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draw text

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This commit is contained in:
Alessandro Mauri 2022-12-12 00:40:23 +01:00
parent 7fb9d225a0
commit 4e95aeffc3
7 changed files with 6048 additions and 44 deletions

28
test/main.c
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@ -3,10 +3,16 @@
#include "../ugui.h"
#define STB_RECT_PACK_IMPLEMENTATION
#define STB_TRUETYPE_IMPLEMENTATION
#define STBTTF_IMPLEMENTATION
#include "stbttf.h"
SDL_Window *w;
SDL_Renderer *r;
ug_ctx_t *ctx;
STBTTF_Font *font;
void cleanup(void);
@ -38,7 +44,7 @@ int main(void)
//SDL_Surface *s;
//s = SDL_GetWindowSurface(w);
r = SDL_CreateRenderer(w, -1, SDL_RENDERER_ACCELERATED);
SDL_SetRenderDrawBlendMode(r, SDL_BLENDMODE_BLEND);
ug_vec2_t size, dsize;
SDL_GetWindowSize(w, &size.w, &size.h);
@ -56,6 +62,8 @@ int main(void)
ug_ctx_set_displayinfo(ctx, scale, dpi);
ug_ctx_set_drawableregion(ctx, dsize);
// open font
font = STBTTF_OpenFont(r, "monospace.ttf", ctx->style_px->text.size.size.i);
// atexit(cleanup);
@ -175,7 +183,11 @@ int main(void)
ug_frame_begin(ctx);
if (ctx->frame < 5000) {
ug_container_menu_bar(ctx, "Menu fichissimo", (ug_size_t)SIZE_PX(24));
} else if (ctx->frame == 5000) {
ug_container_remove(ctx, "Menu fichissimo");
}
ug_container_floating(ctx, "stupid name",
(ug_div_t){.x=SIZE_PX(0), .y=SIZE_PX(0), .w=SIZE_PX(100), .h=SIZE_MM(75.0)});
@ -203,6 +215,9 @@ int main(void)
SDL_RenderClear(r);
for (int i = 0; i < ctx->cmd_stack.idx; i++) {
ug_cmd_t cmd = ctx->cmd_stack.items[i];
switch (cmd.type) {
case UG_CMD_RECT:
{
ug_color_t col = cmd.rect.color;
SDL_Rect sr = {
.x = cmd.rect.x,
@ -210,11 +225,17 @@ int main(void)
.w = cmd.rect.w,
.h = cmd.rect.h,
};
//printf("DRAWING: x=%d, y=%d, w=%d, h=%d\n", sr.x, sr.y, sr.w, sr.h);
//printf("COLOR: #%.8X\n", *((unsigned int *)&col));
SDL_SetRenderDrawColor(r, col.r, col.g, col.b, col.a);
SDL_RenderFillRect(r, &sr);
}
break;
case UG_CMD_TEXT:
SDL_SetRenderDrawColor(r, cmd.text.color.r, cmd.text.color.g, cmd.text.color.b, cmd.text.color.a);
STBTTF_RenderText(r, font, cmd.text.x, cmd.text.y, cmd.text.str);
break;
default: break;
}
}
SDL_RenderPresent(r);
} while (event.type != SDL_QUIT);
@ -227,6 +248,7 @@ int main(void)
void cleanup(void)
{
ug_ctx_free(ctx);
STBTTF_CloseFont(font);
SDL_DestroyRenderer(r);
SDL_DestroyWindow(w);
SDL_Quit();

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test/stb_rect_pack.h Normal file
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@ -0,0 +1,623 @@
// stb_rect_pack.h - v1.01 - public domain - rectangle packing
// Sean Barrett 2014
//
// Useful for e.g. packing rectangular textures into an atlas.
// Does not do rotation.
//
// Before #including,
//
// #define STB_RECT_PACK_IMPLEMENTATION
//
// in the file that you want to have the implementation.
//
// Not necessarily the awesomest packing method, but better than
// the totally naive one in stb_truetype (which is primarily what
// this is meant to replace).
//
// Has only had a few tests run, may have issues.
//
// More docs to come.
//
// No memory allocations; uses qsort() and assert() from stdlib.
// Can override those by defining STBRP_SORT and STBRP_ASSERT.
//
// This library currently uses the Skyline Bottom-Left algorithm.
//
// Please note: better rectangle packers are welcome! Please
// implement them to the same API, but with a different init
// function.
