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fixing scaling of bitmaps for 7789 display

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JQ
2025-05-06 20:47:14 -07:00
parent f855523481
commit 941d2d5c13
1 changed files with 29 additions and 1 deletions
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30
src/helpers/ui/ST7789Display.cpp
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@@ -111,7 +111,35 @@ void ST7789Display::drawRect(int x, int y, int w, int h) {
}
void ST7789Display::drawXbm(int x, int y, const uint8_t* bits, int w, int h) {
display.drawBitmap(x*SCALE_X + X_OFFSET, y*SCALE_Y + Y_OFFSET, w, h, bits);
// Calculate the base position in display coordinates
uint16_t startX = x * SCALE_X + X_OFFSET;
uint16_t startY = y * SCALE_Y + Y_OFFSET;
// Width in bytes for bitmap processing
uint16_t widthInBytes = (w + 7) / 8;
// Process the bitmap row by row
for (uint16_t by = 0; by < h; by++) {
// Scan across the row bit by bit
for (uint16_t bx = 0; bx < w; bx++) {
// Get the current bit
uint16_t byteOffset = (by * widthInBytes) + (bx / 8);
uint8_t bitMask = 0x80 >> (bx & 7);
bool bitSet = pgm_read_byte(bits + byteOffset) & bitMask;
// If the bit is set, draw pixels using setPixel with scaling
if (bitSet) {
// Apply scaling - draw multiple pixels for each original bitmap pixel
for (uint16_t scaleY = 0; scaleY <= (uint16_t)SCALE_Y; scaleY++) {
for (uint16_t scaleX = 0; scaleX <= (uint16_t)SCALE_X; scaleX++) {
uint16_t pixelX = startX + (uint16_t)(bx * SCALE_X) + scaleX;
uint16_t pixelY = startY + (uint16_t)(by * SCALE_Y) + scaleY;
display.setPixel(pixelX, pixelY);
}
}
}
}
}
}
uint16_t ST7789Display::getTextWidth(const char* str) {