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Merge pull request #255 from jquatier/bitmap-scaling-7789

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fixing scaling of bitmaps for 7789 display
This commit is contained in:
ripplebiz
2025-05-08 11:33:49 +10:00
committed by GitHub
parent 90b3b1b6fe 94db70d511
commit eba0daf70a
1 changed files with 33 additions and 1 deletions
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34
src/helpers/ui/ST7789Display.cpp
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@@ -111,7 +111,39 @@ 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++) {
// Calculate the target y-coordinates for this logical row
int y1 = startY + (int)(by * SCALE_Y);
int y2 = startY + (int)((by + 1) * SCALE_Y);
int block_h = y2 - y1;
// Scan across the row bit by bit
for (uint16_t bx = 0; bx < w; bx++) {
// Calculate the target x-coordinates for this logical column
int x1 = startX + (int)(bx * SCALE_X);
int x2 = startX + (int)((bx + 1) * SCALE_X);
int block_w = x2 - x1;
// 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 a block of pixels
if (bitSet) {
// Draw the block as a filled rectangle
display.fillRect(x1, y1, block_w, block_h);
}
}
}
}
uint16_t ST7789Display::getTextWidth(const char* str) {