//
// Credits
//
// Library
// Sean Barrett
// Minor features
// Martins Mozeiko
// github:IntellectualKitty
//
// Bugfixes / warning fixes
// Jeremy Jaussaud
// Fabian Giesen
//
// Version history:
//
// 1.01 (2021-07-11) always use large rect mode, expose STBRP__MAXVAL in public section
// 1.00 (2019-02-25) avoid small space waste; gracefully fail too-wide rectangles
// 0.99 (2019-02-07) warning fixes
// 0.11 (2017-03-03) return packing success/fail result
// 0.10 (2016-10-25) remove cast-away-const to avoid warnings
// 0.09 (2016-08-27) fix compiler warnings
// 0.08 (2015-09-13) really fix bug with empty rects (w=0 or h=0)
// 0.07 (2015-09-13) fix bug with empty rects (w=0 or h=0)
// 0.06 (2015-04-15) added STBRP_SORT to allow replacing qsort
// 0.05: added STBRP_ASSERT to allow replacing assert
// 0.04: fixed minor bug in STBRP_LARGE_RECTS support
// 0.01: initial release
//
// LICENSE
//
// See end of file for license information.
//////////////////////////////////////////////////////////////////////////////
//
// INCLUDE SECTION
//
#ifndef STB_INCLUDE_STB_RECT_PACK_H
#define STB_INCLUDE_STB_RECT_PACK_H
#define STB_RECT_PACK_VERSION 1
#ifdef STBRP_STATIC
#define STBRP_DEF static
#else
#define STBRP_DEF extern
#endif
#ifdef __cplusplus
extern "C" {
#endif
typedef struct stbrp_context stbrp_context;
typedef struct stbrp_node stbrp_node;
typedef struct stbrp_rect stbrp_rect;
typedef int stbrp_coord;
#define STBRP__MAXVAL 0x7fffffff
// Mostly for internal use, but this is the maximum supported coordinate value.
STBRP_DEF int stbrp_pack_rects (stbrp_context *context, stbrp_rect *rects, int num_rects);
// Assign packed locations to rectangles. The rectangles are of type
// 'stbrp_rect' defined below, stored in the array 'rects', and there
// are 'num_rects' many of them.
//
// Rectangles which are successfully packed have the 'was_packed' flag
// set to a non-zero value and 'x' and 'y' store the minimum location
// on each axis (i.e. bottom-left in cartesian coordinates, top-left
// if you imagine y increasing downwards). Rectangles which do not fit
// have the 'was_packed' flag set to 0.
//
// You should not try to access the 'rects' array from another thread
// while this function is running, as the function temporarily reorders
// the array while it executes.
//
// To pack into another rectangle, you need to call stbrp_init_target
// again. To continue packing into the same rectangle, you can call
// this function again. Calling this multiple times with multiple rect
// arrays will probably produce worse packing results than calling it
// a single time with the full rectangle array, but the option is
// available.
//
// The function returns 1 if all of the rectangles were successfully
// packed and 0 otherwise.
struct stbrp_rect
{
// reserved for your use:
int id;
// input:
stbrp_coord w, h;
// output:
stbrp_coord x, y;
int was_packed; // non-zero if valid packing
}; // 16 bytes, nominally
STBRP_DEF void stbrp_init_target (stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes);
// Initialize a rectangle packer to:
// pack a rectangle that is 'width' by 'height' in dimensions
// using temporary storage provided by the array 'nodes', which is 'num_nodes' long
//
// You must call this function every time you start packing into a new target.
//
// There is no "shutdown" function. The 'nodes' memory must stay valid for
// the following stbrp_pack_rects() call (or calls), but can be freed after
// the call (or calls) finish.
//
// Note: to guarantee best results, either:
// 1. make sure 'num_nodes' >= 'width'
// or 2. call stbrp_allow_out_of_mem() defined below with 'allow_out_of_mem = 1'
//
// If you don't do either of the above things, widths will be quantized to multiples
// of small integers to guarantee the algorithm doesn't run out of temporary storage.
//
// If you do #2, then the non-quantized algorithm will be used, but the algorithm
// may run out of temporary storage and be unable to pack some rectangles.
STBRP_DEF void stbrp_setup_allow_out_of_mem (stbrp_context *context, int allow_out_of_mem);
// Optionally call this function after init but before doing any packing to
// change the handling of the out-of-temp-memory scenario, described above.
// If you call init again, this will be reset to the default (false).
STBRP_DEF void stbrp_setup_heuristic (stbrp_context *context, int heuristic);
// Optionally select which packing heuristic the library should use. Different
// heuristics will produce better/worse results for different data sets.
// If you call init again, this will be reset to the default.
