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Unified Diff: third_party/libwebp/utils/rescaler.c

Issue 1546003002: libwebp: update to 0.5.0 (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: rebase Created 5 years ago
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Index: third_party/libwebp/utils/rescaler.c
diff --git a/third_party/libwebp/utils/rescaler.c b/third_party/libwebp/utils/rescaler.c
index 3a43229127fd52f93bc09c978640bdf1472de95a..00c9300bfbdd5009e88f87e45b9a59f158584884 100644
--- a/third_party/libwebp/utils/rescaler.c
+++ b/third_party/libwebp/utils/rescaler.c
@@ -14,451 +14,8 @@
#include <assert.h>
#include <stdlib.h>
#include <string.h>
-#include "./rescaler.h"
#include "../dsp/dsp.h"
-
-//------------------------------------------------------------------------------
-// Implementations of critical functions ImportRow / ExportRow
-
-// Import a row of data and save its contribution in the rescaler.
-// 'channel' denotes the channel number to be imported. 'Expand' corresponds to
-// the wrk->x_expand case. Otherwise, 'Shrink' is to be used.
-typedef void (*WebPRescalerImportRowFunc)(WebPRescaler* const wrk,
- const uint8_t* src);
-static WebPRescalerImportRowFunc WebPRescalerImportRowExpand;
-static WebPRescalerImportRowFunc WebPRescalerImportRowShrink;
-
-// Export one row (starting at x_out position) from rescaler.
-// 'Expand' corresponds to the wrk->y_expand case.
-// Otherwise 'Shrink' is to be used
-typedef void (*WebPRescalerExportRowFunc)(WebPRescaler* const wrk);
-static WebPRescalerExportRowFunc WebPRescalerExportRowExpand;
-static WebPRescalerExportRowFunc WebPRescalerExportRowShrink;
-
-#define WEBP_RESCALER_RFIX 32 // fixed-point precision for multiplies
-#define WEBP_RESCALER_ONE (1ull << WEBP_RESCALER_RFIX)
-#define WEBP_RESCALER_FRAC(x, y) \
- ((uint32_t)(((uint64_t)(x) << WEBP_RESCALER_RFIX) / (y)))
-#define ROUNDER (WEBP_RESCALER_ONE >> 1)
-#define MULT_FIX(x, y) (((uint64_t)(x) * (y) + ROUNDER) >> WEBP_RESCALER_RFIX)
-
-static void ImportRowExpandC(WebPRescaler* const wrk, const uint8_t* src) {
- const int x_stride = wrk->num_channels;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- int channel;
- assert(!WebPRescalerInputDone(wrk));
- assert(wrk->x_expand);
- for (channel = 0; channel < x_stride; ++channel) {
- int x_in = channel;
- int x_out = channel;
- // simple bilinear interpolation
- int accum = wrk->x_add;
- int left = src[x_in];
- int right = (wrk->src_width > 1) ? src[x_in + x_stride] : left;
- x_in += x_stride;
- while (1) {
- wrk->frow[x_out] = right * wrk->x_add + (left - right) * accum;
- x_out += x_stride;
- if (x_out >= x_out_max) break;
- accum -= wrk->x_sub;
- if (accum < 0) {
- left = right;
- x_in += x_stride;
- assert(x_in < wrk->src_width * x_stride);
- right = src[x_in];
- accum += wrk->x_add;
- }
- }
- assert(wrk->x_sub == 0 /* <- special case for src_width=1 */ || accum == 0);
- }
-}
-
-static void ImportRowShrinkC(WebPRescaler* const wrk, const uint8_t* src) {
- const int x_stride = wrk->num_channels;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- int channel;
- assert(!WebPRescalerInputDone(wrk));
- assert(!wrk->x_expand);
- for (channel = 0; channel < x_stride; ++channel) {
- int x_in = channel;
- int x_out = channel;
- uint32_t sum = 0;
- int accum = 0;
- while (x_out < x_out_max) {
- uint32_t base = 0;
- accum += wrk->x_add;
- while (accum > 0) {
- accum -= wrk->x_sub;
- assert(x_in < wrk->src_width * x_stride);
- base = src[x_in];
- sum += base;
- x_in += x_stride;
- }
- { // Emit next horizontal pixel.
