summaryrefslogtreecommitdiffstats
path: root/gfx/ycbcr/ycbcr_to_rgb565.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'gfx/ycbcr/ycbcr_to_rgb565.cpp')
-rw-r--r--gfx/ycbcr/ycbcr_to_rgb565.cpp672
1 files changed, 672 insertions, 0 deletions
diff --git a/gfx/ycbcr/ycbcr_to_rgb565.cpp b/gfx/ycbcr/ycbcr_to_rgb565.cpp
new file mode 100644
index 0000000000..fe28245a9c
--- /dev/null
+++ b/gfx/ycbcr/ycbcr_to_rgb565.cpp
@@ -0,0 +1,672 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <stdlib.h>
+#include <limits.h>
+#include "nsDebug.h"
+#include "ycbcr_to_rgb565.h"
+#include "nsAlgorithm.h"
+
+
+
+#ifdef HAVE_YCBCR_TO_RGB565
+
+namespace mozilla {
+
+namespace gfx {
+
+/*This contains all of the parameters that are needed to convert a row.
+ Passing them in a struct instead of as individual parameters saves the need
+ to continually push onto the stack the ones that are fixed for every row.*/
+struct yuv2rgb565_row_scale_bilinear_ctx{
+ uint16_t *rgb_row;
+ const uint8_t *y_row;
+ const uint8_t *u_row;
+ const uint8_t *v_row;
+ int y_yweight;
+ int y_pitch;
+ int width;
+ int source_x0_q16;
+ int source_dx_q16;
+ /*Not used for 4:4:4, except with chroma-nearest.*/
+ int source_uv_xoffs_q16;
+ /*Not used for 4:4:4 or chroma-nearest.*/
+ int uv_pitch;
+ /*Not used for 4:2:2, 4:4:4, or chroma-nearest.*/
+ int uv_yweight;
+};
+
+
+
+/*This contains all of the parameters that are needed to convert a row.
+ Passing them in a struct instead of as individual parameters saves the need
+ to continually push onto the stack the ones that are fixed for every row.*/
+struct yuv2rgb565_row_scale_nearest_ctx{
+ uint16_t *rgb_row;
+ const uint8_t *y_row;
+ const uint8_t *u_row;
+ const uint8_t *v_row;
+ int width;
+ int source_x0_q16;
+ int source_dx_q16;
+ /*Not used for 4:4:4.*/
+ int source_uv_xoffs_q16;
+};
+
+
+
+typedef void (*yuv2rgb565_row_scale_bilinear_func)(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither);
+
+typedef void (*yuv2rgb565_row_scale_nearest_func)(
+ const yuv2rgb565_row_scale_nearest_ctx *ctx, int dither);
+
+
+
+//TODO: fix NEON asm for iOS
+# if defined(MOZILLA_MAY_SUPPORT_NEON) && !defined(__APPLE__)
+
+extern "C" void ScaleYCbCr42xToRGB565_BilinearY_Row_NEON(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither);
+
+void __attribute((noinline)) yuv42x_to_rgb565_row_neon(uint16_t *dst,
+ const uint8_t *y,
+ const uint8_t *u,
+ const uint8_t *v,
+ int n,
+ int oddflag);
+
+#endif
+
+
+
+/*Bilinear interpolation of a single value.
+ This uses the exact same formulas as the asm, even though it adds some extra
+ shifts that do nothing but reduce accuracy.*/
+static int bislerp(const uint8_t *row,
+ int pitch,
+ int source_x,
+ int xweight,
+ int yweight) {
+ int a;
+ int b;
+ int c;
+ int d;
+ a = row[source_x];
+ b = row[source_x+1];
+ c = row[source_x+pitch];
+ d = row[source_x+pitch+1];
+ a = ((a<<8)+(c-a)*yweight+128)>>8;
+ b = ((b<<8)+(d-b)*yweight+128)>>8;
+ return ((a<<8)+(b-a)*xweight+128)>>8;
+}
+
+/*Convert a single pixel from Y'CbCr to RGB565.
