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authorThomas Martitz <kugel@rockbox.org>2013-02-12 10:26:44 +0100
committerThomas Martitz <kugel@rockbox.org>2013-02-12 10:29:25 +0100
commitca634a0ac0877c60417182d6415f159fefd6ad9d (patch)
tree99525e3648b2766d18990f3bf9b45d1d695cd4a9 /apps/recorder
parentc66a66728c855456a465a57504344038b3224dd9 (diff)
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bitmap drawing: Negate alpha channel to match alpha information format of font files.
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
Diffstat (limited to 'apps/recorder')
-rw-r--r--apps/recorder/bmp.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/apps/recorder/bmp.c b/apps/recorder/bmp.c
index 43afcc5e98..011a4d60fe 100644
--- a/apps/recorder/bmp.c
+++ b/apps/recorder/bmp.c
@@ -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