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ugui/ugui.c

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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <math.h>
#include "ugui.h"
#define SALT 0xbabb0cac
#define DEF_SCALE 1.0
#define DEF_PPI 96.0
#define STACK_STEP 64
#define PPI_PPM(ppi, scale) (ppi * scale * 0.03937008)
#define PPI_PPD(ppi, scale) (PPI_PPM(ppi, scale) * 0.3528)
#define IS_VALID_UNIT(u) (u==UG_UNIT_PX||u==UG_UNIT_MM||u==UG_UNIT_PT)
#define UG_ERR(...) err(errno, "__FUNCTION__: " __VA_ARGS__)
#define BETWEEN(x, min, max) (x <= max && x >= min)
#define INTERSECTS(v, r) (BETWEEN(v.x, r.x, r.x+r.w) && BETWEEN(v.y, r.y, r.y+r.h))
#define CAP(x, s) { if (x < s) x = s; }
// default style
// TODO: fill default style
static const ug_style_t default_style = {
.text = {
.color = RGB_FORMAT(0xffffff),
.alt_color = RGB_FORMAT(0xbbbbbb),
.size = SIZE_PX(16),
.alt_size = SIZE_PX(12),
},
.cnt = {
.bg_color = RGB_FORMAT(0x0000ff),
.border.t = SIZE_PX(3),
.border.b = SIZE_PX(3),
.border.l = SIZE_PX(3),
.border.r = SIZE_PX(3),
.border.color = RGB_FORMAT(0x00ff00),
.titlebar.height = SIZE_PX(20),
.titlebar.bg_color = RGB_FORMAT(0xbababa),
},
};
static const ug_vec2_t max_size = {{10e6}, {10e6}};
static ug_style_t style_cache = {0};
/*=============================================================================*
* Common Functions *
*=============================================================================*/
// grow a stack
#define GROW_STACK(S) \
{ \
S.items = realloc(S.items, (S.size+STACK_STEP)*sizeof(*(S.items))); \
if(!S.items) \
UG_ERR("Could not allocate stack #S: %s", strerror(errno)); \
memset(&(S.items[S.size]), 0, STACK_STEP*sizeof(*(S.items))); \
S.size += STACK_STEP; \
}
#define GET_FROM_STACK(S, c) \
{ \
if (S.idx >= S.size) \
GROW_STACK(S); \
c = &(S.items[S.idx++]); \
}
#define RESET_STACK(S) \
{ \
memset(S.items, 0, S.idx*sizeof(*(S.items))); \
S.idx = 0; \
}
#define MOUSEDOWN(ctx, btn) (ctx->mouse.press_mask & ctx->mouse.down_mask & btn)
#define MOUSEUP(ctx, btn) (ctx->mouse.press_mask & ~ctx->mouse.down_mask & btn)
// https://en.wikipedia.org/wiki/Jenkins_hash_function
static ug_id_t hash(const void *data, unsigned int size)
{
if (!size)
return 0;
ug_id_t hash = SALT;
unsigned char *v = (unsigned char *)data;
for (; size; size--) {
hash += v[size-1];
hash += hash << 10;
hash ^= hash >> 6;
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
return hash;
}
// update the style cache with the correct sizes in pixels and colors
static void update_style_cache(ug_ctx_t *ctx)
{
const ug_style_t *s = ctx->style;
// FIME: use the correct units and convert, for now assume default style
style_cache = *s;
}
void push_rect_command(ug_ctx_t *ctx, const ug_rect_t *rect, ug_color_t color)
{
ug_cmd_t *c;
GET_FROM_STACK(ctx->cmd_stack, c);
c->type = UG_CMD_RECT;
c->rect.x = rect->x;
c->rect.y = rect->y;
c->rect.w = rect->w;
c->rect.h = rect->h;
c->rect.color = color;
}
/*=============================================================================*
* Context Operations *
*=============================================================================*/
