esp-who/components/fb_gfx/fb_gfx.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "stdint.h"
#include "stdarg.h"
#include "string.h"
#include "stdio.h"
#include "stdlib.h"
#include "fb_gfx.h"
typedef struct
{ // Data stored PER GLYPH
uint16_t bitmapOffset; // Pointer into GFXfont->bitmap
uint8_t width, height; // Bitmap dimensions in pixels
uint8_t xAdvance; // Distance to advance cursor (x axis)
int8_t xOffset, yOffset; // Dist from cursor pos to UL corner
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} GFXglyph;
typedef struct
{ // Data stored for FONT AS A WHOLE:
uint8_t *bitmap; // Glyph bitmaps, concatenated
GFXglyph *glyph; // Glyph array
uint8_t first, last; // ASCII extents
uint8_t yAdvance; // Newline distance (y axis)
uint8_t yOffset; // Y offset of the font zero line (y axis)
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} GFXfont;
#include "FreeMonoBold12pt7b.h" //14x24
#define gfxFont ((GFXfont *)(&FreeMonoBold12pt7b))
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void fb_gfx_fillRect(camera_fb_t *fb, int32_t x, int32_t y, int32_t w, int32_t h, uint32_t color)
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{
int bytes_per_pixel = 0;
switch (fb->format)
{
case PIXFORMAT_GRAYSCALE:
bytes_per_pixel = 1;
break;
case PIXFORMAT_RGB565:
bytes_per_pixel = 2;
break;
case PIXFORMAT_RGB888:
bytes_per_pixel = 3;
default:
break;
}
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int32_t line_step = (fb->width - w) * 3;
uint8_t *data = fb->buf + ((x + (y * fb->width)) * bytes_per_pixel);
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uint8_t c0 = color >> 16;
uint8_t c1 = color >> 8;
uint8_t c2 = color;
for (int i = 0; i < h; i++)
{
for (int j = 0; j < w; j++)
{
switch (bytes_per_pixel)
{
case 1:
data[0] = c2;
data++;
break;
case 2:
data[0] = c1;
data[1] = c2;
data += 2;
break;
case 3:
data[0] = c0;
data[1] = c1;
data[2] = c2;
data += 3;
default:
break;
}
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}
data += line_step;
}
}
void fb_gfx_drawFastHLine(camera_fb_t *fb, int32_t x, int32_t y, int32_t w, uint32_t color)
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{
fb_gfx_fillRect(fb, x, y, w, 1, color);
}
void fb_gfx_drawFastVLine(camera_fb_t *fb, int32_t x, int32_t y, int32_t h, uint32_t color)
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{
fb_gfx_fillRect(fb, x, y, 1, h, color);
}
uint8_t fb_gfx_putc(camera_fb_t *fb, int32_t x, int32_t y, uint32_t color, unsigned char c)
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{
uint16_t line_width;
uint8_t xa = 0, bit = 0, bits = 0, xx, yy;
uint8_t *bitmap;
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GFXglyph *glyph;
if ((c < 32) || (c < gfxFont->first) || (c > gfxFont->last))
{
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return xa;
}
c -= gfxFont->first;
glyph = &(gfxFont->glyph[c]);
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bitmap = gfxFont->bitmap + glyph->bitmapOffset;
xa = glyph->xAdvance;
x += glyph->xOffset;
y += glyph->yOffset;
y += gfxFont->yOffset;
line_width = 0;
for (yy = 0; yy < glyph->height; yy++)
{
for (xx = 0; xx < glyph->width; xx++)
{
if (bit == 0)
{
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bits = *bitmap++;
bit = 0x80;
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}
if (bits & bit)
{
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line_width++;
}
else if (line_width)
{
fb_gfx_drawFastHLine(fb, x + xx - line_width, y + yy, line_width, color);
line_width = 0;
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}
bit >>= 1;
}
if (line_width)
{
fb_gfx_drawFastHLine(fb, x + xx - line_width, y + yy, line_width, color);
line_width = 0;
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}
}
return xa;
}
uint32_t fb_gfx_print(camera_fb_t *fb, int32_t x, int32_t y, uint32_t color, const char *str)
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{
uint32_t l = 0;
int xc = x, yc = y, lc = fb->width - gfxFont->glyph[0].xAdvance;
uint8_t fh = gfxFont->yAdvance;
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char c = *str++;
while (c)
{
if (c != '\r')
{
if (c == '\n')
{
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yc += fh;
xc = x;
}
else
{
if (xc > lc)
{
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yc += fh;
xc = x;
}
xc += fb_gfx_putc(fb, xc, yc, color, c);
}
}
l++;
c = *str++;
}
return l;
}
uint32_t fb_gfx_printf(camera_fb_t *fb, int32_t x, int32_t y, uint32_t color, const char *format, ...)
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{
char loc_buf[64];
char *temp = loc_buf;
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int len;
va_list arg;
va_list copy;
va_start(arg, format);
va_copy(copy, arg);
len = vsnprintf(loc_buf, sizeof(loc_buf), format, arg);
va_end(copy);
if (len >= sizeof(loc_buf))
{
temp = (char *)malloc(len + 1);
if (temp == NULL)
{
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return 0;
}
}
vsnprintf(temp, len + 1, format, arg);
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va_end(arg);
fb_gfx_print(fb, x, y, color, temp);
if (len > 64)
{
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free(temp);
}
return len;
}