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draws bitmaps better

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This commit is contained in:
Drath Vader
2026-08-07 23:15:32 +02:00
parent 16b7355361
commit 73111be65d
2 changed files with 25 additions and 20 deletions
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19
bmp2h.py
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@@ -13,26 +13,25 @@ def get_bytestring(fname):
const uint8_t """ + bmp_name + """_data[] PROGMEM = {""", end="")
with Image.open(fname) as im:
w = im.size[0]
h = im.size[1]
w, h = im.size
im = im.convert('L')
pix = im.load()
for i in range(w*h // 8):
x = (i * 8) % w
y = i // (w // 8)
b = 0
if x == 0:
row_bytes = (w + 7) // 8
for y in range(h):
print("")
for bx in range(row_bytes):
x = bx * 8
b = 0
for bit in range(8):
if x + bit >= w: break
if y >= h: break
if x + bit >= w:
break
if pix[x + bit, y] < 127:
b += 1 << bit
print("\t", hex(b), end=", ")
print("""
};

16
esp-gfx/gfx.c
View File

@@ -93,11 +93,17 @@ void gfx_fill_box(const gfx_canvas_t *canvas, const uint8_t pos_x, const uint8_t
void gfx_draw_bitmap(const gfx_canvas_t *canvas, const uint8_t pos_x, const uint8_t pos_y, const gfx_bitmap_t bmp, const bool inverted) {
void (*draw_cb)(void* ctx, uint8_t x, uint8_t y) = inverted ? canvas->clear_pixel_callback : canvas->draw_pixel_callback;
for (uint16_t i = 0; i < (uint16_t)(bmp.height * bmp.width / 8); i++) {
const uint8_t x = (i * 8) % bmp.width;
const uint8_t y = i / (bmp.width / 8);
for (uint8_t j = 0; j < 8; j++)
if (bmp.data[i] & (1 << j))
const uint8_t row_bytes = (bmp.width + 7) / 8;
for (uint8_t y = 0; y < bmp.height; y++) {
for (uint8_t bx = 0; bx < row_bytes; bx++) {
const uint8_t byte = bmp.data[y * row_bytes + bx];
const uint8_t x = bx * 8;
for (uint8_t j = 0; j < 8; j++) {
if (x + j >= bmp.width) break;
if (byte & (1 << j))
draw_cb(canvas->ctx, pos_x + x + j, pos_y + y);
}
}
}
}