Added esp-idf font and sprite example

Author: bitbank2

examples/esp_idf/font_demo/CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.16)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(font_demo)

examples/esp_idf/font_demo/README.txt

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+//
+// This demo shows how to use both virtual display surfaces and
+// custom fonts. The fonts are created with the fontconvert tool (in this repo)
+// and a TTF (TrueType font) file as the source.
+// Use fontconvert to create the sizes and character ranges of fonts needed
+// for your projects. Characters 32 to 127 are the standard ASCII set and
+// 128 to 255 are the extended ASCII set which follows Microsoft's codepage 1252
+// CP1252 consists of most symbols and accented characters from European
+// Latin languages
+// The strings passed to FastEPD are in ASCII or UTF-8 format
+//
+// The fontconvert tool example:
+// ./fontconvert <source.ttf> <output.h> size start end
+// For example, to create the 80pt Roboto-Black font used in this example, the
+// command line arguments would be:
+// ./fontconvert Roboto-Black.ttf Roboto_Black_80.h 80 32 255
+// This creates the full ASCII and extended ASCII set of characters
+//
+

examples/esp_idf/font_demo/main/CMakeLists.txt

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+idf_component_register(SRCS "font_demo.c"
+                    INCLUDE_DIRS ".")

examples/esp_idf/font_demo/main/font_demo.c

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+//
+// Anti-aliased font demo
+//
+#include <stdio.h>
+#include "esp_sleep.h"
+#include "driver/gpio.h"
+#include "driver/rtc_io.h"
+#include "driver/i2c.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+
+#include "../../../../src/FastEPD.h"
+#include "../../../../Fonts/Roboto_Black_80.h"
+#include "../../../../Fonts/Roboto_Black_40.h"
+
+FASTEPDSTATE bbep, virt;
+ 
+void app_main(void)
+{
+int rc;
+
+// We have enough PSRAM to allocate full sized buffers
+// for a full screen virtual device and the physical
+// device (M5Stack PaperS3 in this case - 960x540)
+// We'll draw on the virtual memory device, then copy
+// it to the framebuffer of the physical device and
+// do a 16-gray update
+
+    bbepInitPanel(&virt, BB_PANEL_VIRTUAL, 0);
+    // A virtual panel must be given a size
+    bbepSetPanelSize(&virt, 960, 540, 0);
+
+    // Predefined devices can have a display size
+    // associated with them already
+    rc = bbepInitPanel(&bbep, BB_PANEL_M5PAPERS3, 20000000);
+    if (rc == BBEP_SUCCESS) {
+      bbepSetMode(&virt, BB_MODE_4BPP); // source and destination
+      bbepSetMode(&bbep, BB_MODE_4BPP); // need to be the same bit depth
+      bbepFillScreen(&virt, 0xf); // fill with white
+
+      // The y coordinate represents the character baseline
+      // not the upper left corner
+      bbepWriteStringCustom(&virt, Roboto_Black_40, 0, 200, "Normal, 1-bit font", BBEP_BLACK);
+      virt.anti_alias = 1; // turn on antialiased mode
+      // Use a font with a point size 2x bigger to get the same
+      // size output in anti-alias mode. (80 vs 40pt)
+      bbepWriteStringCustom(&virt, Roboto_Black_80, 0, 400, "Antialiased, 2-bit font", BBEP_BLACK);
+
+      // Draw the virtual device framebuffer onto the 
+      // physical device framebuffer at (0,0)
+      bbepDrawSprite(&virt, &bbep, 0, 0, -1);
+
+      // Draw the physical device framebuffer onto the Eink panel
+      bbepFullUpdate(&bbep, CLEAR_SLOW, 0, NULL);
+    }
+}