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fix bug 426657: need to clamp RGBA before color table lookups

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This commit is contained in:
Brian Paul 2001-05-23 23:55:01 +00:00
parent 6f0ab1d868
commit f6e0e92beb
1 changed files with 63 additions and 27 deletions
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90
src/mesa/main/pixel.c
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@ -1,4 +1,4 @@
/* $Id: pixel.c,v 1.28 2001/04/10 15:25:45 brianp Exp $ */
/* $Id: pixel.c,v 1.29 2001/05/23 23:55:01 brianp Exp $ */
/*
* Mesa 3-D graphics library
@ -832,10 +832,14 @@ _mesa_map_rgba( const GLcontext *ctx, GLuint n, GLfloat rgba[][4] )
const GLfloat *aMap = ctx->Pixel.MapAtoA;
GLuint i;
for (i=0;i<n;i++) {
rgba[i][RCOMP] = rMap[IROUND(rgba[i][RCOMP] * rscale)];
rgba[i][GCOMP] = gMap[IROUND(rgba[i][GCOMP] * gscale)];
rgba[i][BCOMP] = bMap[IROUND(rgba[i][BCOMP] * bscale)];
rgba[i][ACOMP] = aMap[IROUND(rgba[i][ACOMP] * ascale)];
GLfloat r = CLAMP(rgba[i][RCOMP], 0.0F, 1.0F);
GLfloat g = CLAMP(rgba[i][GCOMP], 0.0F, 1.0F);
GLfloat b = CLAMP(rgba[i][BCOMP], 0.0F, 1.0F);
GLfloat a = CLAMP(rgba[i][ACOMP], 0.0F, 1.0F);
rgba[i][RCOMP] = rMap[IROUND(r * rscale)];
rgba[i][GCOMP] = gMap[IROUND(g * gscale)];
rgba[i][BCOMP] = bMap[IROUND(b * bscale)];
rgba[i][ACOMP] = aMap[IROUND(a * ascale)];
}
}
@ -884,24 +888,26 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
case GL_INTENSITY:
/* replace RGBA with I */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][RCOMP] * scale);
GLfloat c = CHAN_TO_FLOAT(lut[j]);
GLfloat c = CHAN_TO_FLOAT(lut[CLAMP(j, 0, 1)]);
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][RCOMP] * scale);
GLfloat c = lut[j];
GLfloat c = lut[CLAMP(j, 0, max)];
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
@ -910,22 +916,24 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
case GL_LUMINANCE:
/* replace RGB with L */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][RCOMP] * scale);
GLfloat c = CHAN_TO_FLOAT(lut[j]);
GLfloat c = CHAN_TO_FLOAT(lut[CLAMP(j, 0, max)]);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][RCOMP] * scale);
GLfloat c = lut[j];
GLfloat c = lut[CLAMP(j, 0, max)];
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
@ -933,48 +941,58 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
case GL_ALPHA:
/* replace A with A */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][ACOMP] * scale);
rgba[i][ACOMP] = CHAN_TO_FLOAT(lut[j]);
rgba[i][ACOMP] = CHAN_TO_FLOAT(lut[CLAMP(j, 0, max)]);
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND(rgba[i][ACOMP] * scale);
rgba[i][ACOMP] = lut[j];
rgba[i][ACOMP] = lut[CLAMP(j, 0, max)];
}
}
break;
case GL_LUMINANCE_ALPHA:
/* replace RGBA with LLLA */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jL = IROUND(rgba[i][RCOMP] * scale);
GLint jA = IROUND(rgba[i][ACOMP] * scale);
GLfloat luminance = CHAN_TO_FLOAT(lut[jL * 2 + 0]);
GLfloat alpha = CHAN_TO_FLOAT(lut[jA * 2 + 1]);
GLfloat luminance, alpha;
jL = CLAMP(jL, 0, max);
jA = CLAMP(jA, 0, max);
luminance = CHAN_TO_FLOAT(lut[jL * 2 + 0]);
alpha = CHAN_TO_FLOAT(lut[jA * 2 + 1]);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
rgba[i][ACOMP] = alpha;;
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jL = IROUND(rgba[i][RCOMP] * scale);
GLint jA = IROUND(rgba[i][ACOMP] * scale);
GLfloat luminance = lut[jL * 2 + 0];
GLfloat alpha = lut[jA * 2 + 1];
GLfloat luminance, alpha;
jL = CLAMP(jL, 0, max);
jA = CLAMP(jA, 0, max);
luminance = lut[jL * 2 + 0];
alpha = lut[jA * 2 + 1];
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
rgba[i][ACOMP] = alpha;;
}
@ -983,26 +1001,34 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
case GL_RGB:
/* replace RGB with RGB */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jR = IROUND(rgba[i][RCOMP] * scale);
GLint jG = IROUND(rgba[i][GCOMP] * scale);
GLint jB = IROUND(rgba[i][BCOMP] * scale);
jR = CLAMP(jR, 0, max);
jG = CLAMP(jG, 0, max);
jB = CLAMP(jB, 0, max);
rgba[i][RCOMP] = CHAN_TO_FLOAT(lut[jR * 3 + 0]);
rgba[i][GCOMP] = CHAN_TO_FLOAT(lut[jG * 3 + 1]);
rgba[i][BCOMP] = CHAN_TO_FLOAT(lut[jB * 3 + 2]);
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jR = IROUND(rgba[i][RCOMP] * scale);
GLint jG = IROUND(rgba[i][GCOMP] * scale);
GLint jB = IROUND(rgba[i][BCOMP] * scale);
jR = CLAMP(jR, 0, max);
jG = CLAMP(jG, 0, max);
jB = CLAMP(jB, 0, max);
rgba[i][RCOMP] = lut[jR * 3 + 0];
rgba[i][GCOMP] = lut[jG * 3 + 1];
rgba[i][BCOMP] = lut[jB * 3 + 2];
@ -1012,7 +1038,8 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
case GL_RGBA:
/* replace RGBA with RGBA */
if (!table->FloatTable) {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
@ -1020,6 +1047,10 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
GLint jG = IROUND(rgba[i][GCOMP] * scale);
GLint jB = IROUND(rgba[i][BCOMP] * scale);
GLint jA = IROUND(rgba[i][ACOMP] * scale);
jR = CLAMP(jR, 0, max);
jG = CLAMP(jG, 0, max);
jB = CLAMP(jB, 0, max);
jA = CLAMP(jA, 0, max);
rgba[i][RCOMP] = CHAN_TO_FLOAT(lut[jR * 4 + 0]);
rgba[i][GCOMP] = CHAN_TO_FLOAT(lut[jG * 4 + 1]);
rgba[i][BCOMP] = CHAN_TO_FLOAT(lut[jB * 4 + 2]);
@ -1027,7 +1058,8 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
}
}
else {
const GLfloat scale = (GLfloat) (table->Size - 1);
const GLint max = table->Size - 1;
const GLfloat scale = (GLfloat) max;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
@ -1035,6 +1067,10 @@ _mesa_lookup_rgba(const struct gl_color_table *table,
GLint jG = IROUND(rgba[i][GCOMP] * scale);
GLint jB = IROUND(rgba[i][BCOMP] * scale);
GLint jA = IROUND(rgba[i][ACOMP] * scale);
jR = CLAMP(jR, 0, max);
jG = CLAMP(jG, 0, max);
jB = CLAMP(jB, 0, max);
jA = CLAMP(jA, 0, max);
rgba[i][RCOMP] = lut[jR * 4 + 0];
rgba[i][GCOMP] = lut[jG * 4 + 1];
rgba[i][BCOMP] = lut[jB * 4 + 2];