// creates a new context, fills with default values, ctx is ready for ug_start()
ug_ctx_t *ug_ctx_new(void)
{
ug_ctx_t *ctx = malloc(sizeof(ug_ctx_t));
if (!ctx)
err(errno, "__FUNCTION__:" "Could not allocate context: %s", strerror(errno));
memset(ctx, 0, sizeof(ug_ctx_t));
ctx->unit = UG_UNIT_PX;
ctx->style = &default_style;
ctx->style_px = &style_cache;
ug_ctx_set_displayinfo(ctx, DEF_SCALE, DEF_PPI);
// TODO: allocate stacks
return ctx;
}
void ug_ctx_free(ug_ctx_t *ctx)
{
if (!ctx) {
warn("__FUNCTION__:" "Trying to free a null context");
return;
}
free(ctx->cmd_stack.items);
free(ctx->cnt_stack.items);
free(ctx);
// NOTE: do not free style since the default is statically allocated, let
// the user take care of it instead
}
#define TEST_CTX(ctx) { if (!ctx) return -1; }
int ug_ctx_set_displayinfo(ug_ctx_t *ctx, float scale, float ppi)
{
TEST_CTX(ctx);
if (scale <= 0 || ppi < 20.0)
return -1;
ctx->last_ppi = ctx->ppi;
ctx->last_ppm = ctx->ppd;
ctx->last_ppd = ctx->ppm;
ctx->ppm = PPI_PPM(scale, ppi);
ctx->ppd = PPI_PPM(scale, ppi);
ctx->ppi = ppi;
update_style_cache(ctx);
return 0;
}
int ug_ctx_set_drawableregion(ug_ctx_t *ctx, ug_vec2_t size)
{
TEST_CTX(ctx);
if (size.w <= 0 || size.h <= 0)
return -1;
ctx->size.w = size.w;
ctx->size.h = size.h;
// FIXME: do I need to do something like update_container_size() here?
// maybe it is redundant since each frame not every conatiner is
// re-added
return 0;
}
int ug_ctx_set_style(ug_ctx_t *ctx, const ug_style_t *style)
{
TEST_CTX(ctx);
if (!style)
return -1;
// TODO: validate style
ctx->style = style;
update_style_cache(ctx);
return 0;
}
int ug_ctx_set_unit(ug_ctx_t *ctx, ug_unit_t unit)
{
TEST_CTX(ctx);
if (!IS_VALID_UNIT(unit))
return -1;
ctx->unit = unit;
return 0;
}
/*=============================================================================*
* Container Operations *
*=============================================================================*/
// get a new or existing container handle
static ug_container_t *get_container(ug_ctx_t *ctx, ug_id_t id)
{
ug_container_t *c = NULL;
for (int i = 0; i < ctx->cnt_stack.idx; i++) {
if (ctx->cnt_stack.items[i].id == id) {
c = &(ctx->cnt_stack.items[i]);
break;
}
}
// if the container was not already there allocate a new one
if (!c)
GET_FROM_STACK(ctx->cnt_stack, c);
return c;
}
// update the container dimensions and position according to the context information,
// also handle resizing, moving, ect. if allowed by the container
static void update_container(ug_ctx_t *ctx, ug_container_t *cnt)
{
// if the container is new it has never been converted to pixels
if (cnt->unit != UG_UNIT_PX) {
float scale = 1.0;
switch (ctx->unit) {
case UG_UNIT_MM: scale = ctx->ppm; break;
case UG_UNIT_PT: scale = ctx->ppd; break;
default: break;
}
cnt->rect.x = roundf(cnt->rect.fx * scale);
cnt->rect.y = roundf(cnt->rect.fy * scale);
cnt->rect.w = roundf(cnt->rect.fw * scale);
cnt->rect.h = roundf(cnt->rect.fh * scale);
cnt->unit = UG_UNIT_PX;
} else if (ctx->ppi != ctx->last_ppi) {
// if the scale has been updated than we need to scale the container
// as well
float scale = ctx->ppi / ctx->last_ppi;
cnt->rect.x = roundf(cnt->rect.x * scale);
cnt->rect.y = roundf(cnt->rect.y * scale);
