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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=duncanthrax.net; s=dkim; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=r33xP1EqWzmTK5vB9LAYQTixB/E5gfdUEM5rWfgDt0c=; b=CHmG3PybYFhzsBDPGzOOr7vRQn jOVyW+SbFJNJJ9U9qKqUIRMUYK8UaBPXpQ9wvPKiBRaEIwRV9d0ZENtePKYE5naN7rdcuxHZKT6BY zte6DLaWdiGMPGaVGqqrTzWXXXuBEzjcwps/YaFqQPUUedd2XywuVkMi36OThlfuxays=; Received: from [134.3.47.90] (helo=t470p.stackframe.org) by smtp.duncanthrax.net with esmtpa (Exim 4.90_1) (envelope-from ) id 1j2tUw-0003qb-PW; Sat, 15 Feb 2020 10:12:26 +0100 Date: Sat, 15 Feb 2020 10:12:26 +0100 From: Sven Schnelle To: Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= Subject: Re: [PATCH 2/5] hw/display/artist: Remove pointless initialization Message-ID: <20200215091226.GC18657@t470p.stackframe.org> References: <20200214001303.12873-1-f4bug@amsat.org> <20200214001303.12873-3-f4bug@amsat.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20200214001303.12873-3-f4bug@amsat.org> User-Agent: Mutt/1.12.2 (2019-09-21) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 91.207.61.48 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Helge Deller , Gerd Hoffmann , qemu-devel@nongnu.org, Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Fri, Feb 14, 2020 at 01:12:59AM +0100, Philippe Mathieu-Daudé wrote: > We are initializating incy inconditionally: > > if (y1 <= y2) { > incy = 1; > } else { > incy = -1; > } > > Signed-off-by: Philippe Mathieu-Daudé > --- > hw/display/artist.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/hw/display/artist.c b/hw/display/artist.c > index abacb0e27d..47f0e9f0bc 100644 > --- a/hw/display/artist.c > +++ b/hw/display/artist.c > @@ -557,91 +557,90 @@ static void fill_window(ARTISTState *s, int startx, int starty, > static void draw_line(ARTISTState *s, int x1, int y1, int x2, int y2, > bool update_start, int skip_pix, int max_pix) > { > struct vram_buffer *buf; > uint8_t color = artist_get_color(s); > int dx, dy, t, e, x, y, incy, diago, horiz; > bool c1; > uint8_t *p; > > trace_artist_draw_line(x1, y1, x2, y2); > > if (update_start) { > s->vram_start = (x2 << 16) | y2; > } > > buf = &s->vram_buffer[ARTIST_BUFFER_AP]; > > c1 = false; > - incy = 1; > > if (x2 > x1) { > dx = x2 - x1; > } else { > dx = x1 - x2; > } > if (y2 > y1) { > dy = y2 - y1; > } else { > dy = y1 - y2; > } > if (dy > dx) { > t = y2; > y2 = x2; > x2 = t; > > t = y1; > y1 = x1; > x1 = t; > > t = dx; > dx = dy; > dy = t; > > c1 = true; > } > > if (x1 > x2) { > t = y2; > y2 = y1; > y1 = t; > > t = x1; > x1 = x2; > x2 = t; > } > > horiz = dy << 1; > diago = (dy - dx) << 1; > e = (dy << 1) - dx; > > if (y1 <= y2) { > incy = 1; > } else { > incy = -1; > } > x = x1; > y = y1; > > do { > if (c1) { > p = buf->data + x * s->width + y; > } else { > p = buf->data + y * s->width + x; > } > > if (skip_pix > 0) { > skip_pix--; > } else { > artist_rop8(s, p, color); > } > > if (e > 0) { > artist_invalidate_lines(buf, y, 1); > y += incy; > e += diago; > } else { > e += horiz; > } > x++; > } while (x <= x2 && (max_pix == -1 || --max_pix > 0)); > } > -- > 2.21.1 > Acked-by: Sven Schnelle