SkGLDevice::TexCache* SkGLDevice::setupGLPaintShader(const SkPaint& paint) {
SkGL::SetPaint(paint);
SkShader* shader = paint.getShader();
if (NULL == shader) {
return NULL;
}
if (!shader->setContext(this->accessBitmap(false), paint, this->matrix())) {
return NULL;
}
SkBitmap bitmap;
SkMatrix matrix;
SkShader::TileMode tileModes[2];
if (!shader->asABitmap(&bitmap, &matrix, tileModes)) {
return NULL;
}
bitmap.lockPixels();
if (!bitmap.readyToDraw()) {
return NULL;
}
// see if we've already cached the bitmap from the shader
SkPoint max;
GLuint name;
TexCache* cache = SkGLDevice::LockTexCache(bitmap, &name, &max);
// the lock has already called glBindTexture for us
SkGL::SetTexParams(paint.isFilterBitmap(), tileModes[0], tileModes[1]);
// since our texture coords will be in local space, we wack the texture
// matrix to map them back into 0...1 before we load it
SkMatrix localM;
if (shader->getLocalMatrix(&localM)) {
SkMatrix inverse;
if (localM.invert(&inverse)) {
matrix.preConcat(inverse);
}
}
matrix.postScale(max.fX / bitmap.width(), max.fY / bitmap.height());
glMatrixMode(GL_TEXTURE);
SkGL::LoadMatrix(matrix);
glMatrixMode(GL_MODELVIEW);
// since we're going to use a shader/texture, we don't want the color,
// just its alpha
SkGL::SetAlpha(paint.getAlpha());
// report that we have setup the texture
return cache;
}
void SkGLDevice::drawVertices(const SkDraw& draw, SkCanvas::VertexMode vmode,
int vertexCount, const SkPoint vertices[],
const SkPoint texs[], const SkColor colors[],
SkXfermode* xmode,
const uint16_t indices[], int indexCount,
const SkPaint& paint) {
if (false) {
SkRect bounds;
SkIRect ibounds;
bounds.set(vertices, vertexCount);
bounds.round(&ibounds);
SkDebugf("---- drawverts: %d pts, texs=%d colors=%d indices=%d bounds [%d %d]\n",
vertexCount, texs!=0, colors!=0, indexCount, ibounds.width(), ibounds.height());
}
SkGLClipIter* iter = this->updateMatrixClip();
SkGL::SetPaint(paint);
const SkGLVertex* glVerts;
const SkGLVertex* glTexs = NULL;
#if GLSCALAR_IS_SCALAR
glVerts = (const SkGLVertex*)vertices;
#else
SkAutoSTMalloc<32, SkGLVertex> storage(vertexCount);
storage.get()->setPoints(vertices, vertexCount);
glVerts = storage.get();
#endif
uint8_t* colorArray = NULL;
if (colors) {
colorArray = (uint8_t*)sk_malloc_throw(vertexCount*4);
SkGL::SetRGBA(colorArray, colors, vertexCount);
}
SkAutoFree afca(colorArray);
SkGLVertex* texArray = NULL;
TexCache* cache = NULL;
if (texs && paint.getShader()) {
SkShader* shader = paint.getShader();
// if (!shader->setContext(this->accessBitmap(), paint, *draw.fMatrix)) {
if (!shader->setContext(*draw.fBitmap, paint, *draw.fMatrix)) {
goto DONE;
}
SkBitmap bitmap;
SkMatrix matrix;
SkShader::TileMode tileModes[2];
if (shader->asABitmap(&bitmap, &matrix, tileModes)) {
SkPoint max;
GLuint name;
cache = SkGLDevice::LockTexCache(bitmap, &name, &max);
if (NULL == cache) {
return;
}
matrix.postScale(max.fX / bitmap.width(), max.fY / bitmap.height());
glMatrixMode(GL_TEXTURE);
SkGL::LoadMatrix(matrix);
glMatrixMode(GL_MODELVIEW);
#if GLSCALAR_IS_SCALAR
glTexs = (const SkGLVertex*)texs;
#else
texArray = (SkGLVertex*)sk_malloc_throw(vertexCount * sizeof(SkGLVertex));
texArray->setPoints(texs, vertexCount);
glTexs = texArray;
#endif
SkGL::SetPaintAlpha(paint);
SkGL::SetTexParams(paint.isFilterBitmap(),
tileModes[0], tileModes[1]);
}
}
DONE:
SkAutoFree aftex(texArray);
SkGL::DrawVertices(indices ? indexCount : vertexCount,
gVertexModeToGL[vmode],
glVerts, glTexs, colorArray, indices, iter);
if (cache) {
SkGLDevice::UnlockTexCache(cache);
}
}
