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bitmap drawing: Negate alpha channel to match alpha information format of font files.

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The comment about the format was actually incorrect. The alpha information
is now negated during conversion to native format, according to the
corrected comment.

Change-Id: Ifdb9ffdf9b55e39e64983eec2d9d60339e570bd9
This commit is contained in:
Thomas Martitz 2013-02-12 10:26:44 +01:00
parent c66a66728c
commit ca634a0ac0
2 changed files with 11 additions and 10 deletions
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5
apps/recorder/bmp.c
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@ -470,8 +470,9 @@ void output_row_8_native(uint32_t row, void * row_in,
*dest = LCD_RGBPACK_LCD(r, g, b);
dest += STRIDE_MAIN(1, ctx->bm->height);
if (bm_alpha) {
/* pack alpha channel for 2 pixels into 1 byte */
unsigned alpha = qp->alpha;
/* pack alpha channel for 2 pixels into 1 byte and negate
* according to the interal alpha channel format */
uint8_t alpha = ~qp->alpha;
if (col%2)
*bm_alpha++ |= alpha&0xf0;
else