Move the image loader to shared

MODULE.bazel

@@ -19,6 +19,6 @@ pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
 pip.parse(
     hub_name = "pytools_deps",
     python_version = "3.10",
-    requirements_lock = "//pytools:requirements.txt",
+    requirements_lock = "//pytools:requirements.lock",
 )
 use_repo(pip, "pytools_deps")

MODULE.bazel.lock

@@ -1,6 +1,6 @@
 {
   "lockFileVersion": 3,
-  "moduleFileHash": "f69bdb13b0df2f6d309d415437228ebef31fa559567a65ecfe60de77e328ae1d",
+  "moduleFileHash": "b7a605dff62d0b97615cf1feb669dc4d3ce630abf1e74374f624b71287684b40",
   "flags": {
     "cmdRegistries": [
       "https://bcr.bazel.build/"
@@ -72,7 +72,7 @@
               "attributeValues": {
                 "hub_name": "pytools_deps",
                 "python_version": "3.10",
-                "requirements_lock": "//pytools:requirements.txt"
+                "requirements_lock": "//pytools:requirements.lock"
               },
               "devDependency": false,
               "location": {
@@ -1741,10 +1741,60 @@
       "os:windows,arch:amd64": {
         "bzlTransitiveDigest": "EY+DGyyJhrqMHBCiplU6kCYiNtiUXl3Olt6+vF4JnfE=",
         "accumulatedFileDigests": {
-          "@@//pytools:requirements.txt": "ecb2c096486b1bb4dbe407a48fb3375ba496b6ea658c0cd7fc34571f381cd504"
+          "@@//pytools:requirements.lock": "5a2eed9c6e50e9034521853f6016123e3e526900ddf3ff81cc1dbaaa28683629"
         },
         "envVariables": {},
         "generatedRepoSpecs": {
+          "pytools_deps_310_jinja2": {
+            "bzlFile": "@@rules_python~0.31.0//python/pip_install:pip_repository.bzl",
+            "ruleClassName": "whl_library",
+            "attributes": {
+              "name": "rules_python~0.31.0~pip~pytools_deps_310_jinja2",
+              "requirement": "Jinja2==3.1.3",
+              "repo": "pytools_deps_310",
+              "repo_prefix": "pytools_deps_310_",
+              "whl_patches": {},
+              "experimental_target_platforms": [],
+              "python_interpreter": "",
+              "python_interpreter_target": "@@rules_python~0.31.0~python~python_3_10_host//:python",
+              "quiet": true,
+              "timeout": 600,
+              "isolated": true,
+              "extra_pip_args": [],
+              "download_only": false,
+              "pip_data_exclude": [],
+              "enable_implicit_namespace_pkgs": false,
+              "environment": {},
+              "envsubst": [],
+              "group_name": "",
+              "group_deps": []
+            }
+          },
+          "pytools_deps_310_markupsafe": {
+            "bzlFile": "@@rules_python~0.31.0//python/pip_install:pip_repository.bzl",
+            "ruleClassName": "whl_library",
+            "attributes": {
+              "name": "rules_python~0.31.0~pip~pytools_deps_310_markupsafe",
+              "requirement": "MarkupSafe==2.1.5",
+              "repo": "pytools_deps_310",
+              "repo_prefix": "pytools_deps_310_",
+              "whl_patches": {},
+              "experimental_target_platforms": [],
+              "python_interpreter": "",
+              "python_interpreter_target": "@@rules_python~0.31.0~python~python_3_10_host//:python",
+              "quiet": true,
+              "timeout": 600,
+              "isolated": true,
+              "extra_pip_args": [],
+              "download_only": false,
+              "pip_data_exclude": [],
+              "enable_implicit_namespace_pkgs": false,
+              "environment": {},
+              "envsubst": [],
+              "group_name": "",
+              "group_deps": []
+            }
+          },
           "pytools_deps_310_pillow": {
             "bzlFile": "@@rules_python~0.31.0//python/pip_install:pip_repository.bzl",
             "ruleClassName": "whl_library",
@@ -1786,6 +1836,12 @@
               "name": "rules_python~0.31.0~pip~pytools_deps",
               "repo_name": "pytools_deps",
               "whl_map": {
+                "jinja2": [
+                  "3.10"
+                ],
+                "markupsafe": [
+                  "3.10"
+                ],
                 "pillow": [
                   "3.10"
                 ]

