📄 pixel.c
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rgba[i][RCOMP] = (m[0] * r + m[4] * g + m[ 8] * b + m[12] * a) * rs + rb;
rgba[i][GCOMP] = (m[1] * r + m[5] * g + m[ 9] * b + m[13] * a) * gs + gb;
rgba[i][BCOMP] = (m[2] * r + m[6] * g + m[10] * b + m[14] * a) * bs + bb;
rgba[i][ACOMP] = (m[3] * r + m[7] * g + m[11] * b + m[15] * a) * as + ab;
}
}
/**
* Apply a color table lookup to an array of floating point RGBA colors.
*/
void
_mesa_lookup_rgba_float(const struct gl_color_table *table,
GLuint n, GLfloat rgba[][4])
{
if (!table->Table || table->Size == 0)
return;
switch (table->Format) {
case GL_INTENSITY:
/* replace RGBA with I */
if (table->Type == GL_FLOAT) {
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[CLAMP(j, 0, max)];
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
}
else {
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[CLAMP(j, 0, max)]);
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
}
break;
case GL_LUMINANCE:
/* replace RGB with L */
if (table->Type == GL_FLOAT) {
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[CLAMP(j, 0, max)];
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
else {
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[CLAMP(j, 0, max)]);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
break;
case GL_ALPHA:
/* replace A with A */
if (table->Type == GL_FLOAT) {
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[CLAMP(j, 0, max)];
}
}
else {
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[CLAMP(j, 0, max)]);
}
}
break;
case GL_LUMINANCE_ALPHA:
/* replace RGBA with LLLA */
if (table->Type == GL_FLOAT) {
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, 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;;
}
}
else {
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, 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;;
}
}
break;
case GL_RGB:
/* replace RGB with RGB */
if (table->Type == GL_FLOAT) {
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];
}
}
else {
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]);
}
}
break;
case GL_RGBA:
/* replace RGBA with RGBA */
if (table->Type == GL_FLOAT) {
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);
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];
rgba[i][ACOMP] = lut[jA * 4 + 3];
}
}
else {
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);
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]);
rgba[i][ACOMP] = CHAN_TO_FLOAT(lut[jA * 4 + 3]);
}
}
break;
default:
_mesa_problem(NULL, "Bad format in _mesa_lookup_rgba_float");
return;
}
}
/**
* Apply a color table lookup to an array of GLchan RGBA colors.
*/
void
_mesa_lookup_rgba_chan(const struct gl_color_table *table,
GLuint n, GLchan rgba[][4])
{
if (!table->Table || table->Size == 0)
return;
switch (table->Format) {
case GL_INTENSITY:
/* replace RGBA with I */
if (table->Type == GL_FLOAT) {
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
GLchan c;
CLAMPED_FLOAT_TO_CHAN(c, lut[j]);
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
}
else {
#if CHAN_TYPE == GL_UNSIGNED_BYTE
if (table->Size == 256) {
/* common case */
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
const GLchan c = lut[rgba[i][RCOMP]];
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = c;
}
}
else
#endif
{
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
rgba[i][RCOMP] = rgba[i][GCOMP] =
rgba[i][BCOMP] = rgba[i][ACOMP] = lut[j];
}
}
}
break;
case GL_LUMINANCE:
/* replace RGB with L */
if (table->Type == GL_FLOAT) {
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
GLchan c;
CLAMPED_FLOAT_TO_CHAN(c, lut[j]);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
else {
#if CHAN_TYPE == GL_UNSIGNED_BYTE
if (table->Size == 256) {
/* common case */
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
const GLchan c = lut[rgba[i][RCOMP]];
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = c;
}
}
else
#endif
{
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][RCOMP] * scale);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = lut[j];
}
}
}
break;
case GL_ALPHA:
/* replace A with A */
if (table->Type == GL_FLOAT) {
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][ACOMP] * scale);
GLchan c;
CLAMPED_FLOAT_TO_CHAN(c, lut[j]);
rgba[i][ACOMP] = c;
}
}
else {
#if CHAN_TYPE == GL_UNSIGNED_BYTE
if (table->Size == 256) {
/* common case */
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
rgba[i][ACOMP] = lut[rgba[i][ACOMP]];
}
}
else
#endif
{
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint j = IROUND((GLfloat) rgba[i][ACOMP] * scale);
rgba[i][ACOMP] = lut[j];
}
}
}
break;
case GL_LUMINANCE_ALPHA:
/* replace RGBA with LLLA */
if (table->Type == GL_FLOAT) {
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLfloat *lut = (const GLfloat *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jL = IROUND((GLfloat) rgba[i][RCOMP] * scale);
GLint jA = IROUND((GLfloat) rgba[i][ACOMP] * scale);
GLchan luminance, alpha;
CLAMPED_FLOAT_TO_CHAN(luminance, lut[jL * 2 + 0]);
CLAMPED_FLOAT_TO_CHAN(alpha, lut[jA * 2 + 1]);
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
rgba[i][ACOMP] = alpha;;
}
}
else {
#if CHAN_TYPE == GL_UNSIGNED_BYTE
if (table->Size == 256) {
/* common case */
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLchan l = lut[rgba[i][RCOMP] * 2 + 0];
GLchan a = lut[rgba[i][ACOMP] * 2 + 1];;
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = l;
rgba[i][ACOMP] = a;
}
}
else
#endif
{
const GLfloat scale = (GLfloat) (table->Size - 1) / CHAN_MAXF;
const GLchan *lut = (const GLchan *) table->Table;
GLuint i;
for (i = 0; i < n; i++) {
GLint jL = IROUND((GLfloat) rgba[i][RCOMP] * scale);
GLint jA = IROUND((GLfloat) rgba[i][ACOMP] * scale);
GLchan luminance = lut[jL * 2 + 0];
GLchan alpha = lut[jA * 2 + 1];
rgba[i][RCOMP] = rgba[i][GCOMP] = rgba[i][BCOMP] = luminance;
rgba[i][ACOMP] = alpha;
}
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