+ This uses the exact same formulas as the asm, even though we could make the
+ constants a lot more accurate with 32-bit wide registers.*/
+static uint16_t yu2rgb565(int y, int u, int v, int dither) {
+ /*This combines the constant offset that needs to be added during the Y'CbCr
+ conversion with a rounding offset that depends on the dither parameter.*/
+ static const int DITHER_BIAS[4][3]={
+ {-14240, 8704, -17696},
+ {-14240+128,8704+64, -17696+128},
+ {-14240+256,8704+128,-17696+256},
+ {-14240+384,8704+192,-17696+384}
+ };
+ int r;
+ int g;
+ int b;
+ r = clamped((74*y+102*v+DITHER_BIAS[dither][0])>>9, 0, 31);
+ g = clamped((74*y-25*u-52*v+DITHER_BIAS[dither][1])>>8, 0, 63);
+ b = clamped((74*y+129*u+DITHER_BIAS[dither][2])>>9, 0, 31);
+ return (uint16_t)(r<<11 | g<<5 | b);
+}
+
+static void ScaleYCbCr420ToRGB565_Bilinear_Row_C(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither){
+ int x;
+ int source_x_q16;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ int source_x;
+ int xweight;
+ int y;
+ int u;
+ int v;
+ xweight = ((source_x_q16&0xFFFF)+128)>>8;
+ source_x = source_x_q16>>16;
+ y = bislerp(ctx->y_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ xweight = (((source_x_q16+ctx->source_uv_xoffs_q16)&0x1FFFF)+256)>>9;
+ source_x = (source_x_q16+ctx->source_uv_xoffs_q16)>>17;
+ source_x_q16 += ctx->source_dx_q16;
+ u = bislerp(ctx->u_row, ctx->uv_pitch, source_x, xweight, ctx->uv_yweight);
+ v = bislerp(ctx->v_row, ctx->uv_pitch, source_x, xweight, ctx->uv_yweight);
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr422ToRGB565_Bilinear_Row_C(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither){
+ int x;
+ int source_x_q16;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ int source_x;
+ int xweight;
+ int y;
+ int u;
+ int v;
+ xweight = ((source_x_q16&0xFFFF)+128)>>8;
+ source_x = source_x_q16>>16;
+ y = bislerp(ctx->y_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ xweight = (((source_x_q16+ctx->source_uv_xoffs_q16)&0x1FFFF)+256)>>9;
+ source_x = (source_x_q16+ctx->source_uv_xoffs_q16)>>17;
+ source_x_q16 += ctx->source_dx_q16;
+ u = bislerp(ctx->u_row, ctx->uv_pitch, source_x, xweight, ctx->y_yweight);
+ v = bislerp(ctx->v_row, ctx->uv_pitch, source_x, xweight, ctx->y_yweight);
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr444ToRGB565_Bilinear_Row_C(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither){
+ int x;
+ int source_x_q16;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ int source_x;
+ int xweight;
+ int y;
+ int u;
+ int v;
+ xweight = ((source_x_q16&0xFFFF)+128)>>8;
+ source_x = source_x_q16>>16;
+ source_x_q16 += ctx->source_dx_q16;
+ y = bislerp(ctx->y_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ u = bislerp(ctx->u_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ v = bislerp(ctx->v_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr42xToRGB565_BilinearY_Row_C(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither){
+ int x;
+ int source_x_q16;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ int source_x;
+ int xweight;
+ int y;
+ int u;
+ int v;
+ xweight = ((source_x_q16&0xFFFF)+128)>>8;
+ source_x = source_x_q16>>16;
+ y = bislerp(ctx->y_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ source_x = (source_x_q16+ctx->source_uv_xoffs_q16)>>17;
+ source_x_q16 += ctx->source_dx_q16;
+ u = ctx->u_row[source_x];