enum
{
STBRP_HEURISTIC_Skyline_default=0,
STBRP_HEURISTIC_Skyline_BL_sortHeight = STBRP_HEURISTIC_Skyline_default,
STBRP_HEURISTIC_Skyline_BF_sortHeight
};
//////////////////////////////////////////////////////////////////////////////
//
// the details of the following structures don't matter to you, but they must
// be visible so you can handle the memory allocations for them
struct stbrp_node
{
stbrp_coord x,y;
stbrp_node *next;
};
struct stbrp_context
{
int width;
int height;
int align;
int init_mode;
int heuristic;
int num_nodes;
stbrp_node *active_head;
stbrp_node *free_head;
stbrp_node extra[2]; // we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2'
};
#ifdef __cplusplus
}
#endif
#endif
//////////////////////////////////////////////////////////////////////////////
//
// IMPLEMENTATION SECTION
//
#ifdef STB_RECT_PACK_IMPLEMENTATION
#ifndef STBRP_SORT
#include <stdlib.h>
#define STBRP_SORT qsort
#endif
#ifndef STBRP_ASSERT
#include <assert.h>
#define STBRP_ASSERT assert
#endif
#ifdef _MSC_VER
#define STBRP__NOTUSED(v) (void)(v)
#define STBRP__CDECL __cdecl
#else
#define STBRP__NOTUSED(v) (void)sizeof(v)
#define STBRP__CDECL
#endif
enum
{
STBRP__INIT_skyline = 1
};
STBRP_DEF void stbrp_setup_heuristic(stbrp_context *context, int heuristic)
{
switch (context->init_mode) {
case STBRP__INIT_skyline:
STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight || heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight);
context->heuristic = heuristic;
break;
default:
STBRP_ASSERT(0);
}
}
STBRP_DEF void stbrp_setup_allow_out_of_mem(stbrp_context *context, int allow_out_of_mem)
{
if (allow_out_of_mem)
// if it's ok to run out of memory, then don't bother aligning them;
// this gives better packing, but may fail due to OOM (even though
// the rectangles easily fit). @TODO a smarter approach would be to only
// quantize once we've hit OOM, then we could get rid of this parameter.
context->align = 1;
else {
// if it's not ok to run out of memory, then quantize the widths
// so that num_nodes is always enough nodes.
//
// I.e. num_nodes * align >= width
// align >= width / num_nodes
// align = ceil(width/num_nodes)
context->align = (context->width + context->num_nodes-1) / context->num_nodes;
}
}
STBRP_DEF void stbrp_init_target(stbrp_context *context, int width, int height, stbrp_node *nodes, int num_nodes)
{
int i;
for (i=0; i < num_nodes-1; ++i)
nodes[i].next = &nodes[i+1];
nodes[i].next = NULL;
context->init_mode = STBRP__INIT_skyline;
context->heuristic = STBRP_HEURISTIC_Skyline_default;
context->free_head = &nodes[0];
context->active_head = &context->extra[0];
context->width = width;
context->height = height;
context->num_nodes = num_nodes;
stbrp_setup_allow_out_of_mem(context, 0);
// node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly)
context->extra[0].x = 0;
context->extra[0].y = 0;
context->extra[0].next = &context->extra[1];
context->extra[1].x = (stbrp_coord) width;
context->extra[1].y = (1<<30);
context->extra[1].next = NULL;
}
// find minimum y position if it starts at x1
static int stbrp__skyline_find_min_y(stbrp_context *c, stbrp_node *first, int x0, int width, int *pwaste)
{
stbrp_node *node = first;
int x1 = x0 + width;
int min_y, visited_width, waste_area;
STBRP__NOTUSED(c);
STBRP_ASSERT(first->x <= x0);
#if 0
// skip in case we're past the node
while (node->next->x <= x0)
++node;
#else
STBRP_ASSERT(node->next->x > x0); // we ended up handling this in the caller for efficiency
#endif
STBRP_ASSERT(node->x <= x0);
min_y = 0;
waste_area = 0;
visited_width = 0;
while (node->x < x1) {
if (node->y > min_y) {
// raise min_y higher.
// we've accounted for all waste up to min_y,
// but we'll now add more waste for everything we've visted
waste_area += visited_width * (node->y - min_y);
min_y = node->y;
// the first time through, visited_width might be reduced
if (node->x < x0)
visited_width += node->next->x - x0;
else
visited_width += node->next->x - node->x;
} else {
// add waste area
int under_width = node->next->x - node->x;
if (under_width + visited_width > width)
under_width = width - visited_width;
waste_area += under_width * (min_y - node->y);
visited_width += under_width;
}
node = node->next;
}
*pwaste = waste_area;
return min_y;
}
typedef struct
{
int x,y;
stbrp_node **prev_link;
} stbrp__findresult;
static stbrp__findresult stbrp__skyline_find_best_pos(stbrp_context *c, int width, int height)
{
int best_waste = (1<<30), best_x, best_y = (1 << 30);
stbrp__findresult fr;
stbrp_node **prev, *node, *tail, **best = NULL;
// align to multiple of c->align
width = (width + c->align - 1);
width -= width % c->align;
STBRP_ASSERT(width % c->align == 0);
// if it can't possibly fit, bail immediately
if (width > c->width || height > c->height) {
fr.prev_link = NULL;
fr.x = fr.y = 0;
return fr;
}
node = c->active_head;
prev = &c->active_head;
while (node->x + width <= c->width) {
int y,waste;
y = stbrp__skyline_find_min_y(c, node, node->x, width, &waste);
if (c->heuristic == STBRP_HEURISTIC_Skyline_BL_sortHeight) { // actually just want to test BL
