return 0;
}
+static void scaleup(uint8_t *dst, const uint8_t *src, int w)
+{
+ int x;
+ for (x = 0; x < w - 7; x+=8) {
+ dst[x + 0] =
+ dst[x + 1] = src[(x>>1) + 0];
+ dst[x + 2] =
+ dst[x + 3] = src[(x>>1) + 1];
+ dst[x + 4] =
+ dst[x + 5] = src[(x>>1) + 2];
+ dst[x + 6] =
+ dst[x + 7] = src[(x>>1) + 3];
+ }
+ for (; x < w; x++) {
+ dst[x] = src[(x>>1)];
+ }
+}
+
+static void scaleup_rev(uint8_t *dst, const uint8_t *src, int w)
+{
+ int x;
+
+ for (x = w - 1; (x+1) & 7; x--) {
+ dst[x] = src[(x>>1)];
+ }
+ for (x -= 7; x >= 0; x -= 8) {
+ dst[x + 6] =
+ dst[x + 7] = src[(x>>1) + 3];
+ dst[x + 4] =
+ dst[x + 5] = src[(x>>1) + 2];
+ dst[x + 2] =
+ dst[x + 3] = src[(x>>1) + 1];
+ dst[x + 0] =
+ dst[x + 1] = src[(x>>1) + 0];
+ }
+}
+
+static void scaledown(uint8_t *dst, const uint8_t *src, int w)
+{
+ int x;
+ for (x = 0; x < w - 7; x+=8) {
+ dst[x + 0] = src[2*x + 0];
+ dst[x + 1] = src[2*x + 2];
+ dst[x + 2] = src[2*x + 4];
+ dst[x + 3] = src[2*x + 6];
+ dst[x + 4] = src[2*x + 8];
+ dst[x + 5] = src[2*x +10];
+ dst[x + 6] = src[2*x +12];
+ dst[x + 7] = src[2*x +14];
+ }
+ for (; x < w; x++) {
+ dst[x] = src[2*x];
+ }
+}
+
static void rescale(GDVContext *gdv, uint8_t *dst, int w, int h, int scale_v, int scale_h)
{
- int j, y, x;
+ int j, y;
if ((gdv->scale_v == scale_v) && (gdv->scale_h == scale_h)) {
return;
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
uint8_t *src1 = dst + PREAMBLE_SIZE + (y>>!!gdv->scale_h) * (w>>1);
- for (x = w - 1; x >= 0 && !(x&1); x--) {
- dst1[x] = src1[(x>>1)];
- }
-
- for (x--; x >= 0; x-=2) {
- dst1[x ] =
- dst1[x+1] = src1[(x>>1)];
- }
+ scaleup_rev(dst1, src1, w);
}
} else if (gdv->scale_h) {
for (j = 0; j < h; j++) {
for (y = 0; y < (h>>1); y++) {
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * (w>>1);
uint8_t *src1 = dst + PREAMBLE_SIZE + y*2 * w;
- for (x = 0; x < (w>>1); x++) {
- dst1[x] = src1[x*2];
- }
+ scaledown(dst1, src1, w>>1);
}
} else if (scale_h) {
for (y = 0; y < (h>>1); y++) {
} else if (scale_v) {
for (y = 0; y < h; y++) {
uint8_t *dst1 = dst + PREAMBLE_SIZE + y * w;
- for (x = 0; x < (w>>1); x++) {
- dst1[x] = dst1[x*2];
- }
+ scaledown(dst1, dst1, w>>1);
}
}
}
} else {
int sidx = PREAMBLE_SIZE, didx = 0;
- int y, x;
+ int y;
for (y = 0; y < avctx->height; y++) {
if (!gdv->scale_v) {
memcpy(dst + didx, gdv->frame + sidx, avctx->width);
} else {
- for (x = 0; x < avctx->width - 1; x+=2) {
- dst[didx + x ] =
- dst[didx + x + 1] = gdv->frame[sidx + (x>>1)];
- }
- for (; x < avctx->width; x++) {
- dst[didx + x] = gdv->frame[sidx + (x>>1)];
- }
+ uint8_t *dst2 = dst + didx;
+ uint8_t *src2 = gdv->frame + sidx;
+
+ scaleup(dst2, src2, avctx->width);
}
if (!gdv->scale_h || ((y & 1) == 1)) {
sidx += !gdv->scale_v ? avctx->width : avctx->width/2;