cnt->rect.w = roundf(cnt->rect.w * scale);
cnt->rect.h = roundf(cnt->rect.h * scale);
}
cnt->rca = cnt->rect;
/*
* Container style:
*
* rca
* v
* +-----------------------------------------------+
* | Titlebar |
* +-----------------------------------------------+
* |+---------------------------------------------+|
* ||\ ^ Border Top ^ ||
* || \_ rect(0,0) ||
* || ||
* || ||
* || ||
* || ||
* || ||
* || ||
* || ||
* || < Border Left ||
* || Border Right > ||
* || ||
* || ||
* || ||
* || ||
* |+---------------------------------------------+|
* +-----------------------------------------------+
* ^ Border Bottom ^
*/
const ug_style_t *s = ctx->style_px;
int bl = s->cnt.border.l.size;
int br = s->cnt.border.r.size;
int bt = s->cnt.border.t.size;
int bb = s->cnt.border.b.size;
int hh = s->cnt.titlebar.height.size;
int cw = ctx->size.w;
int ch = ctx->size.h;
// 0 -> take all the space, <0 -> take absolute
if (cnt->rect.w < 0) cnt->rca.w = -cnt->rect.w;
if (cnt->rect.h < 0) cnt->rca.h = -cnt->rect.h;
// handle relative position
// and move to fit borders
if (cnt->rect.w == 0) cnt->rca.w = cw - br - bl;
else cnt->rca.w += bl + br;
if (cnt->rect.h == 0) cnt->rca.h = ch - bt - bb;
else if (cnt->flags & UG_CNT_MOVABLE) cnt->rca.h += hh + 2*bt + bb;
else cnt->rca.h += bt + bb;
// the window may have been resized so cap the position to the window size
// FIXME: is MAX(cw - bl, 0) better?
if (cnt->rect.x > cw) cnt->rca.x = cw;
if (cnt->rect.y > ch) cnt->rca.y = ch;
// <0 -> relative to the right margin
if (cnt->rect.x < 0) cnt->rca.x = cw - cnt->rca.w + cnt->rca.x;
if (cnt->rect.y < 0) cnt->rca.y = ch - cnt->rca.h + cnt->rca.y;
// if we had focus the frame before, then do shit
if (ctx->hover.cnt_last != cnt->id)
goto cnt_draw;
// mouse pressed handle resize, for simplicity containers can only
// be resized from the bottom and right border
// TODO: bring selected container to the top of the stack
if (!(ctx->mouse.down_mask & UG_BTN_LEFT) ||
!(cnt->flags & (UG_CNT_RESIZABLE | UG_CNT_MOVABLE)))
goto cnt_draw;
ug_vec2_t mpos = ctx->mouse.pos;
int minx, maxx, miny, maxy;
// handle movable windows
if (cnt->flags & UG_CNT_MOVABLE) {
minx = cnt->rca.x;
maxx = cnt->rca.x + cnt->rca.w - br;
miny = cnt->rca.y;
maxy = cnt->rca.y + bt + hh;
if (BETWEEN(mpos.x, minx, maxx) && BETWEEN(mpos.y, miny, maxy)) {
cnt->rect.x += ctx->mouse.delta.x;
cnt->rect.y += ctx->mouse.delta.y;
cnt->rca.x += ctx->mouse.delta.x;
cnt->rca.y += ctx->mouse.delta.y;
}
}
if (cnt->flags & UG_CNT_RESIZABLE) {
// right border resize
minx = cnt->rca.x + cnt->rca.w - br;
maxx = cnt->rca.x + cnt->rca.w;
miny = cnt->rca.y;
maxy = cnt->rca.y + cnt->rca.h;
if (BETWEEN(mpos.x, minx, maxx) && BETWEEN(mpos.y, miny, maxy)) {
cnt->rect.w += ctx->mouse.delta.x;
cnt->rca.w += ctx->mouse.delta.x;
}
// bottom border resize
minx = cnt->rca.x;
maxx = cnt->rca.x + cnt->rca.w;
miny = cnt->rca.y + cnt->rca.h - bb;
maxy = cnt->rca.y + cnt->rca.h;
if (BETWEEN(mpos.x, minx, maxx) && BETWEEN(mpos.y, miny, maxy)) {
cnt->rect.h += ctx->mouse.delta.y;
cnt->rca.h += ctx->mouse.delta.y;
}
}
// TODO: what if I want to close a floating container?
// Maybe add a UG_CNT_CLOSABLE flag?