+ v = ctx->v_row[source_x];
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr444ToRGB565_BilinearY_Row_C(
+ const yuv2rgb565_row_scale_bilinear_ctx *ctx, int dither){
+ int x;
+ int source_x_q16;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ int source_x;
+ int xweight;
+ int y;
+ int u;
+ int v;
+ xweight = ((source_x_q16&0xFFFF)+128)>>8;
+ source_x = source_x_q16>>16;
+ y = bislerp(ctx->y_row, ctx->y_pitch, source_x, xweight, ctx->y_yweight);
+ source_x = (source_x_q16+ctx->source_uv_xoffs_q16)>>16;
+ source_x_q16 += ctx->source_dx_q16;
+ u = ctx->u_row[source_x];
+ v = ctx->v_row[source_x];
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr42xToRGB565_Nearest_Row_C(
+ const yuv2rgb565_row_scale_nearest_ctx *ctx, int dither){
+ int y;
+ int u;
+ int v;
+ int x;
+ int source_x_q16;
+ int source_x;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ source_x = source_x_q16>>16;
+ y = ctx->y_row[source_x];
+ source_x = (source_x_q16+ctx->source_uv_xoffs_q16)>>17;
+ source_x_q16 += ctx->source_dx_q16;
+ u = ctx->u_row[source_x];
+ v = ctx->v_row[source_x];
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+static void ScaleYCbCr444ToRGB565_Nearest_Row_C(
+ const yuv2rgb565_row_scale_nearest_ctx *ctx, int dither){
+ int y;
+ int u;
+ int v;
+ int x;
+ int source_x_q16;
+ int source_x;
+ source_x_q16 = ctx->source_x0_q16;
+ for (x = 0; x < ctx->width; x++) {
+ source_x = source_x_q16>>16;
+ source_x_q16 += ctx->source_dx_q16;
+ y = ctx->y_row[source_x];
+ u = ctx->u_row[source_x];
+ v = ctx->v_row[source_x];
+ ctx->rgb_row[x] = yu2rgb565(y, u, v, dither);
+ dither ^= 3;
+ }
+}
+
+void ScaleYCbCrToRGB565(const uint8_t *y_buf,
+ const uint8_t *u_buf,
+ const uint8_t *v_buf,
+ uint8_t *rgb_buf,
+ int source_x0,
+ int source_y0,
+ int source_width,
+ int source_height,
+ int width,
+ int height,
+ int y_pitch,
+ int uv_pitch,
+ int rgb_pitch,
+ YUVType yuv_type,
+ ScaleFilter filter) {
+ int source_x0_q16;
+ int source_y0_q16;
+ int source_dx_q16;
+ int source_dy_q16;
+ int source_uv_xoffs_q16;
+ int source_uv_yoffs_q16;
+ int x_shift;
+ int y_shift;
+ int ymin;
+ int ymax;
+ int uvmin;
+ int uvmax;
+ int dither;
+ /*We don't support negative destination rectangles (just flip the source
+ instead), and for empty ones there's nothing to do.*/
+ if (width <= 0 || height <= 0)
+ return;
+ /*These bounds are required to avoid 16.16 fixed-point overflow.*/
+ NS_ASSERTION(source_x0 > (INT_MIN>>16) && source_x0 < (INT_MAX>>16),
+ "ScaleYCbCrToRGB565 source X offset out of bounds.");
+ NS_ASSERTION(source_x0+source_width > (INT_MIN>>16)
+ && source_x0+source_width < (INT_MAX>>16),
+ "ScaleYCbCrToRGB565 source width out of bounds.");
+ NS_ASSERTION(source_y0 > (INT_MIN>>16) && source_y0 < (INT_MAX>>16),
+ "ScaleYCbCrToRGB565 source Y offset out of bounds.");
+ NS_ASSERTION(source_y0+source_height > (INT_MIN>>16)
+ && source_y0+source_height < (INT_MAX>>16),
+ "ScaleYCbCrToRGB565 source height out of bounds.");
+ /*We require the same stride for Y' and Cb and Cr for 4:4:4 content.*/
+ NS_ASSERTION(yuv_type != YV24 || y_pitch == uv_pitch,
+ "ScaleYCbCrToRGB565 luma stride differs from chroma for 4:4:4 content.");
+ /*We assume we can read outside the bounds of the input, because it makes
+ the code much simpler (and in practice is true: both Theora and VP8 return
+ padded reference frames).
