_color fg)
{
float x = 0;
int text_len = 0;
nk_rune unicode = 0;
nk_rune next = 0;
int glyph_len = 0;
int next_glyph_len = 0;
struct nk_user_font_glyph g;
if (!len || !text) return;
x = 0;
glyph_len = nk_utf_decode(text, &unicode, len);
if (!glyph_len) return;
/* draw every glyph image */
while (text_len < len && glyph_len) {
struct nk_rect src_rect;
struct nk_rect dst_rect;
float char_width = 0;
if (unicode == NK_UTF_INVALID) break;
/* query currently drawn glyph information */
next_glyph_len = nk_utf_decode(text + text_len + glyph_len, &next, (int)len - text_len);
nk_rawfb_font_query_font_glyph(font->userdata, font_height, &g, unicode,
(next == NK_UTF_INVALID) ? '\0' : next);
/* calculate and draw glyph drawing rectangle and image */
char_width = g.xadvance;
src_rect.x = g.uv[0].x * rawfb->font_tex.w;
src_rect.y = g.uv[0].y * rawfb->font_tex.h;
src_rect.w = g.uv[1].x * rawfb->font_tex.w - g.uv[0].x * rawfb->font_tex.w;
src_rect.h = g.uv[1].y * rawfb->font_tex.h - g.uv[0].y * rawfb->font_tex.h;
dst_rect.x = x + g.offset.x + rect.x;
dst_rect.y = g.offset.y + rect.y;
dst_rect.w = ceilf(g.width);
dst_rect.h = ceilf(g.height);
/* TODO: account fg */
/* Use software rescaling to blit glyph from font_text to framebuffer */
nk_rawfb_stretch_image(&rawfb->fb, &rawfb->font_tex, &dst_rect, &src_rect, &rawfb->scissors);
/* offset next glyph */
text_len += glyph_len;
x += char_width;
glyph_len = next_glyph_len;
unicode = next;
}
}
NK_API void
nk_rawfb_drawimage(const struct rawfb_context *rawfb,
const int x,
const int y,
const int w,
const int h,
const struct nk_image *img,
const struct nk_color *col)
{
struct nk_rect src_rect;
struct nk_rect dst_rect;
src_rect.x = img->region[0];
src_rect.y = img->region[1];
src_rect.w = img->region[2];
src_rect.h = img->region[3];
dst_rect.x = x;
dst_rect.y = y;
dst_rect.w = w;
dst_rect.h = h;
nk_rawfb_stretch_image(&rawfb->fb, &rawfb->font_tex, &dst_rect, &src_rect, &rawfb->scissors);
}
NK_API void
nk_rawfb_shutdown(struct rawfb_context *rawfb)
{
nk_free(&rawfb->ctx);
nk_memset(rawfb, 0, sizeof(struct rawfb_context));
free(rawfb);
}
NK_API void
nk_rawfb_resize_fb(struct rawfb_context *rawfb,
void *fb,
const unsigned int w,
const unsigned int h,
const unsigned int pitch)
{
rawfb->fb.w = w;
rawfb->fb.h = h;
rawfb->fb.pixels = fb;
rawfb->fb.pitch = pitch;
}
NK_API void
nk_rawfb_render(const struct rawfb_context *rawfb,
const struct nk_color clear,
const unsigned char enable_clear)
{
const struct nk_command *cmd;
if (enable_clear)
nk_rawfb_clear(rawfb, clear);
nk_foreach(cmd, (struct nk_context*)&rawfb->ctx) {
switch (cmd->type) {
case NK_COMMAND_NOP: break;
case NK_COMMAND_SCISSOR: {
const struct nk_command_scissor *s =(const struct nk_command_scissor*)cmd;
nk_rawfb_scissor((struct rawfb_context *)rawfb, s->x, s->y, s->w, s->h);
} break;
case NK_COMMAND_LINE: {
const struct nk_command_line *l = (const struct nk_command_line *)cmd;
nk_rawfb_stroke_line(rawfb, l->begin.x, l->begin.y, l->end.x,
l->end.y, l->line_thickness, l->color);
} break;
case NK_COMMAND_RECT: {
const struct nk_command_rect *r = (const struct nk_command_rect *)cmd;
nk_rawfb_stroke_rect(rawfb, r->x, r->y, r->w, r->h,
(unsigned short)r->rounding, r->line_thickness, r->color);
} break;
case NK_COMMAND_RECT_FILLED: {
const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled *)cmd;
nk_rawfb_fill_rect(rawfb, r->x, r->y, r->w, r->h,
(unsigned short)r->rounding, r->color);
} break;
case NK_COMMAND_CIRCLE: {
const struct nk_command_circle *c = (const struct nk_command_circle *)cmd;
nk_rawfb_stroke_circle(rawfb, c->x, c->y, c->w, c->h, c->line_thickness, c->color);
} break;
case NK_COMMAND_CIRCLE_FILLED: {
const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
nk_rawfb_fill_circle(rawfb, c->x, c->y, c->w, c->h, c->color);
} break;
case NK_COMMAND_TRIANGLE: {
const struct nk_command_triangle*t = (const struct nk_command_triangle*)cmd;
nk_rawfb_stroke_triangle(rawfb, t->a.x, t->a.y, t->b.x, t->b.y,
t->c.x, t->c.y, t->line_thickness, t->color);
} break;
case NK_COMMAND_TRIANGLE_FILLED: {
const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled *)cmd;
nk_rawfb_fill_triangle(rawfb, t->a.x, t->a.y, t->b.x, t->b.y,
t->c.x, t->c.y, t->color);
} break;
case NK_COMMAND_POLYGON: {
const struct nk_command_polygon *p =(const struct nk_command_polygon*)cmd;
nk_rawfb_stroke_polygon(rawfb, p->points, p->point_count, p->line_thickness,p->color);
} break;
case NK_COMMAND_POLYGON_FILLED: {
const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled *)cmd;
nk_rawfb_fill_polygon(rawfb, p->points, p->point_count, p->color);
} break;
case NK_COMMAND_POLYLINE: {
const struct nk_command_polyline *p = (const struct nk_command_polyline *)cmd;
nk_rawfb_stroke_polyline(rawfb, p->points, p->point_count, p->line_thickness, p->color);
} break;
case NK_COMMAND_TEXT: {
const struct nk_command_text *t = (const struct nk_command_text*)cmd;
nk_rawfb_draw_text(rawfb, t->font, nk_rect(t->x, t->y, t->w, t->h),
t->string, t->length, t->height, t->foreground);
} break;
case NK_COMMAND_CURVE: {
const struct nk_command_curve *q = (const struct nk_command_curve *)cmd;
nk_rawfb_stroke_curve(rawfb, q->begin, q->ctrl[0], q->ctrl[1],
q->end, 22, q->line_thickness, q->color);
} break;
case NK_COMMAND_RECT_MULTI_COLOR:
case NK_COMMAND_IMAGE: {
const struct nk_command_image *q = (const struct nk_command_image *)cmd;
nk_rawfb_drawimage(rawfb, q->x, q->y, q->w, q->h, &q->img, &q->col);
} break;
case NK_COMMAND_ARC: {
assert(0 && "NK_COMMAND_ARC not implemented\n");
} break;
case NK_COMMAND_ARC_FILLED: {
assert(0 && "NK_COMMAND_ARC_FILLED not implemented\n");
} break;
default: break;
}
}
nk_clear((struct nk_context*)&rawfb->ctx);
}
#endif
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