// TODO: what about scrolling? how do we know if we need to draw
// a scroll bar? Maybe add that information inside the
// container structure
// push the appropriate rectangles to the drawing stack
ug_rect_t draw_rect;
cnt_draw:
// push outline
draw_rect = cnt->rca;
push_rect_command(ctx, &draw_rect, s->cnt.border.color);
// titlebar
if (cnt->flags & UG_CNT_MOVABLE) {
draw_rect.x += bl;
draw_rect.y += bt;
draw_rect.w -= bl + br;
draw_rect.h = hh;
push_rect_command(ctx, &draw_rect, s->cnt.titlebar.bg_color);
}
// push main body
draw_rect = cnt->rca;
draw_rect.x += bl;
draw_rect.y += bt;
draw_rect.w -= bl + br;
draw_rect.h -= bt + bb;
if (cnt->flags & UG_CNT_MOVABLE) {
draw_rect.y += bt + hh;
draw_rect.h -= bt + hh;
}
push_rect_command(ctx, &draw_rect, s->cnt.bg_color);
// TODO: push other rects
}
// a floating container can be placed anywhere and can be resized, acts like a
// window inside another window
int ug_container_floating(ug_ctx_t *ctx, const char *name, ug_rect_t rect)
{
TEST_CTX(ctx);
// TODO: verify rect
ug_id_t id = name ? hash(name, strlen(name)) : hash(&rect, sizeof(ug_rect_t));
ug_container_t *cnt = get_container(ctx, id);
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->rect = rect;
cnt->unit = ctx->unit;
cnt->flags = UG_CNT_MOVABLE | UG_CNT_RESIZABLE |
UG_CNT_SCROLL_X | UG_CNT_SCROLL_Y ;
}
update_container(ctx, cnt);
return 0;
}
/*=============================================================================*
* Input Handling *
*=============================================================================*/
int ug_input_mousemove(ug_ctx_t *ctx, int x, int y)
{
TEST_CTX(ctx)
if (x < 0 || y < 0)
return 0;
ctx->mouse.pos = (ug_vec2_t){.x = x, .y = y};
return 0;
}
int ug_input_mousedown(ug_ctx_t *ctx, unsigned int mask)
{
TEST_CTX(ctx);
ctx->mouse.press_mask |= mask;
ctx->mouse.down_mask |= mask;
return 0;
}
int ug_input_mouseup(ug_ctx_t *ctx, unsigned int mask)
{
TEST_CTX(ctx);
ctx->mouse.down_mask &= ~mask;
return 0;
}
/*=============================================================================*
* Frame Handling *
*=============================================================================*/
// At the beginning of a frame assume that all input has been passed to the context
// update the mouse delta and reset the command stack
int ug_frame_begin(ug_ctx_t *ctx)
{
TEST_CTX(ctx);
// TODO: add a way to mark a container for removal from the stack, and then
// remove it here to save space
// update mouse delta
ctx->mouse.delta.x = ctx->mouse.pos.x - ctx->mouse.last_pos.x;
ctx->mouse.delta.y = ctx->mouse.pos.y - ctx->mouse.last_pos.y;
// clear command stack
RESET_STACK(ctx->cmd_stack);
// update hover index
ug_vec2_t v = ctx->mouse.pos;
// printf("mouse: x=%d, y=%d\n", ctx->mouse.pos.x, ctx->mouse.pos.x);
for (int i = 0; i < ctx->cnt_stack.idx; i++) {
ug_rect_t r = ctx->cnt_stack.items[i].rca;
if (INTERSECTS(v, r)) {
ctx->hover.cnt = ctx->cnt_stack.items[i].id;
// printf("intersects! %.8x\n", ctx->hover.cnt);
}
}
return 0;
}
// At the end of a frame reset inputs
int ug_frame_end(ug_ctx_t *ctx)
{
TEST_CTX(ctx);
ctx->input_text[0] = '\0';
ctx->key.press_mask = 0;
ctx->mouse.press_mask = 0;
ctx->mouse.scroll_delta = (ug_vec2_t){0};
ctx->mouse.last_pos = ctx->mouse.pos;
// reset hover, it has to be calculated at frame beginning
ctx->hover.cnt_last = ctx->hover.cnt;
ctx->hover.elem_last = ctx->hover.elem;
ctx->hover.cnt = 0;
ctx->hover.elem = 0;
ctx->last_ppi = ctx->ppi;
ctx->last_ppm = ctx->ppm;
ctx->last_ppd = ctx->ppd;
ctx->frame++;
return 0;
}