+ In practice, we do not even _have_ the actual bounds of the source, as
+ we are passed a crop rectangle from it, and not the dimensions of the full
+ image.
+ This assertion will not guarantee our out-of-bounds reads are safe, but it
+ should at least catch the simple case of passing in an unpadded buffer.*/
+ NS_ASSERTION(abs(y_pitch) >= abs(source_width)+16,
+ "ScaleYCbCrToRGB565 source image unpadded?");
+ /*The NEON code requires the pointers to be aligned to a 16-byte boundary at
+ the start of each row.
+ This should be true for all of our sources.
+ We could try to fix this up if it's not true by adjusting source_x0, but
+ that would require the mis-alignment to be the same for the U and V
+ planes.*/
+ NS_ASSERTION((y_pitch&15) == 0 && (uv_pitch&15) == 0 &&
+ ((y_buf-(uint8_t *)nullptr)&15) == 0 &&
+ ((u_buf-(uint8_t *)nullptr)&15) == 0 &&
+ ((v_buf-(uint8_t *)nullptr)&15) == 0,
+ "ScaleYCbCrToRGB565 source image unaligned");
+ /*We take an area-based approach to pixel coverage to avoid shifting by small
+ amounts (or not so small, when up-scaling or down-scaling by a large
+ factor).
+
+ An illustrative example: scaling 4:2:0 up by 2, using JPEG chroma cositing^.
+
+ + = RGB destination locations
+ * = Y' source locations
+ - = Cb, Cr source locations
+
+ + + + + + + + +
+ * * * *
+ + + + + + + + +
+ - -
+ + + + + + + + +
+ * * * *
+ + + + + + + + +
+
+ + + + + + + + +
+ * * * *
+ + + + + + + + +
+ - -
+ + + + + + + + +
+ * * * *
+ + + + + + + + +
+
+ So, the coordinates of the upper-left + (first destination site) should
+ be (-0.25,-0.25) in the source Y' coordinate system.
+ Similarly, the coordinates should be (-0.375,-0.375) in the source Cb, Cr
+ coordinate system.
+ Note that the origin and scale of these two coordinate systems is not the
+ same!
+
+ ^JPEG cositing is required for Theora; VP8 doesn't specify cositing rules,
+ but nearly all software converters in existence (at least those that are
+ open source, and many that are not) use JPEG cositing instead of MPEG.*/
+ source_dx_q16 = (source_width<<16) / width;
+ source_x0_q16 = (source_x0<<16)+(source_dx_q16>>1)-0x8000;
+ source_dy_q16 = (source_height<<16) / height;
+ source_y0_q16 = (source_y0<<16)+(source_dy_q16>>1)-0x8000;
+ x_shift = (yuv_type != YV24);
+ y_shift = (yuv_type == YV12);
+ /*These two variables hold the difference between the origins of the Y' and
+ the Cb, Cr coordinate systems, using the scale of the Y' coordinate
+ system.*/
+ source_uv_xoffs_q16 = -(x_shift<<15);
+ source_uv_yoffs_q16 = -(y_shift<<15);
+ /*Compute the range of source rows we'll actually use.