- const rescaler_t frac = base * (-accum);
- wrk->frow[x_out] = sum * wrk->x_sub - frac;
- // fresh fractional start for next pixel
- sum = (int)MULT_FIX(frac, wrk->fx_scale);
- }
- x_out += x_stride;
- }
- assert(accum == 0);
- }
-}
-
-//------------------------------------------------------------------------------
-// Row export
-
-static void ExportRowExpandC(WebPRescaler* const wrk) {
- int x_out;
- uint8_t* const dst = wrk->dst;
- rescaler_t* const irow = wrk->irow;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- const rescaler_t* const frow = wrk->frow;
- assert(!WebPRescalerOutputDone(wrk));
- assert(wrk->y_accum <= 0);
- assert(wrk->y_expand);
- assert(wrk->y_sub != 0);
- if (wrk->y_accum == 0) {
- for (x_out = 0; x_out < x_out_max; ++x_out) {
- const uint32_t J = frow[x_out];
- const int v = (int)MULT_FIX(J, wrk->fy_scale);
- assert(v >= 0 && v <= 255);
- dst[x_out] = v;
- }
- } else {
- const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
- const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
- for (x_out = 0; x_out < x_out_max; ++x_out) {
- const uint64_t I = (uint64_t)A * frow[x_out]
- + (uint64_t)B * irow[x_out];
- const uint32_t J = (uint32_t)((I + ROUNDER) >> WEBP_RESCALER_RFIX);
- const int v = (int)MULT_FIX(J, wrk->fy_scale);
- assert(v >= 0 && v <= 255);
- dst[x_out] = v;
- }
- }
-}
-
-static void ExportRowShrinkC(WebPRescaler* const wrk) {
- int x_out;
- uint8_t* const dst = wrk->dst;
- rescaler_t* const irow = wrk->irow;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- const rescaler_t* const frow = wrk->frow;
- const uint32_t yscale = wrk->fy_scale * (-wrk->y_accum);
- assert(!WebPRescalerOutputDone(wrk));
- assert(wrk->y_accum <= 0);
- assert(!wrk->y_expand);
- if (yscale) {
- for (x_out = 0; x_out < x_out_max; ++x_out) {
- const uint32_t frac = (uint32_t)MULT_FIX(frow[x_out], yscale);
- const int v = (int)MULT_FIX(irow[x_out] - frac, wrk->fxy_scale);
- assert(v >= 0 && v <= 255);
- dst[x_out] = v;
- irow[x_out] = frac; // new fractional start
- }
- } else {
- for (x_out = 0; x_out < x_out_max; ++x_out) {
- const int v = (int)MULT_FIX(irow[x_out], wrk->fxy_scale);
- assert(v >= 0 && v <= 255);
- dst[x_out] = v;
- irow[x_out] = 0;
- }
- }
-}
-
-//------------------------------------------------------------------------------
-// Main entry calls
-
-void WebPRescalerImportRow(WebPRescaler* const wrk, const uint8_t* src) {
- assert(!WebPRescalerInputDone(wrk));
- if (!wrk->x_expand) {
- WebPRescalerImportRowShrink(wrk, src);
- } else {
- WebPRescalerImportRowExpand(wrk, src);
- }
-}
-
-void WebPRescalerExportRow(WebPRescaler* const wrk) {
- if (wrk->y_accum <= 0) {
- assert(!WebPRescalerOutputDone(wrk));
- if (wrk->y_expand) {
- WebPRescalerExportRowExpand(wrk);
- } else if (wrk->fxy_scale) {
- WebPRescalerExportRowShrink(wrk);
- } else { // very special case for src = dst = 1x1
- int i;
- assert(wrk->src_width == 1 && wrk->dst_width <= 2);
- assert(wrk->src_height == 1 && wrk->dst_height == 1);
- for (i = 0; i < wrk->num_channels * wrk->dst_width; ++i) {
- wrk->dst[i] = wrk->irow[i];
- wrk->irow[i] = 0;
- }
- }
- wrk->y_accum += wrk->y_add;
- wrk->dst += wrk->dst_stride;
- ++wrk->dst_y;
- }
-}
-
-//------------------------------------------------------------------------------
-// MIPS version
-
-#if defined(WEBP_USE_MIPS32)
-
-static void ImportRowShrinkMIPS(WebPRescaler* const wrk, const uint8_t* src) {
