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author | The Android Open Source Project <initial-contribution@android.com> | 2009-01-15 16:12:07 -0800 |
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committer | The Android Open Source Project <initial-contribution@android.com> | 2009-01-15 16:12:07 -0800 |
commit | 66339ad5cebeae8f4cbf7e335c67368abbb91223 (patch) | |
tree | 636e9712a4a3ff5439d2925d08cd5cc30de353cc /tools/rgb2565 | |
parent | 4f85cc54b3347e00e32a07cae4fd5473987b71af (diff) | |
download | build-66339ad5cebeae8f4cbf7e335c67368abbb91223.tar.gz build-66339ad5cebeae8f4cbf7e335c67368abbb91223.tar.bz2 build-66339ad5cebeae8f4cbf7e335c67368abbb91223.zip |
auto import from //branches/cupcake/...@126645
Diffstat (limited to 'tools/rgb2565')
-rw-r--r-- | tools/rgb2565/to565.c | 78 |
1 files changed, 73 insertions, 5 deletions
diff --git a/tools/rgb2565/to565.c b/tools/rgb2565/to565.c index 01d14aac2..abf9cdb26 100644 --- a/tools/rgb2565/to565.c +++ b/tools/rgb2565/to565.c @@ -13,20 +13,24 @@ * See the License for the specific language governing permissions and * limitations under the License. */ - + #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> -#define to565(r,g,b) \ +#define to565(r,g,b) \ ((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3)) +#define from565_r(x) ((((x) >> 11) & 0x1f) * 255 / 31) +#define from565_g(x) ((((x) >> 5) & 0x3f) * 255 / 63) +#define from565_b(x) (((x) & 0x1f) * 255 / 31) + void to_565_raw(void) { unsigned char in[3]; unsigned short out; - + while(read(0, in, 3) == 3) { out = to565(in[0],in[1],in[2]); write(1, &out, 2); @@ -34,6 +38,66 @@ void to_565_raw(void) return; } +void to_565_raw_dither(int width) +{ + unsigned char in[3]; + unsigned short out; + int i = 0; + int e; + + int* error = malloc((width+2) * 3 * sizeof(int)); + int* next_error = malloc((width+2) * 3 * sizeof(int)); + memset(error, 0, (width+2) * 3 * sizeof(int)); + memset(next_error, 0, (width+2) * 3 * sizeof(int)); + error += 3; // array goes from [-3..((width+1)*3+2)] + next_error += 3; + + while(read(0, in, 3) == 3) { + int r = in[0] + error[i*3+0]; + int rb = (r < 0) ? 0 : ((r > 255) ? 255 : r); + + int g = in[1] + error[i*3+1]; + int gb = (g < 0) ? 0 : ((g > 255) ? 255 : g); + + int b = in[2] + error[i*3+2]; + int bb = (b < 0) ? 0 : ((b > 255) ? 255 : b); + + out = to565(rb, gb, bb); + write(1, &out, 2); + +#define apply_error(ch) { \ + next_error[(i-1)*3+ch] += e * 3 / 16; \ + next_error[(i)*3+ch] += e * 5 / 16; \ + next_error[(i+1)*3+ch] += e * 1 / 16; \ + error[(i+1)*3+ch] += e - ((e*1/16) + (e*3/16) + (e*5/16)); \ + } + + e = r - from565_r(out); + apply_error(0); + + e = g - from565_g(out); + apply_error(1); + + e = b - from565_b(out); + apply_error(2); + +#undef apply_error + + ++i; + if (i == width) { + // error <- next_error; next_error <- 0 + int* temp = error; error = next_error; next_error = temp; + memset(next_error, 0, (width+1) * 3 * sizeof(int)); + i = 0; + } + } + + free(error-3); + free(next_error-3); + + return; +} + void to_565_rle(void) { unsigned char in[3]; @@ -66,10 +130,14 @@ void to_565_rle(void) int main(int argc, char **argv) { - if ((argc > 1) && (!strcmp(argv[1],"-rle"))) { + if ((argc == 2) && (!strcmp(argv[1],"-rle"))) { to_565_rle(); } else { - to_565_raw(); + if (argc > 2 && (!strcmp(argv[1], "-w"))) { + to_565_raw_dither(atoi(argv[2])); + } else { + to_565_raw(); + } } return 0; } |