README.md

@@ -15,3 +15,11 @@ $ bazel run -c opt sdl_host.exe
 ```
 $ bazel run sdl_host.exe
 ```
+
+## Dump requirements
+
+(TODO: Automate)
+
+```
+$ pip freeze -r requirements.txt > requirements.lock
+```

pytools/BUILD

@@ -2,9 +2,10 @@ load("@pytools_deps//:requirements.bzl", "requirement")
 
 py_binary(
     name = "font",
-    srcs = ["font.py"],
+    srcs = ["font.py", "shared.py"],
     deps = [
         requirement("pillow"),
+        requirement("Jinja2"),
     ],
     visibility = ["//visibility:public"],
 )

pytools/font.py

@@ -1,6 +1,13 @@
 from typing import Tuple
 from PIL import Image
 import sys
+import shared
+
+TEMPLATE = """
+// generated code! be nice!
+#include "sys/sys.h"
+sys_glyph {{ font_name }}[{{ n_glyphs }}] = { {{- glyphs|join(", ") -}} };
+""".lstrip()
 
 
 def main(font_name, n_glyphs, fname_png, fname_c):
@@ -8,37 +15,32 @@ def main(font_name, n_glyphs, fname_png, fname_c):
     assert(len(glyphs) == n_glyphs), f"must be exactly {n_glyphs} glyphs"
 
     with open(fname_c, "wt") as output:
-        output.writelines([
-            "// generated code! be nice!\n",
-            "#include \"sys/sys.h\"\n",
-            f"sys_glyph {font_name}[{n_glyphs}] = {{{', '.join(str(g) for g in glyphs)}}};\n"
-        ])
+        output.write(
+            shared.templates.from_string(TEMPLATE).render(
+                font_name=font_name,
+                n_glyphs=n_glyphs,
+                glyphs=glyphs,
+            )
+        )
 
 
 def load_glyphs(fname_png: str):
-    with Image.open(fname_png) as im:
-        width = im.width
-        height = im.height
+    width, height, data = shared.load_image(fname_png)
+    monochrome = [pixel_to_monochrome(p) for p in data]
 
-        assert width % 8 == 0, "width must be a multiple of 8"
-        assert height % 8 == 0, "height must be a multiple of 8"
+    glyphs = []
+    for gy in range(0, height, 8):
+        for gx in range(0, width, 8):
+            glyph = 0
+            for py in range(0, 8):
+                for px in range(0, 8):
+                    x = gx + px
+                    y = gy + py
+                    if monochrome[y * width + x]:
+                        glyph |= 1 << (py * 8 + px)
+            glyphs.append(glyph)
 
-        data = list(im.convert("RGBA").getdata())
-        monochrome = [pixel_to_monochrome(p) for p in data]
-
-        glyphs = []
-        for gy in range(0, height, 8):
-            for gx in range(0, width, 8):
-                glyph = 0
-                for py in range(0, 8):
-                    for px in range(0, 8):
-                        x = gx + px
-                        y = gy + py
-                        if monochrome[y * width + x]:
-                            glyph |= 1 << (py * 8 + px)
-                glyphs.append(glyph)
-
-        return glyphs
+    return glyphs
 
 
 def pixel_to_monochrome(rgba: Tuple[int, int, int, int]):

pytools/requirements.lock

@@ -0,0 +1,4 @@
+pillow==10.2.0
+Jinja2==3.1.3
+## The following requirements were added by pip freeze:
+MarkupSafe==2.1.5

pytools/requirements.txt

@@ -1 +1,2 @@
 pillow==10.2.0
+Jinja2==3.1.3

pytools/shared.py

@@ -0,0 +1,17 @@
+from PIL import Image
+from jinja2 import Environment, BaseLoader, select_autoescape
+
+templates = Environment(
+    loader=BaseLoader(),
+    autoescape=select_autoescape(),
+)
+
+def load_image(fname):
+    with Image.open(fname) as im:
+        width = im.width
+        height = im.height
+
+        assert width % 8 == 0, "width must be a multiple of 8"
+        assert height % 8 == 0, "height must be a multiple of 8"
+
+        return width, height, list(im.convert("RGBA").getdata())

sys/sys_data.h

@@ -3,10 +3,18 @@
 
 #include <stdint.h>
 
+#define SYS_COLOR_TRANSPARENT 255
+#define SYS_COLOR_N 256
+#define SYS_SPRITE_H 8
+#define SYS_SPRITE_W 8
+
 typedef int32_t sys_i32;
 typedef uint8_t sys_color;
 typedef uint32_t sys_screen_color;
 typedef uint64_t sys_glyph;
+typedef struct { 
+    sys_color pixels[SYS_SPRITE_H][SYS_SPRITE_W];
+} sys_sprite;
 
 sys_screen_color sys_make_screen_color(uint8_t r, uint8_t g, uint8_t b);
 
@@ -15,7 +23,4 @@ sys_i32 sys_min_i32(sys_i32 x, sys_i32 y);
 sys_i32 sys_abs_i32(sys_i32 x); 
 sys_i32 sys_sgn_i32(sys_i32 x); 
 
-#define SYS_COLOR_TRANSPARENT 255
-#define SYS_COLOR_N 256
-
 #endif  // CROCPARTY_SYS_DATA_H