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sm501: Optimize small overlapping blits

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AmigaOS tends to do a lot of small blits (even 1 pixel). Avoid malloc
overhead by keeping around a buffer for this and only alloc when
blitting larger areas.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-id: 7946852258d528497e85f465327fc90b5c3b59fb.1590089984.git.balaton@eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2020-05-21 21:39:44 +02:00 committed by Gerd Hoffmann
parent b15a22bbcb
commit fa70c2871f
1 changed files with 11 additions and 4 deletions
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15
hw/display/sm501.c
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@ -750,6 +750,7 @@ static void sm501_2d_operation(SM501State *s)
switch (cmd) {
case 0: /* BitBlt */
{
static uint32_t tmp_buf[16384];
unsigned int src_x = (s->twoD_source >> 16) & 0x01FFF;
unsigned int src_y = s->twoD_source & 0xFFFF;
uint32_t src_base = s->twoD_source_base & 0x03FFFFFF;
@ -812,10 +813,14 @@ static void sm501_2d_operation(SM501State *s)
de = db + width + height * (width + dst_pitch);
if (rtl && ((db >= sb && db <= se) || (de >= sb && de <= se))) {
/* regions may overlap: copy via temporary */
int llb = width * (1 << format);
int free_buf = 0, llb = width * (1 << format);
int tmp_stride = DIV_ROUND_UP(llb, sizeof(uint32_t));
uint32_t *tmp = g_malloc(tmp_stride * sizeof(uint32_t) *
height);
uint32_t *tmp = tmp_buf;
if (tmp_stride * sizeof(uint32_t) * height > sizeof(tmp_buf)) {
tmp = g_malloc(tmp_stride * sizeof(uint32_t) * height);
free_buf = 1;
}
pixman_blt((uint32_t *)&s->local_mem[src_base], tmp,
src_pitch * (1 << format) / sizeof(uint32_t),
tmp_stride, 8 * (1 << format), 8 * (1 << format),
@ -825,7 +830,9 @@ static void sm501_2d_operation(SM501State *s)
dst_pitch * (1 << format) / sizeof(uint32_t),
8 * (1 << format), 8 * (1 << format),
0, 0, dst_x, dst_y, width, height);
g_free(tmp);
if (free_buf) {
g_free(tmp);
}
} else {
pixman_blt((uint32_t *)&s->local_mem[src_base],
(uint32_t *)&s->local_mem[dst_base],