// bottom left
if (y < best_y) {
best_y = y;
best = prev;
}
} else {
// best-fit
if (y + height <= c->height) {
// can only use it if it first vertically
if (y < best_y || (y == best_y && waste < best_waste)) {
best_y = y;
best_waste = waste;
best = prev;
}
}
}
prev = &node->next;
node = node->next;
}
best_x = (best == NULL) ? 0 : (*best)->x;
// if doing best-fit (BF), we also have to try aligning right edge to each node position
//
// e.g, if fitting
//
// ____________________
// |____________________|
//
// into
//
// | |
// | ____________|
// |____________|
//
// then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned
//
// This makes BF take about 2x the time
if (c->heuristic == STBRP_HEURISTIC_Skyline_BF_sortHeight) {
tail = c->active_head;
node = c->active_head;
prev = &c->active_head;
// find first node that's admissible
while (tail->x < width)
tail = tail->next;
while (tail) {
int xpos = tail->x - width;
int y,waste;
STBRP_ASSERT(xpos >= 0);
// find the left position that matches this
while (node->next->x <= xpos) {
prev = &node->next;
node = node->next;
}
STBRP_ASSERT(node->next->x > xpos && node->x <= xpos);
y = stbrp__skyline_find_min_y(c, node, xpos, width, &waste);
if (y + height <= c->height) {
if (y <= best_y) {
if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
best_x = xpos;
STBRP_ASSERT(y <= best_y);
best_y = y;
best_waste = waste;
best = prev;
}
}
}
tail = tail->next;
}
}
fr.prev_link = best;
fr.x = best_x;
fr.y = best_y;
return fr;
}
static stbrp__findresult stbrp__skyline_pack_rectangle(stbrp_context *context, int width, int height)
{
// find best position according to heuristic
stbrp__findresult res = stbrp__skyline_find_best_pos(context, width, height);
stbrp_node *node, *cur;
// bail if:
// 1. it failed
// 2. the best node doesn't fit (we don't always check this)
// 3. we're out of memory
if (res.prev_link == NULL || res.y + height > context->height || context->free_head == NULL) {
res.prev_link = NULL;
return res;
}
// on success, create new node
node = context->free_head;
node->x = (stbrp_coord) res.x;
node->y = (stbrp_coord) (res.y + height);
context->free_head = node->next;
// insert the new node into the right starting point, and
// let 'cur' point to the remaining nodes needing to be
// stiched back in
cur = *res.prev_link;
if (cur->x < res.x) {
// preserve the existing one, so start testing with the next one
stbrp_node *next = cur->next;
cur->next = node;
cur = next;
} else {
*res.prev_link = node;
}
// from here, traverse cur and free the nodes, until we get to one
// that shouldn't be freed
while (cur->next && cur->next->x <= res.x + width) {
stbrp_node *next = cur->next;
// move the current node to the free list
cur->next = context->free_head;
context->free_head = cur;
cur = next;
}
// stitch the list back in
node->next = cur;
if (cur->x < res.x + width)
cur->x = (stbrp_coord) (res.x + width);
#ifdef _DEBUG
cur = context->active_head;
while (cur->x < context->width) {
STBRP_ASSERT(cur->x < cur->next->x);
cur = cur->next;
}
STBRP_ASSERT(cur->next == NULL);
{
int count=0;
cur = context->active_head;
while (cur) {
cur = cur->next;
++count;
}
cur = context->free_head;
while (cur) {
cur = cur->next;
++count;
}
STBRP_ASSERT(count == context->num_nodes+2);
}
#endif
return res;
}
static int STBRP__CDECL rect_height_compare(const void *a, const void *b)
{
const stbrp_rect *p = (const stbrp_rect *) a;
const stbrp_rect *q = (const stbrp_rect *) b;
if (p->h > q->h)
return -1;
if (p->h < q->h)
return 1;
return (p->w > q->w) ? -1 : (p->w < q->w);
}
static int STBRP__CDECL rect_original_order(const void *a, const void *b)
{
const stbrp_rect *p = (const stbrp_rect *) a;
const stbrp_rect *q = (const stbrp_rect *) b;
return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
}
STBRP_DEF int stbrp_pack_rects(stbrp_context *context, stbrp_rect *rects, int num_rects)
{
int i, all_rects_packed = 1;
// we use the 'was_packed' field internally to allow sorting/unsorting
for (i=0; i < num_rects; ++i) {
rects[i].was_packed = i;
}
// sort according to heuristic
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_height_compare);
for (i=0; i < num_rects; ++i) {
if (rects[i].w == 0 || rects[i].h == 0) {
rects[i].x = rects[i].y = 0; // empty rect needs no space
} else {
stbrp__findresult fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
if (fr.prev_link) {
rects[i].x = (stbrp_coord) fr.x;
rects[i].y = (stbrp_coord) fr.y;
} else {
rects[i].x = rects[i].y = STBRP__MAXVAL;
}
}
}
// unsort
STBRP_SORT(rects, num_rects, sizeof(rects[0]), rect_original_order);
// set was_packed flags and all_rects_packed status
for (i=0; i < num_rects; ++i) {
rects[i].was_packed = !(rects[i].x == STBRP__MAXVAL && rects[i].y == STBRP__MAXVAL);
if (!rects[i].was_packed)
all_rects_packed = 0;
}
// return the all_rects_packed status
return all_rects_packed;
}
#endif
/*
------------------------------------------------------------------------------
This software is available under 2 licenses -- choose whichever you prefer.