+ This doesn't guarantee we won't read outside this range.*/
+ ymin = source_height >= 0 ? source_y0 : source_y0+source_height-1;
+ ymax = source_height >= 0 ? source_y0+source_height-1 : source_y0;
+ uvmin = ymin>>y_shift;
+ uvmax = ((ymax+1+y_shift)>>y_shift)-1;
+ /*Pick a dithering pattern.
+ The "&3" at the end is just in case RAND_MAX is lying.*/
+ dither = (rand()/(RAND_MAX>>2))&3;
+ /*Nearest-neighbor scaling.*/
+ if (filter == FILTER_NONE) {
+ yuv2rgb565_row_scale_nearest_ctx ctx;
+ yuv2rgb565_row_scale_nearest_func scale_row;
+ int y;
+ /*Add rounding offsets once, in advance.*/
+ source_x0_q16 += 0x8000;
+ source_y0_q16 += 0x8000;
+ source_uv_xoffs_q16 += (x_shift<<15);
+ source_uv_yoffs_q16 += (y_shift<<15);
+ if (yuv_type == YV12)
+ scale_row = ScaleYCbCr42xToRGB565_Nearest_Row_C;
+ else
+ scale_row = ScaleYCbCr444ToRGB565_Nearest_Row_C;
+ ctx.width = width;
+ ctx.source_x0_q16 = source_x0_q16;
+ ctx.source_dx_q16 = source_dx_q16;
+ ctx.source_uv_xoffs_q16 = source_uv_xoffs_q16;
+ for (y=0; y<height; y++) {
+ int source_y;
+ ctx.rgb_row = (uint16_t *)(rgb_buf + y*rgb_pitch);
+ source_y = source_y0_q16>>16;
+ source_y = clamped(source_y, ymin, ymax);
+ ctx.y_row = y_buf + source_y*y_pitch;
+ source_y = (source_y0_q16+source_uv_yoffs_q16)>>(16+y_shift);
+ source_y = clamped(source_y, uvmin, uvmax);
+ source_y0_q16 += source_dy_q16;
+ ctx.u_row = u_buf + source_y*uv_pitch;
+ ctx.v_row = v_buf + source_y*uv_pitch;
+ (*scale_row)(&ctx, dither);
+ dither ^= 2;
+ }
+ }
+ /*Bilinear scaling.*/
+ else {
+ yuv2rgb565_row_scale_bilinear_ctx ctx;
+ yuv2rgb565_row_scale_bilinear_func scale_row;
+ int uvxscale_min;
+ int uvxscale_max;
+ int uvyscale_min;
+ int uvyscale_max;
+ int y;
+ /*Check how close the chroma scaling is to unity.
+ If it's close enough, we can get away with nearest-neighbor chroma
+ sub-sampling, and only doing bilinear on luma.
+ If a given axis is subsampled, we use bounds on the luma step of
+ [0.67...2], which is equivalent to scaling chroma by [1...3].
+ If it's not subsampled, we use bounds of [0.5...1.33], which is
+ equivalent to scaling chroma by [0.75...2].