- const int x_stride = wrk->num_channels;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- const int fx_scale = wrk->fx_scale;
- const int x_add = wrk->x_add;
- const int x_sub = wrk->x_sub;
- const int x_stride1 = x_stride << 2;
- int channel;
- assert(!wrk->x_expand);
- assert(!WebPRescalerInputDone(wrk));
-
- for (channel = 0; channel < x_stride; ++channel) {
- const uint8_t* src1 = src + channel;
- rescaler_t* frow = wrk->frow + channel;
- int temp1, temp2, temp3;
- int base, frac, sum;
- int accum, accum1;
- int loop_c = x_out_max - channel;
-
- __asm__ volatile (
- "li %[temp1], 0x8000 \n\t"
- "li %[temp2], 0x10000 \n\t"
- "li %[sum], 0 \n\t"
- "li %[accum], 0 \n\t"
- "1: \n\t"
- "addu %[accum], %[accum], %[x_add] \n\t"
- "li %[base], 0 \n\t"
- "blez %[accum], 3f \n\t"
- "2: \n\t"
- "lbu %[base], 0(%[src1]) \n\t"
- "subu %[accum], %[accum], %[x_sub] \n\t"
- "addu %[src1], %[src1], %[x_stride] \n\t"
- "addu %[sum], %[sum], %[base] \n\t"
- "bgtz %[accum], 2b \n\t"
- "3: \n\t"
- "negu %[accum1], %[accum] \n\t"
- "mul %[frac], %[base], %[accum1] \n\t"
- "mul %[temp3], %[sum], %[x_sub] \n\t"
- "subu %[loop_c], %[loop_c], %[x_stride] \n\t"
- "mult %[temp1], %[temp2] \n\t"
- "maddu %[frac], %[fx_scale] \n\t"
- "mfhi %[sum] \n\t"
- "subu %[temp3], %[temp3], %[frac] \n\t"
- "sw %[temp3], 0(%[frow]) \n\t"
- "addu %[frow], %[frow], %[x_stride1] \n\t"
- "bgtz %[loop_c], 1b \n\t"
- : [accum]"=&r"(accum), [src1]"+r"(src1), [temp3]"=&r"(temp3),
- [sum]"=&r"(sum), [base]"=&r"(base), [frac]"=&r"(frac),
- [frow]"+r"(frow), [accum1]"=&r"(accum1),
- [temp2]"=&r"(temp2), [temp1]"=&r"(temp1)
- : [x_stride]"r"(x_stride), [fx_scale]"r"(fx_scale),
- [x_sub]"r"(x_sub), [x_add]"r"(x_add),
- [loop_c]"r"(loop_c), [x_stride1]"r"(x_stride1)
- : "memory", "hi", "lo"
- );
- assert(accum == 0);
- }
-}
-
-static void ImportRowExpandMIPS(WebPRescaler* const wrk, const uint8_t* src) {
- const int x_stride = wrk->num_channels;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- const int x_add = wrk->x_add;
- const int x_sub = wrk->x_sub;
- const int src_width = wrk->src_width;
- const int x_stride1 = x_stride << 2;
- int channel;
- assert(wrk->x_expand);
- assert(!WebPRescalerInputDone(wrk));
-
- for (channel = 0; channel < x_stride; ++channel) {
- const uint8_t* src1 = src + channel;
- rescaler_t* frow = wrk->frow + channel;
- int temp1, temp2, temp3, temp4;
- int frac;
- int accum;
- int x_out = channel;
-
- __asm__ volatile (
- "addiu %[temp3], %[src_width], -1 \n\t"
- "lbu %[temp2], 0(%[src1]) \n\t"
- "addu %[src1], %[src1], %[x_stride] \n\t"
- "bgtz %[temp3], 0f \n\t"
- "addiu %[temp1], %[temp2], 0 \n\t"
- "b 3f \n\t"
- "0: \n\t"
- "lbu %[temp1], 0(%[src1]) \n\t"
- "3: \n\t"
- "addiu %[accum], %[x_add], 0 \n\t"
- "1: \n\t"
- "subu %[temp3], %[temp2], %[temp1] \n\t"
- "mul %[temp3], %[temp3], %[accum] \n\t"
- "mul %[temp4], %[temp1], %[x_add] \n\t"
- "addu %[temp3], %[temp4], %[temp3] \n\t"
- "sw %[temp3], 0(%[frow]) \n\t"
- "addu %[frow], %[frow], %[x_stride1] \n\t"
- "addu %[x_out], %[x_out], %[x_stride] \n\t"
- "subu %[temp3], %[x_out], %[x_out_max] \n\t"
- "bgez %[temp3], 2f \n\t"
- "subu %[accum], %[accum], %[x_sub] \n\t"
- "bgez %[accum], 4f \n\t"
- "addiu %[temp2], %[temp1], 0 \n\t"
- "addu %[src1], %[src1], %[x_stride] \n\t"
- "lbu %[temp1], 0(%[src1]) \n\t"
- "addu %[accum], %[accum], %[x_add] \n\t"
- "4: \n\t"
- "b 1b \n\t"
- "2: \n\t"