------------------------------------------------------------------------------
ALTERNATIVE A - MIT License
Copyright (c) 2017 Sean Barrett
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.
------------------------------------------------------------------------------
ALTERNATIVE B - Public Domain (www.unlicense.org)
This is free and unencumbered software released into the public domain.
Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
software, either in source code form or as a compiled binary, for any purpose,
commercial or non-commercial, and by any means.
In jurisdictions that recognize copyright laws, the author or authors of this
software dedicate any and all copyright interest in the software to the public
domain. We make this dedication for the benefit of the public at large and to
the detriment of our heirs and successors. We intend this dedication to be an
overt act of relinquishment in perpetuity of all present and future rights to
this software under copyright law.
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 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.
------------------------------------------------------------------------------
*/

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#ifndef __STBTTF_H__
#define __STBTTF_H__
#include <SDL2/SDL.h>
#include "stb_rect_pack.h"
#include "stb_truetype.h"
/* STBTTF: A quick and dirty SDL2 text renderer based on stb_truetype and stdb_rect_pack.
* Benoit Favre 2019
*
* This header-only addon to the stb_truetype library allows to draw text with SDL2 from
* TTF fonts with a similar API to SDL_TTF without the bloat.
* The renderer is however limited by the integral positioning of SDL blit functions.
* It also does not parse utf8 text and only prints ASCII characters.
*
* This code is public domain.
*/
typedef struct {
stbtt_fontinfo* info;
stbtt_packedchar* chars;
SDL_Texture* atlas;
int texture_size;
float size;
float scale;
int ascent;
int baseline;
} STBTTF_Font;
/* Release the memory and textures associated with a font */
void STBTTF_CloseFont(STBTTF_Font* font);
/* Open a TTF font given a SDL abstract IO handler, for a given renderer and a given font size.
* Returns NULL on failure. The font must be deallocated with STBTTF_CloseFont when not used anymore.
* This function creates a texture atlas with prerendered ASCII characters (32-128).
*/
STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size);
/* Open a TTF font given a filename, for a given renderer and a given font size.
* Convinience function which calls STBTTF_OpenFontRW.
*/
STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size);
/* Draw some text using the renderer draw color at location (x, y).
* Characters are copied from the texture atlas using the renderer SDL_RenderCopy function.
* Since that function only supports integral coordinates, the result is not great.
* Only ASCII characters (32 <= c < 128) are supported. Anything outside this range is ignored.
*/
void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text);
/* Return the length in pixels of a text.
* You can get the height of a line by using font->baseline.
*/
float STBTTF_MeasureText(STBTTF_Font* font, const char *text);
#ifdef STBTTF_IMPLEMENTATION
void STBTTF_CloseFont(STBTTF_Font* font) {
if(font->atlas) SDL_DestroyTexture(font->atlas);
if(font->info) free(font->info);
if(font->chars) free(font->chars);
free(font);
}
STBTTF_Font* STBTTF_OpenFontRW(SDL_Renderer* renderer, SDL_RWops* rw, float size) {
Sint64 file_size = SDL_RWsize(rw);
unsigned char* buffer = malloc(file_size);
if(SDL_RWread(rw, buffer, file_size, 1) != 1) return NULL;
SDL_RWclose(rw);
STBTTF_Font* font = calloc(sizeof(STBTTF_Font), 1);
font->info = malloc(sizeof(stbtt_fontinfo));
font->chars = malloc(sizeof(stbtt_packedchar) * 96);
if(stbtt_InitFont(font->info, buffer, 0) == 0) {
free(buffer);
STBTTF_CloseFont(font);
return NULL;
}
// fill bitmap atlas with packed characters
unsigned char* bitmap = NULL;
font->texture_size = 32;
while(1) {
bitmap = malloc(font->texture_size * font->texture_size);
stbtt_pack_context pack_context;