+ The lower bound is chosen as a trade-off between speed and how terrible
+ nearest neighbor looks when upscaling.*/
+# define CHROMA_NEAREST_SUBSAMP_STEP_MIN 0xAAAA
+# define CHROMA_NEAREST_NORMAL_STEP_MIN 0x8000
+# define CHROMA_NEAREST_SUBSAMP_STEP_MAX 0x20000
+# define CHROMA_NEAREST_NORMAL_STEP_MAX 0x15555
+ uvxscale_min = yuv_type != YV24 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MIN : CHROMA_NEAREST_NORMAL_STEP_MIN;
+ uvxscale_max = yuv_type != YV24 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MAX : CHROMA_NEAREST_NORMAL_STEP_MAX;
+ uvyscale_min = yuv_type == YV12 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MIN : CHROMA_NEAREST_NORMAL_STEP_MIN;
+ uvyscale_max = yuv_type == YV12 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MAX : CHROMA_NEAREST_NORMAL_STEP_MAX;
+ if (uvxscale_min <= abs(source_dx_q16)
+ && abs(source_dx_q16) <= uvxscale_max
+ && uvyscale_min <= abs(source_dy_q16)
+ && abs(source_dy_q16) <= uvyscale_max) {
+ /*Add the rounding offsets now.*/
+ source_uv_xoffs_q16 += 1<<(15+x_shift);
+ source_uv_yoffs_q16 += 1<<(15+y_shift);
+ if (yuv_type != YV24) {
+ scale_row =
+//TODO: fix NEON asm for iOS
+# if defined(MOZILLA_MAY_SUPPORT_NEON) && !defined(__APPLE__)
+ supports_neon() ? ScaleYCbCr42xToRGB565_BilinearY_Row_NEON :
+# endif
+ ScaleYCbCr42xToRGB565_BilinearY_Row_C;
+ }
+ else
+ scale_row = ScaleYCbCr444ToRGB565_BilinearY_Row_C;
+ }
+ else {
+ if (yuv_type == YV12)
+ scale_row = ScaleYCbCr420ToRGB565_Bilinear_Row_C;
+ else if (yuv_type == YV16)
+ scale_row = ScaleYCbCr422ToRGB565_Bilinear_Row_C;
+ else
+ scale_row = ScaleYCbCr444ToRGB565_Bilinear_Row_C;
+ }
+ ctx.width = width;
+ ctx.y_pitch = y_pitch;
+ ctx.source_x0_q16 = source_x0_q16;
+ ctx.source_dx_q16 = source_dx_q16;
+ ctx.source_uv_xoffs_q16 = source_uv_xoffs_q16;
+ ctx.uv_pitch = uv_pitch;
+ for (y=0; y<height; y++) {
+ int source_y;
+ int yweight;
+ int uvweight;
+ ctx.rgb_row = (uint16_t *)(rgb_buf + y*rgb_pitch);
+ source_y = (source_y0_q16+128)>>16;
+ yweight = ((source_y0_q16+128)>>8)&0xFF;
+ if (source_y < ymin) {
+ source_y = ymin;
+ yweight = 0;
+ }
+ if (source_y > ymax) {
+ source_y = ymax;
+ yweight = 0;
+ }
+ ctx.y_row = y_buf + source_y*y_pitch;
+ source_y = source_y0_q16+source_uv_yoffs_q16+(128<<y_shift);
+ source_y0_q16 += source_dy_q16;
+ uvweight = source_y>>(8+y_shift)&0xFF;
+ source_y >>= 16+y_shift;
+ if (source_y < uvmin) {
+ source_y = uvmin;
+ uvweight = 0;
+ }
+ if (source_y > uvmax) {
+ source_y = uvmax;
+ uvweight = 0;
+ }
+ ctx.u_row = u_buf + source_y*uv_pitch;
+ ctx.v_row = v_buf + source_y*uv_pitch;
+ ctx.y_yweight = yweight;
+ ctx.uv_yweight = uvweight;
+ (*scale_row)(&ctx, dither);
+ dither ^= 2;
+ }
+ }
+}
+
+bool IsScaleYCbCrToRGB565Fast(int source_x0,
+ int source_y0,
+ int source_width,
+ int source_height,
+ int width,
+ int height,
+ YUVType yuv_type,
+ ScaleFilter filter)
+{
+ // Very fast.
+ if (width <= 0 || height <= 0)
+ return true;
+# if defined(MOZILLA_MAY_SUPPORT_NEON)
+ if (filter != FILTER_NONE) {
+ int source_dx_q16;
+ int source_dy_q16;
+ int uvxscale_min;
+ int uvxscale_max;
+ int uvyscale_min;
+ int uvyscale_max;
+ source_dx_q16 = (source_width<<16) / width;
+ source_dy_q16 = (source_height<<16) / height;
+ uvxscale_min = yuv_type != YV24 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MIN : CHROMA_NEAREST_NORMAL_STEP_MIN;
+ uvxscale_max = yuv_type != YV24 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MAX : CHROMA_NEAREST_NORMAL_STEP_MAX;
+ uvyscale_min = yuv_type == YV12 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MIN : CHROMA_NEAREST_NORMAL_STEP_MIN;
+ uvyscale_max = yuv_type == YV12 ?
