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[89.104.8.17]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a7246114f68sm189138666b.91.2024.06.24.03.10.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Jun 2024 03:10:48 -0700 (PDT) From: Phil Dennis-Jordan To: qemu-devel@nongnu.org Cc: marcandre.lureau@redhat.com, akihiko.odaki@daynix.com, lists@philjordan.eu, Phil Dennis-Jordan Subject: [PATCH v2] Cursor: 8 -> 1 bit alpha downsampling improvement Date: Mon, 24 Jun 2024 12:10:40 +0200 Message-Id: <20240624101040.82726-1-phil@philjordan.eu> X-Mailer: git-send-email 2.39.3 (Apple Git-146) MIME-Version: 1.0 Received-SPF: neutral client-ip=2a00:1450:4864:20::633; envelope-from=phil@philjordan.eu; helo=mail-ej1-x633.google.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NEUTRAL=0.779 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Mouse cursors with 8 bit alpha were downsampled to 1-bit opacity maps by turning alpha values of 255 into 1 and everything else into 0. This means that mostly-opaque pixels ended up completely invisible. This patch changes the behaviour so that only pixels with less than 50% alpha (0-127) are treated as transparent when converted to 1-bit alpha. This greatly improves the subjective appearance of anti-aliased mouse cursors, such as those used by macOS, when using a front-end UI without support for alpha-blended cursors, such as some VNC clients. Signed-off-by: Phil Dennis-Jordan Reviewed-by: Akihiko Odaki Reviewed-by: Marc-André Lureau --- ui/cursor.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/ui/cursor.c b/ui/cursor.c index 29717b3ecb..dd3853320d 100644 --- a/ui/cursor.c +++ b/ui/cursor.c @@ -232,7 +232,7 @@ void cursor_get_mono_mask(QEMUCursor *c, int transparent, uint8_t *mask) for (y = 0; y < c->height; y++) { bit = 0x80; for (x = 0; x < c->width; x++, data++) { - if ((*data & 0xff000000) != 0xff000000) { + if ((*data & 0x80000000) == 0x0) { /* Alpha < 0x80 (128) */ if (transparent != 0) { mask[x/8] |= bit; }