stbtt_PackBegin(&pack_context, bitmap, font->texture_size, font->texture_size, 0, 1, 0);
stbtt_PackSetOversampling(&pack_context, 1, 1);
if(!stbtt_PackFontRange(&pack_context, buffer, 0, size, 32, 95, font->chars)) {
// too small
free(bitmap);
stbtt_PackEnd(&pack_context);
font->texture_size *= 2;
} else {
stbtt_PackEnd(&pack_context);
break;
}
}
// convert bitmap to texture
font->atlas = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGBA32, SDL_TEXTUREACCESS_STATIC, font->texture_size, font->texture_size);
SDL_SetTextureBlendMode(font->atlas, SDL_BLENDMODE_BLEND);
Uint32* pixels = malloc(font->texture_size * font->texture_size * sizeof(Uint32));
static SDL_PixelFormat* format = NULL;
if(format == NULL) format = SDL_AllocFormat(SDL_PIXELFORMAT_RGBA32);
for(int i = 0; i < font->texture_size * font->texture_size; i++) {
pixels[i] = SDL_MapRGBA(format, 0xff, 0xff, 0xff, bitmap[i]);
}
SDL_UpdateTexture(font->atlas, NULL, pixels, font->texture_size * sizeof(Uint32));
free(pixels);
free(bitmap);
// setup additional info
font->scale = stbtt_ScaleForPixelHeight(font->info, size);
stbtt_GetFontVMetrics(font->info, &font->ascent, 0, 0);
font->baseline = (int) (font->ascent * font->scale);
free(buffer);
return font;
}
STBTTF_Font* STBTTF_OpenFont(SDL_Renderer* renderer, const char* filename, float size) {
SDL_RWops *rw = SDL_RWFromFile(filename, "rb");
if(rw == NULL) return NULL;
return STBTTF_OpenFontRW(renderer, rw, size);
}
void STBTTF_RenderText(SDL_Renderer* renderer, STBTTF_Font* font, float x, float y, const char *text) {
Uint8 r, g, b, a;
SDL_GetRenderDrawColor(renderer, &r, &g, &b, &a);
SDL_SetTextureColorMod(font->atlas, r, g, b);
SDL_SetTextureAlphaMod(font->atlas, a);
for(int i = 0; text[i]; i++) {
if (text[i] >= 32 && text[i] < 128) {
//if(i > 0) x += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
stbtt_packedchar* info = &font->chars[text[i] - 32];
SDL_Rect src_rect = {info->x0, info->y0, info->x1 - info->x0, info->y1 - info->y0};
SDL_Rect dst_rect = {x + info->xoff, y + info->yoff, info->x1 - info->x0, info->y1 - info->y0};
SDL_RenderCopy(renderer, font->atlas, &src_rect, &dst_rect);
x += info->xadvance;
}
}
}
float STBTTF_MeasureText(STBTTF_Font* font, const char *text) {
float width = 0;
for(int i = 0; text[i]; i++) {
if (text[i] >= 32 && text[i] < 128) {
//if(i > 0) width += stbtt_GetCodepointKernAdvance(font->info, text[i - 1], text[i]) * font->scale;
stbtt_packedchar* info = &font->chars[text[i] - 32];
width += info->xadvance;
}
}
return width;
}
/*******************
* Example program *
*******************
#include <stdio.h>
#define STB_RECT_PACK_IMPLEMENTATION
#define STB_TRUETYPE_IMPLEMENTATION
#define STBTTF_IMPLEMENTATION
#include "stbttf.h"
int main(int argc, char** argv) {
if(argc != 2) {
fprintf(stderr, "usage: %s <font>\n", argv[0]);
exit(1);
}
SDL_Init(SDL_INIT_VIDEO);
SDL_Window* window = SDL_CreateWindow("stbttf", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
SDL_RenderSetLogicalSize(renderer, 640, 480);
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
STBTTF_Font* font = STBTTF_OpenFont(renderer, argv[1], 32);
while(1) {
SDL_Event event;
while(SDL_PollEvent(&event)) {
if(event.type == SDL_QUIT) exit(0);
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
SDL_RenderClear(renderer);
// set color and render some text
SDL_SetRenderDrawColor(renderer, 128, 0, 0, 255);
STBTTF_RenderText(renderer, font, 50, 50, "This is a test");
// render the atlas to check its content
//SDL_Rect dest = {0, 0, font->texturesize, font->texturesize};
//SDL_RenderCopy(renderer, font->atlas, &dest, &dest);
SDL_RenderPresent(renderer);
SDL_Delay(1000 / 60);
}
STBTTF_CloseFont(font);
SDL_Quit();
}
*/
#endif
#endif

105
ugui.c
View File

@ -12,6 +12,7 @@
#define DEF_SCALE 1.0
#define DEF_PPI 96.0
#define STACK_STEP 64
#define SLICE_STEP 128
#define RESIZEALL ( \
UG_CNT_RESIZE_RIGHT | \
@ -68,8 +69,6 @@ static const ug_style_t default_style = {
},
};
static const ug_vec2_t max_size = {{10e6}, {10e6}};
static ug_style_t style_cache = {0};
@ -171,7 +170,12 @@ static void update_style_cache(ug_ctx_t *ctx)
}