- : [src1]"+r"(src1), [accum]"=&r"(accum), [temp1]"=&r"(temp1),
- [temp2]"=&r"(temp2), [temp3]"=&r"(temp3), [temp4]"=&r"(temp4),
- [x_out]"+r"(x_out), [frac]"=&r"(frac), [frow]"+r"(frow)
- : [x_stride]"r"(x_stride), [x_add]"r"(x_add), [x_sub]"r"(x_sub),
- [x_stride1]"r"(x_stride1), [src_width]"r"(src_width),
- [x_out_max]"r"(x_out_max)
- : "memory", "hi", "lo"
- );
- assert(wrk->x_sub == 0 /* <- special case for src_width=1 */ || accum == 0);
- }
-}
-
-//------------------------------------------------------------------------------
-// Row export
-
-static void ExportRowExpandMIPS(WebPRescaler* const wrk) {
- uint8_t* dst = wrk->dst;
- rescaler_t* irow = wrk->irow;
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- const rescaler_t* frow = wrk->frow;
- int temp0, temp1, temp3, temp4, temp5, loop_end;
- const int temp2 = (int)wrk->fy_scale;
- const int temp6 = x_out_max << 2;
- assert(!WebPRescalerOutputDone(wrk));
- assert(wrk->y_accum <= 0);
- assert(wrk->y_expand);
- assert(wrk->y_sub != 0);
- if (wrk->y_accum == 0) {
- __asm__ volatile (
- "li %[temp3], 0x10000 \n\t"
- "li %[temp4], 0x8000 \n\t"
- "addu %[loop_end], %[frow], %[temp6] \n\t"
- "1: \n\t"
- "lw %[temp0], 0(%[frow]) \n\t"
- "addiu %[dst], %[dst], 1 \n\t"
- "addiu %[frow], %[frow], 4 \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "maddu %[temp0], %[temp2] \n\t"
- "mfhi %[temp5] \n\t"
- "sb %[temp5], -1(%[dst]) \n\t"
- "bne %[frow], %[loop_end], 1b \n\t"
- : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
- [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
- [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
- : [temp2]"r"(temp2), [temp6]"r"(temp6)
- : "memory", "hi", "lo"
- );
- } else {
- const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
- const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
- __asm__ volatile (
- "li %[temp3], 0x10000 \n\t"
- "li %[temp4], 0x8000 \n\t"
- "addu %[loop_end], %[frow], %[temp6] \n\t"
- "1: \n\t"
- "lw %[temp0], 0(%[frow]) \n\t"
- "lw %[temp1], 0(%[irow]) \n\t"
- "addiu %[dst], %[dst], 1 \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "maddu %[A], %[temp0] \n\t"
- "maddu %[B], %[temp1] \n\t"
- "addiu %[frow], %[frow], 4 \n\t"
- "addiu %[irow], %[irow], 4 \n\t"
- "mfhi %[temp5] \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "maddu %[temp5], %[temp2] \n\t"
- "mfhi %[temp5] \n\t"
- "sb %[temp5], -1(%[dst]) \n\t"
- "bne %[frow], %[loop_end], 1b \n\t"
- : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
- [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
- [irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
- : [temp2]"r"(temp2), [temp6]"r"(temp6), [A]"r"(A), [B]"r"(B)
- : "memory", "hi", "lo"
- );
- }
-}
-
-static void ExportRowShrinkMIPS(WebPRescaler* const wrk) {
- const int x_out_max = wrk->dst_width * wrk->num_channels;
- uint8_t* dst = wrk->dst;
- rescaler_t* irow = wrk->irow;
- const rescaler_t* frow = wrk->frow;
- const int yscale = wrk->fy_scale * (-wrk->y_accum);
- int temp0, temp1, temp3, temp4, temp5, loop_end;
- const int temp2 = (int)wrk->fxy_scale;
- const int temp6 = x_out_max << 2;
-
- assert(!WebPRescalerOutputDone(wrk));
- assert(wrk->y_accum <= 0);
- assert(!wrk->y_expand);
- assert(wrk->fxy_scale != 0);
- if (yscale) {
- __asm__ volatile (
- "li %[temp3], 0x10000 \n\t"
- "li %[temp4], 0x8000 \n\t"
- "addu %[loop_end], %[frow], %[temp6] \n\t"
- "1: \n\t"