+ CHROMA_NEAREST_SUBSAMP_STEP_MAX : CHROMA_NEAREST_NORMAL_STEP_MAX;
+ if (uvxscale_min <= abs(source_dx_q16)
+ && abs(source_dx_q16) <= uvxscale_max
+ && uvyscale_min <= abs(source_dy_q16)
+ && abs(source_dy_q16) <= uvyscale_max) {
+ if (yuv_type != YV24)
+ return supports_neon();
+ }
+ }
+# endif
+ return false;
+}
+
+
+
+void yuv_to_rgb565_row_c(uint16_t *dst,
+ const uint8_t *y,
+ const uint8_t *u,
+ const uint8_t *v,
+ int x_shift,
+ int pic_x,
+ int pic_width)
+{
+ int x;
+ for (x = 0; x < pic_width; x++)
+ {
+ dst[x] = yu2rgb565(y[pic_x+x],
+ u[(pic_x+x)>>x_shift],
+ v[(pic_x+x)>>x_shift],
+ 2); // Disable dithering for now.
+ }
+}
+
+void ConvertYCbCrToRGB565(const uint8_t* y_buf,
+ const uint8_t* u_buf,
+ const uint8_t* v_buf,
+ uint8_t* rgb_buf,
+ int pic_x,
+ int pic_y,
+ int pic_width,
+ int pic_height,
+ int y_pitch,
+ int uv_pitch,
+ int rgb_pitch,
+ YUVType yuv_type)
+{
+ int x_shift;
+ int y_shift;
+ x_shift = yuv_type != YV24;
+ y_shift = yuv_type == YV12;
+//TODO: fix NEON asm for iOS
+# if defined(MOZILLA_MAY_SUPPORT_NEON) && !defined(__APPLE__)
+ if (yuv_type != YV24 && supports_neon())
+ {
+ for (int i = 0; i < pic_height; i++) {
+ int yoffs;
+ int uvoffs;
+ yoffs = y_pitch * (pic_y+i) + pic_x;
+ uvoffs = uv_pitch * ((pic_y+i)>>y_shift) + (pic_x>>x_shift);
+ yuv42x_to_rgb565_row_neon((uint16_t*)(rgb_buf + rgb_pitch * i),
+ y_buf + yoffs,
+ u_buf + uvoffs,
+ v_buf + uvoffs,
+ pic_width,
+ pic_x&x_shift);
+ }
+ }
+ else
+# endif
+ {
+ for (int i = 0; i < pic_height; i++) {
+ int yoffs;
+ int uvoffs;
+ yoffs = y_pitch * (pic_y+i);
+ uvoffs = uv_pitch * ((pic_y+i)>>y_shift);
+ yuv_to_rgb565_row_c((uint16_t*)(rgb_buf + rgb_pitch * i),
+ y_buf + yoffs,
+ u_buf + uvoffs,
+ v_buf + uvoffs,
+ x_shift,
+ pic_x,
+ pic_width);
+ }
+ }
+}
+
+bool IsConvertYCbCrToRGB565Fast(int pic_x,
+ int pic_y,
+ int pic_width,
+ int pic_height,
+ YUVType yuv_type)
+{
+# if defined(MOZILLA_MAY_SUPPORT_NEON)
+ return (yuv_type != YV24 && supports_neon());
+# else
+ return false;
+# endif
+}
+
+} // namespace gfx
+
+} // namespace mozilla
+
+#endif // HAVE_YCBCR_TO_RGB565
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 06:09:46 +0000