void push_rect_command(ug_ctx_t *ctx, const ug_rect_t *rect, ug_color_t color)
/*=============================================================================*
* Command Operations *
*=============================================================================*/
static 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);
@ -184,6 +188,21 @@ void push_rect_command(ug_ctx_t *ctx, const ug_rect_t *rect, ug_color_t color)
}
// pushes a text command to the render command stack, str is a pointer to a valid
// string offered by the user, it must be valid at least until rendering is done
static void push_text_command(ug_ctx_t *ctx, ug_vec2_t pos, int size, ug_color_t color, const char *str)
{
ug_cmd_t *c;
GET_FROM_STACK(ctx->cmd_stack, c);
c->type = UG_CMD_TEXT;
c->text.x = pos.x;
c->text.y = pos.y;
c->text.size = size;
c->text.color = color;
c->text.str = str;
}
/*=============================================================================*
* Context Operations *
*=============================================================================*/
@ -283,8 +302,8 @@ int ug_ctx_set_style(ug_ctx_t *ctx, const ug_style_t *style)
*=============================================================================*/
// get a new or existing container handle
static ug_container_t *get_container(ug_ctx_t *ctx, ug_id_t id)
// search a container by id int the stack and get it's address
static ug_container_t *search_container(ug_ctx_t *ctx, ug_id_t id)
{
ug_container_t *c = NULL;
for (int i = 0; i < ctx->cnt_stack.idx; i++) {
@ -293,6 +312,14 @@ static ug_container_t *get_container(ug_ctx_t *ctx, ug_id_t id)
break;
}
}
return c;
}
// 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 = search_container(ctx, id);
// if the container was not already there allocate a new one
if (!c) {
GET_FROM_STACK(ctx->cnt_stack, c);
@ -581,7 +608,7 @@ static int handle_container(ug_ctx_t *ctx, ug_container_t *cnt)
}
void draw_container(ug_ctx_t *ctx, ug_container_t *cnt)
static void draw_container(ug_ctx_t *ctx, ug_container_t *cnt, const char *text)
{
ug_rect_t draw_rect;
const ug_style_t *s = ctx->style_px;
@ -590,6 +617,7 @@ void draw_container(ug_ctx_t *ctx, ug_container_t *cnt)
int bt = s->cnt.border.t.size.i;
int bb = s->cnt.border.b.size.i;
int hh = s->cnt.titlebar.height.size.i;
int ts = s->text.size.size.i;
// push outline
draw_rect = cnt->rca;
@ -602,6 +630,13 @@ void draw_container(ug_ctx_t *ctx, ug_container_t *cnt)
draw_rect.w -= bl + br;
draw_rect.h = hh;
push_rect_command(ctx, &draw_rect, s->cnt.titlebar.bg_color);
if (text) {
// TODO: center the text horizontally
push_text_command(ctx,
(ug_vec2_t){.x = draw_rect.x + bl,
.y = draw_rect.y + bt + ts},
ts, s->text.color, text);
}
}
// push main body
@ -630,11 +665,12 @@ int ug_container_floating(ug_ctx_t *ctx, const char *name, ug_div_t div)
ug_id_t id = hash(name, strlen(name));
ug_container_t *cnt = get_container(ctx, id);
// maybe the name address was changed so always overwrite it
cnt->name = name;
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->rect = div_to_rect(ctx, &div);
cnt->flags = UG_CNT_FLOATING | RESIZEALL | UG_CNT_MOVABLE |
UG_CNT_SCROLL_X | UG_CNT_SCROLL_Y;
@ -658,11 +694,12 @@ int ug_container_popup(ug_ctx_t *ctx, const char *name, ug_div_t div)
ug_id_t id = hash(name, strlen(name));
ug_container_t *cnt = get_container(ctx, id);
// maybe the name address was changed so always overwrite it
cnt->name = name;
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->rect = div_to_rect(ctx, &div);
cnt->flags = UG_CNT_FLOATING;
}
@ -684,12 +721,12 @@ int ug_container_sidebar(ug_ctx_t *ctx, const char *name, ug_size_t size, int si
ug_id_t id = hash(name, strlen(name));
ug_container_t *cnt = get_container(ctx, id);
// maybe the name address was changed so always overwrite it
cnt->name = name;
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->flags = UG_CNT_SCROLL_X | UG_CNT_SCROLL_Y;
ug_rect_t rect = {0};
switch (side) {
@ -732,11 +769,12 @@ int ug_container_menu_bar(ug_ctx_t *ctx, const char *name, ug_size_t height)
ug_id_t id = hash(name, strlen(name));
ug_container_t *cnt = get_container(ctx, id);