- "lw %[temp0], 0(%[frow]) \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "addiu %[frow], %[frow], 4 \n\t"
- "maddu %[temp0], %[yscale] \n\t"
- "mfhi %[temp1] \n\t"
- "lw %[temp0], 0(%[irow]) \n\t"
- "addiu %[dst], %[dst], 1 \n\t"
- "addiu %[irow], %[irow], 4 \n\t"
- "subu %[temp0], %[temp0], %[temp1] \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "maddu %[temp0], %[temp2] \n\t"
- "mfhi %[temp5] \n\t"
- "sw %[temp1], -4(%[irow]) \n\t"
- "sb %[temp5], -1(%[dst]) \n\t"
- "bne %[frow], %[loop_end], 1b \n\t"
- : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
- [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
- [irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
- : [temp2]"r"(temp2), [yscale]"r"(yscale), [temp6]"r"(temp6)
- : "memory", "hi", "lo"
- );
- } else {
- __asm__ volatile (
- "li %[temp3], 0x10000 \n\t"
- "li %[temp4], 0x8000 \n\t"
- "addu %[loop_end], %[irow], %[temp6] \n\t"
- "1: \n\t"
- "lw %[temp0], 0(%[irow]) \n\t"
- "addiu %[dst], %[dst], 1 \n\t"
- "addiu %[irow], %[irow], 4 \n\t"
- "mult %[temp3], %[temp4] \n\t"
- "maddu %[temp0], %[temp2] \n\t"
- "mfhi %[temp5] \n\t"
- "sw $zero, -4(%[irow]) \n\t"
- "sb %[temp5], -1(%[dst]) \n\t"
- "bne %[irow], %[loop_end], 1b \n\t"
- : [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
- [temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [irow]"+r"(irow),
- [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
- : [temp2]"r"(temp2), [temp6]"r"(temp6)
- : "memory", "hi", "lo"
- );
- }
-}
-
-#endif // WEBP_USE_MIPS32
+#include "./rescaler.h"
//------------------------------------------------------------------------------
@@ -510,30 +67,37 @@ void WebPRescalerInit(WebPRescaler* const wrk, int src_width, int src_height,
wrk->frow = work + num_channels * dst_width;
memset(work, 0, 2 * dst_width * num_channels * sizeof(*work));
- if (WebPRescalerImportRowExpand == NULL) {
- WebPRescalerImportRowExpand = ImportRowExpandC;
- WebPRescalerImportRowShrink = ImportRowShrinkC;
- WebPRescalerExportRowExpand = ExportRowExpandC;
- WebPRescalerExportRowShrink = ExportRowShrinkC;
- if (VP8GetCPUInfo != NULL) {
-#if defined(WEBP_USE_MIPS32)
- if (VP8GetCPUInfo(kMIPS32)) {
- WebPRescalerImportRowExpand = ImportRowExpandMIPS;
- WebPRescalerImportRowShrink = ImportRowShrinkMIPS;
- WebPRescalerExportRowExpand = ExportRowExpandMIPS;
- WebPRescalerExportRowShrink = ExportRowShrinkMIPS;
- }
-#endif
+ WebPRescalerDspInit();
+}
+
+int WebPRescalerGetScaledDimensions(int src_width, int src_height,
+ int* const scaled_width,
+ int* const scaled_height) {
+ assert(scaled_width != NULL);
+ assert(scaled_height != NULL);
+ {
+ int width = *scaled_width;
+ int height = *scaled_height;
+
+ // if width is unspecified, scale original proportionally to height ratio.
+ if (width == 0) {
+ width = (src_width * height + src_height / 2) / src_height;
}
+ // if height is unspecified, scale original proportionally to width ratio.
+ if (height == 0) {
+ height = (src_height * width + src_width / 2) / src_width;
+ }
+ // Check if the overall dimensions still make sense.
+ if (width <= 0 || height <= 0) {
+ return 0;
+ }
+
+ *scaled_width = width;
+ *scaled_height = height;
+ return 1;
}
}
-#undef MULT_FIX
-#undef WEBP_RESCALER_RFIX
-#undef WEBP_RESCALER_ONE
-#undef WEBP_RESCALER_FRAC
-#undef ROUNDER
-
//------------------------------------------------------------------------------
// all-in-one calls
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