// maybe the name address was changed so always overwrite it
cnt->name = name;
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->flags = 0;
ug_rect_t rect = {
.x = 0, .y = 0,
@ -761,11 +799,12 @@ int ug_container_body(ug_ctx_t *ctx, const char *name)
ug_id_t id = hash(name, strlen(name));
ug_container_t *cnt = get_container(ctx, id);
// maybe the name address was changed so always overwrite it
cnt->name = name;
if (cnt->id) {
// nothing? maybe we can skip updating all dimensions and stuff
} else {
cnt->id = id;
cnt->max_size = max_size;
cnt->flags = 0;
cnt->rect = (ug_rect_t){0};
}
@ -778,6 +817,21 @@ int ug_container_body(ug_ctx_t *ctx, const char *name)
}
// TODO: return an error indicating that no container exists with that name
int ug_container_remove(ug_ctx_t *ctx, const char *name)
{
TEST_CTX(ctx);
TEST_STR(name);
ug_id_t id = hash(name, strlen(name));
ug_container_t *c = search_container(ctx, id);
if (c) {
c->flags |= CNT_STATE_DELETE;
return 0;
} else return -1;
}
/*=============================================================================*
* Input Handling *
*=============================================================================*/
@ -827,9 +881,6 @@ 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;
@ -847,11 +898,19 @@ int ug_frame_begin(ug_ctx_t *ctx)
printf("Container Stack: active %x\n", ctx->active.cnt);
ug_vec2_t v = ctx->mouse.pos;
for (int i = 0; i < ctx->cnt_stack.idx; i++) {
printf("[%d]: %x\n", i, ctx->cnt_stack.items[i].id);
ug_rect_t r = ctx->cnt_stack.items[i].rca;
if (INTERSECTS(v, r)) {
ctx->hover.cnt = ctx->cnt_stack.items[i].id;
ug_container_t *c = &ctx->cnt_stack.items[i];
printf("[%d]: %x\n", i, c->id);
if (TEST(c->flags, CNT_STATE_DELETE)) {
DELETE_FROM_STACK(ctx->cnt_stack, c);
// FIXME: this should be fine since all elements in the
// stack are moved back and c now points to the
// container that would be next
}
ug_rect_t r = c->rca;
if (INTERSECTS(v, r))
ctx->hover.cnt = c->id;
}
printf("\n");
@ -877,9 +936,10 @@ int ug_frame_end(ug_ctx_t *ctx)
// before drawing floating contaners need to be drawn on top of the others
sort_containers(ctx);
for (int i = 0; i < ctx->cnt_stack.idx; i++)
draw_container(ctx, &ctx->cnt_stack.items[i]);
for (int i = 0; i < ctx->cnt_stack.idx; i++) {
ug_container_t *c = &ctx->cnt_stack.items[i];
draw_container(ctx, c, c->name);
}
ctx->input_text[0] = '\0';
ctx->key.update = 0;
@ -902,4 +962,3 @@ int ug_frame_end(ug_ctx_t *ctx)
return 0;
}

21
ugui.h
View File

@ -30,10 +30,10 @@ typedef enum {
// the z index of a container is determined by it's position on the stack
typedef struct {
ug_id_t id;
const char *name;
ug_rect_t rect;
// absolute position rect
ug_rect_t rca;
ug_vec2_t max_size;
unsigned int flags;
} ug_container_t;
@ -108,19 +108,21 @@ typedef struct {
// render commands
struct ug_cmd_rect { int x, y, w, h; ug_color_t color; };
struct ug_cmd_text { int x, y, size; ug_color_t color; const char *str; };
typedef struct {
unsigned int type;
union {
struct {
int x, y, w, h;
ug_color_t color;
} rect;
struct ug_cmd_rect rect;
struct ug_cmd_text text;
};
} ug_cmd_t;
typedef enum {
UG_CMD_NULL = 0,
UG_CMD_RECT,
UG_CMD_TEXT,
} ug_cmd_type_t;
// window side
@ -193,6 +195,8 @@ typedef struct {
// stacks
UG_STACK(ug_container_t) cnt_stack;
UG_STACK(ug_cmd_t) cmd_stack;
// command stack iterator
int cmd_it;
} ug_ctx_t;
@ -221,6 +225,9 @@ int ug_container_sidebar(ug_ctx_t *ctx, const char *name, ug_size_t size, int si
// a body is a container that scales with the window, sits at it's center and cannot
// be resized, it also fills all the available space
int ug_container_body(ug_ctx_t *ctx, const char *name);
// mark a conatiner for removal, it will be freed at the next frame beginning
int ug_container_remove(ug_ctx_t *ctx, const char *name);
// Input functions
int ug_input_mousemove(ug_ctx_t *ctx, int x, int y);
@ -233,6 +240,10 @@ int ug_input_scroll(ug_ctx_t *ctx, int x, int y);
int ug_frame_begin(ug_ctx_t *ctx);
int ug_frame_end(ug_ctx_t *ctx);
// Commands
// get the next command, save iteration state inside 'iterator'
ug_cmd_t *ug_cmd_next(ug_ctx_t *ctx);
#undef UG_STACK
#undef BIT